UDR


Line plots across dimensions of each concept
Line plots across concepts
Tables

Table of contents



us-gaap:CommonStockValue
us-gaap:StatementClassOfStock
us-gaap:SharesIssued

us-gaap:CommonStockSharesIssued
us-gaap:StatementClassOfStock
us-gaap:PreferredStockSharesIssued

us-gaap:CommonStockSharesAuthorized
us-gaap:SubsidiarySaleOfStock

us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:IncomeStatementLocation

us-gaap:ComprehensiveIncomeNetOfTax
dei:LegalEntity

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
dei:LegalEntity

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
dei:LegalEntity

us-gaap:CostsAndExpenses
dei:LegalEntity
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:GainLossOnInvestments

us-gaap:GainsLossesOnExtinguishmentOfDebt
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:GeneralAndAdministrativeExpense
dei:LegalEntity

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxesPaidNet

us-gaap:InterestExpense
dei:LegalEntity

us-gaap:InterestExpenseDebt
dei:LegalEntity
dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:InterestPaidNet
dei:LegalEntity

us-gaap:NetIncomeLoss
dei:LegalEntity
us-gaap:StatementEquityComponents

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:OperatingIncomeLoss
dei:LegalEntity
dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:OtherComprehensiveIncomeLossNetOfTax
dei:LegalEntity

us-gaap:OtherNonoperatingIncomeExpense
dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:PreferredStockDividendsIncomeStatementImpact
us-gaap:StatementEquityComponents

us-gaap:ProfitLoss
dei:LegalEntity
dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:Revenues
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:Assets
dei:LegalEntity
dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:Liabilities
dei:LegalEntity
dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:LiabilitiesAndStockholdersEquity
dei:LegalEntity

us-gaap:StockholdersEquity

us-gaap:CashAndCashEquivalentsAtCarryingValue
dei:LegalEntity
dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
dei:LegalEntity

us-gaap:Land
dei:LegalEntity

us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:OperatingLeaseRightOfUseAsset
dei:LegalEntity

us-gaap:OtherAssets
dei:LegalEntity
dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:LiabilitiesNoncurrent

us-gaap:LongTermDebt
dei:LegalEntity
dei:LegalEntity, us-gaap:DebtInstrument
us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

us-gaap:MinorityInterest
dei:LegalEntity
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType
dei:LegalEntity
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType
dei:LegalEntity
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType
dei:LegalEntity
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType
dei:LegalEntity
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:OperatingLeaseLiability
dei:LegalEntity
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType
dei:LegalEntity
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType
dei:LegalEntity
us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:StockholdersEquity

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:CumulativeEffectPeriodOfAdoption, us-gaap:AdjustmentsForNewAccountingPronouncements
us-gaap:CumulativeEffectPeriodOfAdoption, us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:StatementEquityComponents
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapital

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
dei:LegalEntity

us-gaap:MinorityInterest

us-gaap:StockIssuedDuringPeriodValueNewIssues
us-gaap:StatementEquityComponents
us-gaap:SubsidiarySaleOfStock

us-gaap:NetCashProvidedByUsedInOperatingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInInvestingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInFinancingActivities
dei:LegalEntity

us-gaap:AmortizationOfFinancingCosts
us-gaap:IncomeStatementLocation

us-gaap:DepreciationDepletionAndAmortization
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInOperatingActivities
dei:LegalEntity

us-gaap:NetIncomeLoss
dei:LegalEntity
us-gaap:StatementEquityComponents

us-gaap:ProfitLoss
dei:LegalEntity
dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInFinancingActivities
dei:LegalEntity

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock
dei:LegalEntity, us-gaap:LongtermDebtType
us-gaap:DebtInstrumentInterestRateStatedPercentage
dei:LegalEntity, us-gaap:LongtermDebtType, us-gaap:TypeOfArrangement
us-gaap:DebtInstrument
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:RealEstateProperties
us-gaap:LongtermDebtType
us-gaap:LongtermDebtType, us-gaap:TypeOfArrangement
us-gaap:RealEstateProperties, us-gaap:SubsequentEventType
us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DeferredTaxLiabilities
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:DeferredTaxAssetsNet
us-gaap:ConsolidatedEntities
us-gaap:DeferredTaxAssetsValuationAllowance

udr:AdjustmentToProfitLossCovid19Pandemic

udr:AdjustmentToRentalIncomeCovid19Pandemic
dei:LegalEntity
dei:LegalEntity, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment
udr:AmountOfPrivateOrPublicCapitalThatMustBeRaisedForNoteReceivableToMature

udr:CasualtyRelatedRecoveriesChargesNet
dei:LegalEntity
us-gaap:LongtermDebtType
udr:DebtInstrumentRedemptionExpensesIncurred

udr:DevelopmentCostsExcludingDirectCostsAndCapitalizedInterest
dei:LegalEntity
us-gaap:SubsidiarySaleOfStock
udr:ForwardPricePerShare
us-gaap:SubsidiarySaleOfStock
udr:ForwardSalesAgreementCommonStockCapitalSharesReservedForFutureIssuance

udr:IncomeFromParticipatingLoan
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:IncomeTaxExpenseBenefitOfReitSubsidiaryNetIncludingDiscontinuedOperations

udr:InterestAndOtherIncomeIncludingDiscontinuedOperations
us-gaap:LimitedPartnersCapitalAccountByClass
udr:LimitedPartnersCapitalAccountUnitDividendRatePercentage
us-gaap:LimitedPartnersCapitalAccountByClass
udr:LimitedPartnersCapitalAccountUnitValue1
dei:LegalEntity, us-gaap:LongtermDebtType
udr:LongTermDebtPriceAsPercentageOfPrincipalAmount
us-gaap:DebtInstrument
us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
dei:LegalEntity
udr:LongTermIncentivePlanOperatingPartnershipUnitGrantsValue
dei:LegalEntity, us-gaap:PartnerCapitalComponents
dei:LegalEntity, us-gaap:PartnerTypeOfPartnersCapitalAccount

udr:LongTermIncentivePlanOperatingPartnershipUnitVestingValue

udr:LongTermIncentivePlanOperatingPartnershipUnitsVestingShares
us-gaap:PartnerTypeOfPartnersCapitalAccount

udr:LongTermIncentivePlanUnitGrantsVestingsNet
us-gaap:StatementEquityComponents
dei:LegalEntity
udr:NonCashLongTermIncentivePlanOperatingPartnershipUnitGrantsValue

udr:NotesReceivableCancellation
us-gaap:FinancingReceivablePortfolioSegment
udr:NotesReceivableIncrease

udr:OperatingLeaseLiabilitiesAmortization
dei:LegalEntity
dei:LegalEntity, us-gaap:StatementBusinessSegments
udr:OperatingLeaseOtherIncome
us-gaap:StatementBusinessSegments

udr:OperatingLeaseRightOfUseAssetAmortization
dei:LegalEntity
dei:LegalEntity, us-gaap:PartnerTypeOfPartnersCapitalAccount
udr:OperatingPartnershipUnitRedemptionsForCommonSharesOfParentCompany

udr:OtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents

udr:OtherCostAndExpenseOperatingIncludingDiscontinuedOperations
dei:LegalEntity

udr:OtherGeneralAndAdministrativeExpenseIncludingDiscontinuedOperations
dei:LegalEntity

udr:PaymentsForDepositsOnPendingAcquisitions
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
udr:PercentageOfRevenueTotalLeaseRevenue
us-gaap:PropertyPlantAndEquipmentByType

udr:PropertyManagementCostsOperating
dei:LegalEntity
dei:LegalEntity
udr:RecognitionOfOperatingLeaseRightOfUseAssets
us-gaap:RelatedPartyTransactionsByRelatedParty
udr:RelatedPartyTransactionManagementFeePercentage
dei:LegalEntity
udr:RelatedPartyTransactionManagementFees
us-gaap:Ownership
udr:RentalRevenuesPercentOfParentRentalRevenue

udr:ReturnOnInvestmentInEquityMethodInvestments
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
udr:SecuredDebtRefinancedAmount
dei:LegalEntity, us-gaap:StatementBusinessSegments
udr:SegmentReportingInformationNetOperatingIncome
us-gaap:StatementBusinessSegments

udr:SegmentReportingReconcilingItemsCostOfServicesDepreciationAndAmortization
dei:LegalEntity

udr:SegmentReportingReconcilingItemsOwnedPropertyManagementCosts
dei:LegalEntity

udr:StockRepurchaseProgramWeightedAveragePricePerShare
us-gaap:SubsidiarySaleOfStock
udr:WeightedAverageSharePrice
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease
us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:AmortizationOfDebtDiscountPremium
us-gaap:LongtermDebtType

us-gaap:CapitalExpendituresIncurredButNotYetPaid
dei:LegalEntity

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect
dei:LegalEntity
us-gaap:StatementEquityComponents
us-gaap:ConversionOfStockAmountConverted1

us-gaap:ConversionOfStockAmountIssued1

us-gaap:DebtInstrumentInterestRateDuringPeriod
dei:LegalEntity
dei:LegalEntity, us-gaap:DebtInstrument
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrument
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
us-gaap:Range, us-gaap:LongtermDebtType

us-gaap:DepreciationAndAmortization

us-gaap:DepreciationNonproduction
dei:LegalEntity
dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation
us-gaap:DerivativeGainLossOnDerivativeNet

us-gaap:DirectCostsOfLeasedAndRentedPropertyOrEquipment
dei:LegalEntity
dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:DistributionsOnMandatorilyRedeemableSecurities

us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents

us-gaap:DividendsPreferredStock
dei:LegalEntity, us-gaap:LongtermDebtType
us-gaap:ExtinguishmentOfDebtAmount
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

us-gaap:GainLossOnSaleOfInvestments

us-gaap:GainsLossesOnSalesOfInvestmentRealEstate
dei:LegalEntity, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
dei:LegalEntity, us-gaap:RealEstateProperties
us-gaap:RealEstateProperties
us-gaap:RealEstateProperties, us-gaap:SubsequentEventType
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType
dei:LegalEntity
us-gaap:IncomeLossAttributableToNoncontrollingInterest
dei:LegalEntity
us-gaap:IncomeLossAttributableToParent

us-gaap:IncomeLossFromEquityMethodInvestments
dei:LegalEntity
dei:LegalEntity
us-gaap:IncomeLossIncludingPortionAttributableToNoncontrollingInterest
dei:LegalEntity, us-gaap:PartnerCapitalComponents
dei:LegalEntity, us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:IncreaseDecreaseInOperatingAssets
dei:LegalEntity

us-gaap:IncreaseDecreaseInOperatingLiabilities
dei:LegalEntity

us-gaap:IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InterestCostsIncurredCapitalized
dei:LegalEntity
dei:LegalEntity, us-gaap:Range
dei:LegalEntity
us-gaap:InterestExpenseRelatedParty
dei:LegalEntity
us-gaap:LeaseCost
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:IncomeStatementLocation, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityAverageOutstandingAmount
us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityCommitmentFeePercentage
us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityInterestRateDuringPeriod
us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod
us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
us-gaap:LongTermDebtWeightedAverageInterestRateOverTime
us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

us-gaap:MinorityInterestChangeInRedemptionValue
us-gaap:StatementEquityComponents

us-gaap:MinorityInterestDecreaseFromRedemptions
us-gaap:StatementEquityComponents
dei:LegalEntity
us-gaap:MinorityInterestPeriodIncreaseDecrease
dei:LegalEntity, us-gaap:PartnerCapitalComponents

us-gaap:NetIncomeLossAttributableToNonredeemableNoncontrollingInterest
us-gaap:StatementEquityComponents

us-gaap:NetIncomeLossAttributableToRedeemableNoncontrollingInterest
dei:LegalEntity
us-gaap:NetIncomeLossPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicAndDiluted

us-gaap:NoncashOrPartNoncashAcquisitionDebtAssumed1

us-gaap:NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsNonredeemable
dei:LegalEntity

us-gaap:OperatingLeaseCost
dei:LegalEntity
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:Range

us-gaap:OperatingLeaseLeaseIncome
dei:LegalEntity
dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
dei:LegalEntity, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments
dei:LegalEntity, us-gaap:StatementBusinessSegments
us-gaap:OperatingLeaseLeaseIncomeLeasePayments
us-gaap:StatementBusinessSegments

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax
dei:LegalEntity
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest

us-gaap:OtherCostAndExpenseOperating
dei:LegalEntity

us-gaap:OtherDepreciationAndAmortization

us-gaap:OtherInterestAndDividendIncome

us-gaap:OtherOperatingActivitiesCashFlowStatement
dei:LegalEntity
dei:LegalEntity
us-gaap:PartnersCapitalAccountDistributions
dei:LegalEntity, us-gaap:PartnerCapitalComponents
dei:LegalEntity, us-gaap:PartnerTypeOfPartnersCapitalAccount
dei:LegalEntity, us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:PartnersCapitalAccountRedemptions
dei:LegalEntity, us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:PartnersCapitalAccountUnitsRedeemed
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:PaymentsForCapitalImprovements
dei:LegalEntity

us-gaap:PaymentsForProceedsFromLoansReceivable
us-gaap:SubsidiarySaleOfStock
us-gaap:PaymentsForUnderwritingExpense
dei:LegalEntity
us-gaap:PaymentsOfCapitalDistribution

us-gaap:PaymentsOfDebtExtinguishmentCosts
dei:LegalEntity, us-gaap:LongtermDebtType, us-gaap:TypeOfArrangement
us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:IncomeStatementLocation, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:IncomeStatementLocation, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
us-gaap:LongtermDebtType, us-gaap:TypeOfArrangement
us-gaap:Range, us-gaap:LongtermDebtType

us-gaap:PaymentsOfDividendsMinorityInterest

us-gaap:PaymentsOfDividendsPreferredStockAndPreferenceStock

us-gaap:PaymentsToAcquireBuildings
us-gaap:RealEstateProperties
us-gaap:PaymentsToAcquireBusinessesGross

us-gaap:PaymentsToAcquireEquityMethodInvestments

us-gaap:PaymentsToAcquireFurnitureAndFixtures

us-gaap:PaymentsToAcquireInterestInSubsidiariesAndAffiliates

us-gaap:PaymentsToDevelopRealEstateAssets
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:SubsequentEventType
us-gaap:ProceedsFromCollectionOfNotesReceivable

us-gaap:ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
dei:LegalEntity
us-gaap:SubsidiarySaleOfStock
us-gaap:ProceedsFromIssuanceOfCommonStock

us-gaap:ProceedsFromIssuanceOfSecuredDebt

us-gaap:ProceedsFromIssuanceOfUnsecuredDebt

us-gaap:ProceedsFromLeasePayments
dei:LegalEntity
us-gaap:ProceedsFromPaymentsForLongTermLoansForRelatedParties

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities
dei:LegalEntity

us-gaap:ProceedsFromRepaymentsOfCommercialPaper

us-gaap:ProceedsFromRepaymentsOfLinesOfCredit
us-gaap:RealEstateProperties
us-gaap:ProceedsFromSaleOfRealEstate
us-gaap:RealEstateProperties, us-gaap:SubsequentEventType
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType
us-gaap:StatementScenario, us-gaap:RealEstateProperties

us-gaap:ProceedsFromSaleOfRealEstateHeldforinvestment
dei:LegalEntity, us-gaap:RealEstateProperties
us-gaap:PropertyPlantAndEquipmentAdditions
us-gaap:RealEstateProperties
us-gaap:RealEstateProperties, us-gaap:SubsequentEventType

us-gaap:ProvisionForLoanLeaseAndOtherLosses
us-gaap:Range
us-gaap:ProvisionForLoanLossesExpensed

us-gaap:RealEstateTaxesAndInsurance
dei:LegalEntity
dei:LegalEntity, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:RepaymentsOfDebt
us-gaap:LongtermDebtType

us-gaap:RepaymentsOfSecuredDebt

us-gaap:RepaymentsOfUnsecuredDebt

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
us-gaap:DebtInstrument
us-gaap:ShortTermDebtWeightedAverageInterestRateOverTime
us-gaap:LongtermDebtType
us-gaap:DebtInstrument
us-gaap:ShorttermDebtAverageOutstandingAmount
us-gaap:DebtInstrument
us-gaap:ShorttermDebtMaximumAmountOutstandingDuringPeriod
us-gaap:SubsidiarySaleOfStock
us-gaap:StockIssuedDuringPeriodSharesNewIssues

us-gaap:StockIssuedDuringPeriodValueConversionOfUnits
us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
us-gaap:StatementEquityComponents

us-gaap:StockRepurchasedDuringPeriodShares

us-gaap:StockRepurchasedDuringPeriodValue
us-gaap:StatementEquityComponents

us-gaap:TransferToOtherRealEstate
dei:LegalEntity
us-gaap:UnrealizedGainLossOnDerivatives
dei:LegalEntity, us-gaap:PartnerCapitalComponents

us-gaap:VariableLeaseCost
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
dei:LegalEntity, us-gaap:Range, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:Range
dei:LegalEntity
us-gaap:WeightedAverageNumberOfLimitedPartnershipAndGeneralPartnershipUnitOutstandingBasicAndDiluted

us-gaap:WeightedAverageNumberOfSharesIssuedBasic

srt:RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
dei:LegalEntity
dei:LegalEntity, us-gaap:StatementGeographical
us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:StatementGeographical
us-gaap:StatementGeographical

srt:RealEstateFederalIncomeTaxBasis
dei:LegalEntity

udr:AccumulatedDepreciationOfRealEstateHeldForSale
dei:LegalEntity
us-gaap:FinancingReceivablePortfolioSegment
udr:AggregateCommitmentOnNoteReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:SubsequentEventType
us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
udr:CommercialPaperMaximumBorrowingAmount

udr:CostIncurredToDate
dei:LegalEntity, us-gaap:RealEstateProperties
us-gaap:RealEstateProperties
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:LongtermDebtType
udr:DebtInstrumentRedeemedValue

udr:DebtInstrumentUnamortizedFairMarketValueAdjustmentDiscountPremiumDeferredFinancingCost
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
dei:LegalEntity, us-gaap:LongtermDebtType, us-gaap:TypeOfArrangement
udr:DebtInstrumentsTenderedPercent
us-gaap:LongtermDebtType, us-gaap:TypeOfArrangement
dei:LegalEntity, us-gaap:LongtermDebtType, us-gaap:TypeOfArrangement
udr:DebtTenderedValue
us-gaap:ConsolidatedEntities
udr:DeferredTaxAssetsFederalAndStateTaxAttributes
us-gaap:RealEstateProperties
udr:DepositOnPurchaseCommitment
dei:LegalEntity, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
udr:DisposalGroupIncludingDiscontinuedOperationGrossConsideration
dei:LegalEntity, us-gaap:RealEstateProperties
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
udr:EquityMethodInvestmentCommittedInvestment
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
udr:EquityMethodInvestmentSummarizedFinancialInformationAssetsHeldForDisposition
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
udr:EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesHeldForDisposition
dei:LegalEntity, us-gaap:Ownership
udr:GeneralPartnersCapitalAccountUnitsOwnedPercentage

udr:InvestmentBuildingAndBuildingImprovementsAndFurnitureFixturesAndEquipment
dei:LegalEntity

udr:InvestmentsOnDevelopmentCommunities
dei:LegalEntity
udr:LesseeOperatingLeaseLiabilityToBePaidInYearFiveAndAfterYearFive
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
udr:LessorOperatingLeasePaymentToBeReceivedInFifthYearAndAfterYearFive
us-gaap:PropertyPlantAndEquipmentByType
dei:LegalEntity
udr:LimitedPartnersCapitalAccountUnitsOutstandingPercentage
dei:LegalEntity, us-gaap:Ownership
dei:LegalEntity, us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:Ownership
us-gaap:LongtermDebtType
udr:LineOfCreditFacilityAdjustedMaximumBorrowingCapacity

udr:LongTermDebtMaturitiesRepaymentOfPrincipleInYearEight
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

udr:LongTermDebtMaturitiesRepaymentOfPrincipleInYearNine
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

udr:LongTermDebtMaturitiesRepaymentOfPrincipleInYearSeven
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

udr:LongTermDebtMaturitiesRepaymentOfPrincipleInYearSix
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

udr:LongTermDebtMaturitiesRepaymentOfPrincipleInYearTen
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

udr:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearNine
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

udr:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearTen
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
us-gaap:FinancingReceivablePortfolioSegment
udr:NoteReceivableInterestRate

udr:NumberOfApartmentHomesOwnedAndConsolidatedByCompany
dei:LegalEntity
dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:NumberOfMarketsOperatingWithin
dei:LegalEntity
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
udr:ParticipatingLoanInterestRateStatedPercentage
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:StatementScenario
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType
dei:LegalEntity, us-gaap:Ownership
udr:Percentageoftotaloutstandingoperatingpartnershipunitsrepresentedbygeneralpartnershipunitsoutstanding
us-gaap:DebtInstrument
udr:PortionOfMediumTermNoteSubjectToInterestRateSwaps
us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
udr:PriceOfDebtInstrumentAsPercentageOfPrincipalAmountOfIssuance
us-gaap:LongtermDebtType
us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

udr:RealEstateAndAccumulatedDepreciationInitialCostOfLandAndBuildingsAndImprovements

udr:RealEstateHeldForInvestmentNetExcludingRealEstateUnderDevelopmentOrHeldForDisposition
dei:LegalEntity

udr:RealEstateHeldForSaleNetofDepreciation
dei:LegalEntity

udr:RealEstateOwnedAccumulatedAmortizationIntangibleAssets

udr:RealEstateOwnedGross
dei:LegalEntity
dei:LegalEntity, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

udr:RealEstateUnderDevelopmentAccumulatedDepreciation

udr:RealEstatesOwnedAccumulatedDepreciation
dei:LegalEntity

udr:SecuredDebtEncumbersRealEstateOwnedAmount

udr:SecuredDebtEncumbersRealEstateOwnedPercent
dei:LegalEntity
udr:SecuredDebtIncludingDebtOnRealEstateHeldForSale
dei:LegalEntity, us-gaap:DebtInstrument
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
dei:LegalEntity, us-gaap:LongtermDebtType, us-gaap:TypeOfArrangement
us-gaap:DebtInstrument
us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:FairValueByLiabilityClass
us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:FairValueByLiabilityClass
us-gaap:LongtermDebtType
us-gaap:LongtermDebtType, us-gaap:TypeOfArrangement
us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

udr:SecuredDebtUnencumberedRealEstateOwnedAmount

udr:SecuredDebtUnencumberedRealEstateOwnedPercent
us-gaap:AwardType
udr:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIssued
dei:LegalEntity, us-gaap:LongtermDebtType, us-gaap:TypeOfArrangement
udr:TenderOfferAmountPerPrincipalAmount
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
udr:UnsecuredDebtInstrumentsFairValue
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent
dei:LegalEntity

us-gaap:AccumulatedDistributionsInExcessOfNetIncome

us-gaap:AdvanceRent
dei:LegalEntity
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:AssetsFairValueDisclosure
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
dei:LegalEntity, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
dei:LegalEntity, us-gaap:RealEstateProperties
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
us-gaap:RealEstateProperties

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
dei:LegalEntity, us-gaap:RealEstateProperties
us-gaap:RealEstateProperties
us-gaap:DebtInstrument
us-gaap:CommercialPaperAtCarryingValue
us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:StatementClassOfStock
us-gaap:CommonStockCapitalSharesReservedForFutureIssuance
us-gaap:SubsidiarySaleOfStock

us-gaap:DebtInstrumentCarryingAmount
us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:RealEstateProperties
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
us-gaap:RealEstateProperties
us-gaap:RealEstateProperties, us-gaap:SubsequentEventType
us-gaap:DebtInstrument
us-gaap:DebtInstrumentFaceAmount
us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:DebtInstrumentFairValue
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dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
dei:LegalEntity, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
dei:LegalEntity, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
dei:LegalEntity, us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:LongtermDebtType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:LongtermDebtType
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:LongtermDebtType
dei:LegalEntity
us-gaap:DebtInstrumentInterestRateEffectivePercentage
dei:LegalEntity, us-gaap:DebtInstrument
us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:Range, us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass
us-gaap:Range, us-gaap:DebtInstrument, us-gaap:FinancialInstrument
us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrumentUnamortizedDiscount
us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:FairValueByLiabilityClass
us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet
us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentUnamortizedPremium
us-gaap:LongtermDebtType
us-gaap:RealEstateProperties

us-gaap:DebtWeightedAverageInterestRate
us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:FinancialInstrument
us-gaap:LongtermDebtType
dei:LegalEntity
us-gaap:DeferredFinanceCostsNet
dei:LegalEntity, us-gaap:DebtInstrument
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

us-gaap:DeferredGainOnSaleOfProperty
us-gaap:ConsolidatedEntities
us-gaap:DeferredIncomeTaxLiabilities
us-gaap:ConsolidatedEntities
us-gaap:DeferredTaxAssetsGross
us-gaap:ConsolidatedEntities
us-gaap:DeferredTaxAssetsOther
us-gaap:ConsolidatedEntities
us-gaap:DeferredTaxLiabilitiesInvestments
us-gaap:ConsolidatedEntities
us-gaap:DeferredTaxLiabilitiesOther
us-gaap:ConsolidatedEntities
us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DerivativeAssets
us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:DerivativeAverageFixedInterestRate
us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
dei:LegalEntity, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
dei:LegalEntity, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
dei:LegalEntity, us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral

us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByLiabilityClass, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral
dei:LegalEntity, us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue

us-gaap:DerivativeLiabilities
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeNotionalAmount

us-gaap:DevelopmentInProcess
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:DividendsPayableCurrentAndNoncurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:DueFromRelatedParties
us-gaap:AwardType
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentOwnershipPercentage

us-gaap:EquityMethodInvestments
dei:LegalEntity
dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:BalanceSheetLocation, us-gaap:InvestmentType
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:BalanceSheetLocation

us-gaap:FinancingReceivableAllowanceForCreditLosses

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
dei:LegalEntity
us-gaap:GeneralPartnersCapitalAccount
dei:LegalEntity
us-gaap:GeneralPartnersCapitalAccountUnitsOutstanding
dei:LegalEntity, us-gaap:Ownership
dei:LegalEntity, us-gaap:LongtermDebtType
us-gaap:GuaranteeObligationsMaximumExposure

us-gaap:InterestPayableCurrentAndNoncurrent
dei:LegalEntity
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet
us-gaap:StatementScenario

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesFairValueDisclosure
dei:LegalEntity

us-gaap:LandImprovements
dei:LegalEntity
dei:LegalEntity
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType
dei:LegalEntity
us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LessorOperatingLeasePaymentsToBeReceived
dei:LegalEntity
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LessorOperatingLeasePaymentsToBeReceivedFiveYears
dei:LegalEntity

us-gaap:LessorOperatingLeasePaymentsToBeReceivedFourYears
dei:LegalEntity
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths
dei:LegalEntity
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThereafter
dei:LegalEntity

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThreeYears
dei:LegalEntity
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LessorOperatingLeasePaymentsToBeReceivedTwoYears
dei:LegalEntity
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:LiabilitiesFairValueDisclosure
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
dei:LegalEntity, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation
dei:LegalEntity
us-gaap:LimitedPartnersCapitalAccount

us-gaap:LimitedPartnersCapitalAccountUnitsOutstanding
dei:LegalEntity
dei:LegalEntity, us-gaap:LimitedPartnersCapitalAccountByClass
dei:LegalEntity, us-gaap:Ownership
dei:LegalEntity, us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:LimitedPartnersCapitalAccountByClass, us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:Ownership
us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LineOfCredit
dei:LegalEntity, us-gaap:DebtInstrument
dei:LegalEntity, us-gaap:LongtermDebtType
us-gaap:DebtInstrument
us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityInterestRateAtPeriodEnd
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:DebtInstrument
us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
us-gaap:DebtInstrument
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
us-gaap:DerivativeInstrumentRisk, us-gaap:SubsequentEventType
us-gaap:LineOfCreditFacility
us-gaap:LongtermDebtType
dei:LegalEntity, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:LoansAndLeasesReceivableAllowance
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:Range, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:DebtInstrument, us-gaap:RealEstateProperties
us-gaap:LongTermDebtFairValue
us-gaap:FinancialInstrument

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType
us-gaap:MediumTermNotes
us-gaap:LongtermDebtType
dei:LegalEntity
us-gaap:NotesPayableRelatedPartiesCurrentAndNoncurrent
dei:LegalEntity, us-gaap:DebtInstrument

us-gaap:NotesReceivableGross
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:SubsequentEventType

us-gaap:NotesReceivableNet
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:NumberOfRealEstateProperties
dei:LegalEntity
dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:NumberOfStatesInWhichEntityOperates
dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:NumberOfUnitsInRealEstateProperty
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
dei:LegalEntity
us-gaap:IncomeTaxAuthority
us-gaap:OperatingLossCarryforwards
dei:LegalEntity
us-gaap:PartnersCapital

us-gaap:PartnersCapitalAccountUnits
dei:LegalEntity
dei:LegalEntity, us-gaap:Ownership
dei:LegalEntity
us-gaap:PartnersCapitalAttributableToNoncontrollingInterest
dei:LegalEntity
us-gaap:PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
dei:LegalEntity, us-gaap:PartnerCapitalComponents
dei:LegalEntity, us-gaap:PartnerTypeOfPartnersCapitalAccount
dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:StatementClassOfStock
us-gaap:PreferredStockLiquidationPreference
us-gaap:StatementClassOfStock
us-gaap:PreferredStockSharesOutstanding
us-gaap:StatementClassOfStock
us-gaap:PreferredStockValue
us-gaap:StatementClassOfStock
us-gaap:PreferredStockValueOutstanding

us-gaap:PurchaseCommitmentRemainingMinimumAmountCommitted
dei:LegalEntity, us-gaap:RealEstateProperties
us-gaap:RealEstateProperties
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:RealEstateProperties
us-gaap:PurchaseObligation

us-gaap:RealEstateAccumulatedDepreciation

us-gaap:RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements

us-gaap:RealEstateAndAccumulatedDepreciationCarryingAmountOfLand

us-gaap:RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements

us-gaap:RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements

us-gaap:RealEstateAndAccumulatedDepreciationInitialCostOfLand

us-gaap:RealEstateGrossAtCarryingValue
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:RealEstateHeldforsale
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:RealEstateInvestmentPropertyAccumulatedDepreciation
dei:LegalEntity
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:RealEstateInvestmentPropertyAtCost
dei:LegalEntity

us-gaap:RealEstateInvestmentPropertyNet
dei:LegalEntity
dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:RedeemableNoncontrollingInterestEquityCarryingAmount

us-gaap:RedeemableNoncontrollingInterestEquityCommonCarryingAmount
dei:LegalEntity
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:RestrictedCashAndCashEquivalents
dei:LegalEntity

us-gaap:SecuredDebt
dei:LegalEntity
dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:LongtermDebtType
us-gaap:SeniorNotes
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

us-gaap:UnsecuredDebt
us-gaap:LongtermDebtType

Plots across concepts


IncomeStatement
Other Comprehensive Income Loss Net Of Tax
Expenses
Allocated Share Based Compensation Expense
Balance Sheet
Cash And Cash Equivalents At Carrying Value
Assets
Derivative Assets
Current Assets
Cash And Cash Equivalents At Carrying Value
NonCurrent Assets
Finite Lived Intangible Assets Net
Liabilities
Derivative Liabilities
Noncurrent Liabilities
Minority Interest
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
CashFlow
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInOperatingActivities
Share Based Compensation
NetCashProvidedByUsedInFinancingActivities
Proceeds From Payments For Other Financing Activities
Shares
Common Stock Shares Issued
DividendsAndRepurchase
Payments For Repurchase Of Common Stock

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:CommonStockValue ████████▇▇▇▆▆▆▆▆▆▆▆▆▆▆▅▅▅▅▅▅▅▅▅▅▅▄▃▃▂▁▁2.9682.9682.9662.9452.9512.9492.9462.9292.8312.8182.7552.6842.6772.6762.6782.6762.6762.6742.6182.622.5912.592.5512.5522.5152.5142.5072.5072.5072.5072.5012.5012.5022.282.1972.191.9671.8731.825NANANA
 us-gaap:SharesIssued us-gaap:StatementClassOfStock us-gaap:CommonStockNANA296.612NANANA294.588NANANA275.5459NANANA267.822069NANANA261.844521NANANA255.114603NANANANANANANANANANANANA219.038784196.660518187.273833182.49633NANANA
 us-gaap:SharesIssued us-gaap:StatementClassOfStock us-gaap:SeriesEPreferredStockNANA2.695NANANA2.781NANANA2.780994NANANA2.780994NANANA2.796903NANANA2.803812NANANANANANANANANANANANANANANANANANANA
 us-gaap:SharesIssued us-gaap:StatementClassOfStock us-gaap:SeriesFPreferredStockNANA14.441NANANA14.691NANANA15.802393NANANA15.852721NANANA16.452496NANANA2.464183NANANANANANANANANANANANANANANANANANANA
us-gaap:CommonStockSharesIssued NANANA294.479942295.067779294.881038294.588305292.948423283.104643281.791932275.5459268.390557267.667437267.583892267.822069267.599391267.557894267.398819261.844521NANANA255.114603255.215905251.49242251.430708250.749665250.743021250.742325250.741559250.139408250.136597250.205424227.967573219.650225219.038779196.660518187.273833182.49633NANANA
 us-gaap:PreferredStockSharesIssued us-gaap:StatementClassOfStock us-gaap:SeriesEPreferredStockNANANA2.6953632.6953632.7809942.7809942.7809942.7809942.7809942.7809942.7809942.7809942.7809942.7809942.7809942.7969032.7969032.796903NANANA2.8038122.8038122.8038122.8038122.8038122.8038122.8038122.8038122.8038122.8038122.8038122.8038122.803812NANANA2.803812NANANA
 us-gaap:PreferredStockSharesIssued us-gaap:StatementClassOfStock us-gaap:SeriesFPreferredStockNANA14.414.44273714.45271714.54328114.69127414.98627515.09791715.79715515.80239315.80439315.80439315.80551815.85272116.02525516.03869216.15580716.452496NANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CommonStockSharesAuthorized NANANA350.0350.0350.0350.0350.0350.0350.0350.0350.0350.0350.0350.0350.0350.0350.0350.0350.0350.0350.0350.0350.0350.0350.0350.0350.0350.0350.0350.0350.0350.0350.0350.0250.0250.0250.0250.0NANANA
 us-gaap:CommonStockSharesAuthorized us-gaap:SubsidiarySaleOfStock udr:ForwardSalesAgreementNA2.3NA2.12.12.1NA1.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CommonStockSharesOutstanding NANANA294.479942295.067779294.881038294.588305292.948423283.104643281.791932275.5459268.390557267.667437267.583892267.822069267.599391267.557894267.398819261.844521262.015237259.091257NA255.114603255.215905251.49242251.430708250.749665250.743021250.742325250.741559250.139408250.136597250.205424227.967573219.650225219.038779196.660518187.273833182.49633NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding █▁297.542297.026NA295.003295.087295.16294.073289.529282.575277.557270.755268.861268.89269.2080.269221269.062268.859268.688266.108261.207262.806258.662256.0253.732252.191251.822249.987251.454251.406249.917NA249.825234.031NANANANA182.531NANANA156.131
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic █▁296.589296.537NA294.713294.71294.457293.107288.706281.96277.002270.107267.727267.311267.5460.26727267.056266.972266.79260.83259.114257.849256.834253.983251.655250.255250.177249.987249.985249.985249.917NA249.825234.031221.5NA213.816190.479182.531NA165.403160.886156.131
 us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities udr:StockCompensationPlanAndUnvestedRestrictedStock█▁0.9530.489NA0.290.3770.703NA0.8230.6150.555NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities us-gaap:ConvertiblePreferredStock▄▄2.9182.918NA2.9182.9533.011NA3.0113.0113.011NA3.0113.0113.011NA3.0163.0283.028NA3.0293.0363.036NA3.0355483.0355483.035548NA3.0355483.0355483.035548NA3.0355483.0355483.035548NA3.0355483.0355483.035548NA3.0355483.035548NA
 us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities us-gaap:EquityUnitPurchaseAgreements█▁22.5522.398NA22.32122.38622.228NA22.21122.73624.28NA24.55824.57424.506NA24.82224.86424.962NA9.0619.1259.165NA9.1889879.3157099.318924NA9.3233739.3238029.381025NA9.4058889.4168439.421302NA8.235068NANANANANANA
us-gaap:EarningsPerShareBasic ▂▂▃▁▄▂▅▃▃▃▅▃▃▅▄▂▂▃█▂▅▅▄▃▃▃▃▂▂▂▁▁█0.040.010.08000000000000002-0.090.190.010.330.090.120.080.30.070.070.30.260.060.030.090.620.050.330.280.259999999999999950.160.120.070.140.010.020.0-0.07000000000000006-0.040.62NANANANA-0.17NANANA-0.17
us-gaap:EarningsPerShareDiluted ▂▂▃▁▄▂▅▃▃▃▅▃▃▅▄▂▂▃█▂▅▅▄▃▃▃▃▂▂▂▁▁█0.040.010.08000000000000002-0.090.190.010.330.090.120.080.30.070.070.30.250.060.030.090.610.050.330.280.249999999999999940.160.120.070.140.010.020.0-0.07000000000000006-0.040.62NANANANA-0.17NANANA-0.17
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 Net profit Margin us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName udr:UnconsolidatedJointVentures▁█32.00632.137NA36.33537.31241.314NA75.378NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName udr:UnconsolidatedJointVentures▁█32.00632.137NA36.33537.31241.314NA75.378NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AllocatedShareBasedCompensationExpense NANA-8.34.34.06.8NA4.54.44.2NA3.63.63.5NA3.33.43.4NA4.45.14.5NA3.53.63.7NA2.42.41.925-6.00.834.72.3NA2.62.42.7NA3.13.1NA
 us-gaap:AllocatedShareBasedCompensationExpense us-gaap:IncomeStatementLocation us-gaap:GeneralAndAdministrativeExpense█▁6.44.9NANA4.06.8NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTax ▂▂▃▁▄▂▅▃▃▃▅▃▃▅▅▃▂▃█▂▅▄▄▄▃▃▃▂▂▂▂▂▇▅▄▁▂▁12.0333.63427.882-23.81258.7012.79996.21326.0230.75421.681.87320.21620.4783.16170.7316.41910.04827.288167.9248.29493.10967.23157.43241.98431.40619.78238.1824.3926.881.49-10.484-8.5150.68783.11948.023-18.3938.062-28.102NANANANA
us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest ▃▂▃▁▅▂▆▃▃▃▆▃▃▆▆▃▃▃█▂▄▃▃▃▃▂▃▂▂▂▂▂▅▄▂▂▂▂▂▂▂0.8360.2132.121-1.854.3930.1817.5022.1192.321.8477.451.7981.837.6026.5221.4010.8972.55810.6150.233.2532.3712.0391.51.1290.7071.3560.0920.2260.046-0.576-0.6065.9833.405-0.033-0.046-0.037-0.764-0.035-0.031-0.045NA
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest ▂▂▃▁▄▂▅▃▃▃▅▃▃▅▅▃▂▃█▂▅▄▄▃▃▃▃▂▂▂▂▂▇▅▄▁▂▁▁▁▁12.8693.84730.003-25.66263.0942.98103.71528.13933.07423.44789.32322.01422.390.76377.25217.8210.94529.846178.5398.52496.36269.60259.47143.48432.53520.48939.5384.4847.1061.536-11.06-9.106156.6786.52448.056-18.3478.099-28.051-28.149-23.871-28.778NA
us-gaap:CostsAndExpenses ██▇███▇▅▅▄▄▄▄▄▄▄▄▃▄▂▂▂▂▂▂▂▂▁▁▁▃▃▄▃▄▄▄▃▅▂▂▂275.561277.2272.101279.929276.782282.527260.036236.538221.665218.179207.349211.133204.564205.292205.593205.599201.774198.331202.79181.217176.56174.48175.241173.668170.844171.529165.845159.105160.317156.739198.401197.105204.227194.369203.846216.565208.183197.351231.199180.138176.019173.183
 us-gaap:GainLossOnInvestments us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName udr:UnconsolidatedJointVentures█▁38.358.488NA-0.01729.312NANA25.669NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:GainsLossesOnExtinguishmentOfDebt █▁▄0.0-41.95-24.65NANANA-23.311NANANANANANANANANANANANANANANANANANANANANANA0.00.0-0.008-4.1434.428-0.550.007-0.04-4.019-0.083-0.091-1.030.0
 us-gaap:GainsLossesOnExtinguishmentOfDebt us-gaap:FinancingReceivablePortfolioSegment udr:NoteDueMay2022OneNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:GeneralAndAdministrativeExpense ▆▄▃▃▂▆▅▃▃▃▂▃▃▃▃▃▃▄█▆▄▃▃▃▄▃▃▃▁▁15.12712.73611.97811.95810.97114.97814.53112.19712.33812.46710.95511.89612.37311.75911.5912.46711.43413.07517.99315.82413.72112.15211.72211.55412.5311.99411.53211.3649.8669.476NA10.02213.7389.379NANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▂▂▃▁▄▂▆▃▃▃█▃▃▃▃▃▂▃▂▃▂▅▂▂▂▂▂▂▂▂▁▂▁▁12.673.89329.219-27.0363.6225.704105.23930.92138.44328.814159.98520.41622.67719.15233.2917.69711.42826.5963.10413.0629.43875.992-0.6028.1192.169-8.524-5.9250.5772.671-2.282-18.008-11.503-25.941-21.135NANANANANANANANA
us-gaap:IncomeTaxExpenseBenefit ▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄█▄▄▃▄▃▃▄▅▃▃▁▃▄▄▄▄▃▄0.1350.6190.6680.1871.5260.1640.0021.4990.1252.2120.070.1580.2330.227-1.0650.1270.3660.332-1.424-0.633-1.404-0.42534.005-2.492-2.19-3.329-0.967-2.658-2.683-1.9737.578-2.96-2.818-22.876-6.7470.3680.0590.0-0.033-3.00.145NA
us-gaap:IncomeTaxesPaidNet █▂▂▁▄▃▁▃▄▂▂▂▃▂▂▂▅▂3.049-0.0360.165-0.461.0010.323-0.4340.5451.1670.2410.046-0.150.751-0.022-0.1430.1621.470.171NANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:InterestExpense ▅█▇▇▆▆▇▆▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▁▅▅▅▅▅▅▆▅35.40478.15662.52462.26838.59739.31760.43542.52334.41733.54238.22634.40131.59829.94334.21130.09533.86630.53933.1730.23229.67328.832.79233.08731.691-32.88433.3630.93930.80330.98130.6631.84541.54234.745NANANANANANANANA
us-gaap:InterestExpenseDebt ▂█▆▆▂▂▅▃▂▂▂▂▁▁▂▁▂▁▂▁▁▁35.40478.15662.52462.26838.59739.31760.43542.52334.41733.54238.22634.40131.59829.94334.21130.09533.86630.53933.1730.23229.67328.8NANANANANANANANA30.6631.83737.39939.17338.86339.61737.38135.58840.38436.12935.21835.133
us-gaap:InterestPaidNet ▁█▄█▃█▆█▂▆▃▆▂▄▄▃▄▄▃▄▃▅▃▄▄▅▃▄▂▅▅▅▆▄▅▆▅▆▅▅▅▅14.72556.28130.45557.22827.32357.3244.2657.82423.20344.27128.3345.93323.04835.15531.3428.96133.58432.46328.62235.1726.16640.28226.58335.94131.11138.1828.61134.69622.99741.57338.72441.85447.14931.77440.55644.78840.73542.49839.7641.43340.56238.429
us-gaap:NetIncomeLoss ▂▂▃▁▄▂▆▃▃▃▅▃▃▅▅▃▂▃█▂▅▅▄▃▃▃▃▂▂▂▂▂▇▅▄▂▃▁▁▁▁▁11.723.10426.532-25.25857.7715.22197.63927.20435.61924.50382.13918.6120.60181.75669.24416.1910.15725.967166.41513.29186.85573.82265.41740.54930.00718.36136.73.1885.192-0.268-12.3-9.031150.35283.15646.498-13.25114.651-27.875-28.456-23.766-26.621-24.056
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest ▃▄█▅▅▃▅▆▆▅▇▅▅▇▆▁▆█▃▃▃▃▃▃▃0.0080.0160.090.0310.0340.0060.0430.0560.0470.0420.080.0320.030.0790.057-0.0350.0510.091-0.003-0.0010.00.007-0.005-0.0040.002NANANANANANANA0.0430.0520.0330.0460.0370.0510.0350.0310.045NA
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic ▃▂▃▁▄▂▆▃▃▃▅▃▃▅▅▃▂▃█▃▅▅▄▄▃▃▃▂▂▂▂▂▇▅▄▂▃▁▁▁▁▁10.6632.04825.481-26.30956.7094.15596.60826.17334.58823.49281.16817.63919.6380.80168.35615.2649.22825.038161.2712.36185.92472.89164.48639.61829.07617.4335.7692.2574.261-1.199-13.231-9.962145.72180.84844.19-15.55912.149-30.243-30.825-26.134-28.968-26.435
us-gaap:OperatingIncomeLoss ▃▄▅▃▅▃▃▄▄▄█▄▄▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▂▂▁▁▁▁▁▁▁▁▁▁35.78775.0788.25730.11591.77738.95444.78258.85664.92552.494196.51555.01155.17948.01347.28745.49246.20545.5134.81540.20139.30245.27334.30833.08432.86226.5120.44134.48131.51330.485-11.982-10.784-23.529-18.444-29.46-24.016-28.561-28.295-25.474-27.807-27.316-26.559
us-gaap:OtherComprehensiveIncomeLossNetOfTax ▅▅▆▆▅▄▄▄▂▃▅▆▅▆▆▅▅▆▆▂█▂▁▆▆▆▆▆▆▆▆▅▅▅▆▂0.3340.5731.4521.5550.998-2.56-1.522-1.283-5.244-3.155-0.2921.756-0.1441.5381.6250.25-0.1171.451.376-5.1716.478-6.815-8.2811.4921.4491.4771.5361.2491.7521.8451.8950.570.364-0.1041.55-5.342NANANANANANA
us-gaap:OtherNonoperatingIncomeExpense ▃▃▁▃▃▃▃▃▃█▃▂▂▃▂▂▂▂▂▂▂▂2.5362.057-1.032.1832.4212.72.4061.8751.319.8131.661.1881.1282.7590.5480.4810.5150.4270.4070.4020.3820.36NANANANANANANANANANANANANANANANANANANANA
us-gaap:PreferredStockDividendsIncomeStatementImpact ▅▅▅▅▅▅▅▅▅▅▅▅▅▅▄▄▄▄▄▄█▁▄▄▄▄▄▄▄▄▄▄▄▄▄▄1.0571.0561.0511.0511.0621.0661.0311.0311.0311.0110.9710.9710.9710.9550.9240.9260.9290.9290.930.932.793-0.9310.9310.9310.9310.9310.9310.9310.9310.9310.9310.9310.9310.9310.9310.931NANANANANANA
us-gaap:ProfitLoss ▂▂▃▁▄▂▆▃▃▃▅▃▃▅▅▃▂▃█▂▅▅▄▃▃▃▃▂▂▂▂▂▇▅▄▂▂▁▁▁▁▁12.5353.27428.551-27.21762.0965.54105.23729.42238.31826.60289.61520.25822.44489.22575.62717.5711.06228.396177.16313.69589.88476.41767.75241.99231.08619.01238.0023.2355.354-0.309-12.955-9.676156.30686.62848.118-13.78614.909-28.656-29.317-24.605-27.64-25.026
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▆▆▆▆▆▆▆▆▆▆▆▆▆▆▁█████████████████▇▇▇█▇▇█▇▇▇2.2321.6151.2081.1991.2741.3882.0736.3862.8452.7512.9352.8883.1092.822-731.429251.091247.979243.841237.605221.418215.862219.753209.549206.752203.706198.039186.286193.586191.83187.224186.419186.321180.698175.925174.386192.549179.622169.056205.725152.331148.703146.624
us-gaap:Revenues █▇▇█▇█▇▇▆▆▆▆▆▅▅▅▅▅▅▄▄▄▄▃▃▃▃▃▃▃▃▃▂▂▂▃▂▂▃▁▁▁311.348301.441302.384310.044307.256321.481304.818295.394281.308270.673267.667266.144259.743253.305241.398251.091247.979243.841237.605221.418215.862219.753209.549206.752203.706198.039186.286193.586191.83187.224186.419186.321180.698175.925174.386192.549179.622169.056205.725152.331148.703146.624
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:Assets █▇█▇▇██▆▅▅▅▄▄▄▅▅▅▅▄▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▂▁▁9919.2719566.5569637.5339551.3889564.4719691.1059636.4728697.5978197.2667955.7257711.7287678.7847707.3587709.0487733.2737760.7057767.9347735.9117663.8446922.736939.736858.5116846.5346898.0886932.4056834.0236807.7226756.0666743.5436890.7816888.5096910.9026972.6216942.5156721.3546804.9035961.7775501.8775529.54NANANA
us-gaap:Liabilities █▇▇▆▆▆▆▃▃▂▂▂▂▂▂▂▂▂▂▁▂▁▂▂▂▂▁▁▁▁▁▁▁▃▃▃▂▁▂6009.8225560.4695522.6485457.955315.065393.5825228.4934353.6414228.7193941.8633816.2114078.5164016.2793947.153949.7713964.6223901.6693791.2223816.7973735.3543790.953735.5873828.1043869.1563982.4213851.4463777.6213706.1973638.5953733.0583671.2593621.9023614.3814152.9074166.0954265.3443943.823741.1913800.453NANANA
us-gaap:LiabilitiesAndStockholdersEquity █▇█▇▇██▆▅▅▅▄▄▄▅▅▅▅▄▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▂▁▁9919.2719566.5569637.5339551.3889564.4719691.1059636.4728697.5978197.2667955.7257711.7287678.7847707.3587709.0487733.2737760.7057767.9347735.9117663.8446922.736939.736858.5116846.5346898.0886932.4056834.0236807.7226756.0666743.5436890.7816888.5096910.9026972.6216942.5156721.3546804.9035961.7775501.8775529.54NANANA
us-gaap:StockholdersEquity ▅▆▇▇███▇▆▆▆▅▅▆▆▆▆▆▆▆▆▆▅▅▅▅▆▆▆▆▆▆▇▄▄▄▂▁▁2784.273001.7283234.23312.6563397.3223464.1153358.5423246.5622949.4042948.9822905.6252593.2552757.4942877.462825.82845.0232892.6153036.1652899.7552874.3592857.6422810.1812735.0972778.262682.5332741.0092811.6482828.0192866.3722931.2082992.9163051.633110.1062533.1792314.052326.0921826.8731633.5881606.343NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:CashAndCashEquivalentsAtCarryingValue ▁▁▁▁▁▁▁▁▁▁█▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▁▁▁▁▄█▁▁▁▂▁▁▁▁▂3.371.1721.4090.9270.8330.988.1061.8950.9811.043185.2161.0841.0551.0832.0381.7881.4112.466.7421.3212.996.27415.22414.60526.81615.89130.24911.1499.0357.12112.11582.377184.1123.55812.50313.48221.63411.6929.48610.1078.07419.92
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▂▂▁▁▁▁▁▁▁▁█▁▁▁▁▁▁▁▁36.0734.624.17124.222.87622.92933.29123.54124.02324.154208.89128.0830.91220.85321.8322.20121.01322.21727.54NANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:Land █▇▇▇▇▇▇▅▄▄▂▂▂▁▁▁▁▂▂2232.762148.9772139.7652144.4892162.7782163.0552164.0322020.6171965.5771954.3631849.7991824.8471851.4861773.4021780.2291788.3911788.3911812.7971833.156NANANA1790.281NANANANANANANANANA1856.0261839.7941919.2491970.4741799.78NA1693.775NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:FiniteLivedIntangibleAssetsNet NANA37.413NANANA81.458NANANANANANANANANANANANANANANANANANANA9.0NANANA11.9NANANA21.4NANANA13.3NANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:LeasesAcquiredInPlaceNANA2.631NANANA43.614NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:RealEstateNANA34.782NANANA37.844NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseRightOfUseAsset ███████▄▁▁199.206200.064200.913201.754202.586203.41204.225135.88993.93994.145NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 us-gaap:LiabilitiesNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName udr:DeveloperCapitalProgramAndOtherInvestmentsNANA247.247NANANA106.385NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LiabilitiesNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName udr:JointVenturesAndPartnershipsExcludingDeveloperCapitalProgramNANA941.463NANANA1041.663NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LiabilitiesNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName udr:TotalJointVenturesAndPartnershipsNANA1188.71NANANA1148.048NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LiabilitiesNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName udr:UnconsolidatedJointVentureOneUDRMetLifePartnershipNANA70.946NANANA70.89NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LiabilitiesNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName udr:UnconsolidatedJointVentureOtherMetLifeNANA454.153NANANA454.972NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LiabilitiesNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName udr:UnconsolidatedJointVentureSevenUdrMetlifeIiPartnershipNANA416.364NANANA425.303NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LiabilitiesNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName udr:UnconsolidatedJointVentures█▁▁▂1259.2791193.3271188.711194.684NANA1148.048NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LongTermDebt █▇▆▆▆▆▅▃▃▂▂▂▂▂▂▂▂▁▂▁▂▁▂▂▂▂▁▁▁▁▁5452.1075041.1754976.5484917.6464766.8044885.1384707.5243935.8973870.5893589.8293547.7873811.183752.1123680.6733671.6633679.0113634.6483537.2923570.7953513.2343564.4033516.6693583.1053628.1923747.7943628.2463523.7033463.1723394.7233499.1073409.333NANANA3918.37NANANANANANANA
us-gaap:MinorityInterest ▆▄▇▆▅▄█▇▅▄▅▄▃▃▃▃▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▂20.90314.67324.39120.79617.62314.27530.77225.21318.61113.38217.15214.20811.2568.3189.5647.8785.8533.7460.8560.8590.860.860.8530.8580.8620.860.8560.8860.9230.920.9163.9914.8294.7864.7344.7013.7753.7383.687NANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo dei:LegalEntity udr:UnitedDominionRealityLPNANA12.62512.60912.59812.58912.598NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo dei:LegalEntity,us-gaap:PropertyPlantAndEquipmentByType udr:UnitedDominionRealityLP,udr:EquipmentLeasesNANA0.1830.1670.1560.1470.156NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo dei:LegalEntity,us-gaap:PropertyPlantAndEquipmentByType udr:UnitedDominionRealityLP,udr:GroundLeasesNANA12.442NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo dei:LegalEntity,us-gaap:PropertyPlantAndEquipmentByType udr:UnitedDominionRealityLP,us-gaap:LandNANANA12.44212.44212.44212.4427.8134.9014.901NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo us-gaap:PropertyPlantAndEquipmentByType udr:GroundLeasesNANA12.442NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo us-gaap:PropertyPlantAndEquipmentByType us-gaap:Land▄▄12.44212.442NA12.44212.44212.44212.4427.8134.9014.901NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree dei:LegalEntity udr:UnitedDominionRealityLPNANA12.62912.61312.60212.59212.601NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree dei:LegalEntity,us-gaap:PropertyPlantAndEquipmentByType udr:UnitedDominionRealityLP,udr:EquipmentLeasesNANA0.1870.1710.160.150.159NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree dei:LegalEntity,us-gaap:PropertyPlantAndEquipmentByType udr:UnitedDominionRealityLP,udr:GroundLeasesNANA12.442NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree dei:LegalEntity,us-gaap:PropertyPlantAndEquipmentByType udr:UnitedDominionRealityLP,us-gaap:LandNANANA12.44212.44212.44212.4427.8134.9014.901NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree us-gaap:PropertyPlantAndEquipmentByType udr:GroundLeasesNANA12.442NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree us-gaap:PropertyPlantAndEquipmentByType us-gaap:Land▄▄12.44212.442NA12.44212.44212.44212.4427.8134.9014.901NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour dei:LegalEntity udr:UnitedDominionRealityLPNANA12.63312.61612.60512.59512.605NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour dei:LegalEntity,us-gaap:PropertyPlantAndEquipmentByType udr:UnitedDominionRealityLP,udr:EquipmentLeasesNANA0.1910.1740.1630.1530.163NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour dei:LegalEntity,us-gaap:PropertyPlantAndEquipmentByType udr:UnitedDominionRealityLP,udr:GroundLeasesNANA12.442NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour dei:LegalEntity,us-gaap:PropertyPlantAndEquipmentByType udr:UnitedDominionRealityLP,us-gaap:LandNANANA12.44212.44212.44212.4427.8134.9014.901NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour us-gaap:PropertyPlantAndEquipmentByType udr:GroundLeasesNANA12.442NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour us-gaap:PropertyPlantAndEquipmentByType us-gaap:Land▄▄12.44212.442NA12.44212.44212.44212.4427.8134.9014.901NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive dei:LegalEntity udr:UnitedDominionRealityLPNANA12.637NA12.60912.59812.608NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive dei:LegalEntity,us-gaap:PropertyPlantAndEquipmentByType udr:UnitedDominionRealityLP,udr:EquipmentLeasesNANA0.195NA0.1670.1560.166NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive dei:LegalEntity,us-gaap:PropertyPlantAndEquipmentByType udr:UnitedDominionRealityLP,udr:GroundLeasesNANA12.442NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive us-gaap:PropertyPlantAndEquipmentByType udr:GroundLeasesNANA12.442NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive dei:LegalEntity udr:UnitedDominionRealityLPNANA443.591NA456.073456.016456.09NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive dei:LegalEntity,us-gaap:PropertyPlantAndEquipmentByType udr:UnitedDominionRealityLP,udr:EquipmentLeasesNANA0.813NA0.8520.7950.869NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive dei:LegalEntity,us-gaap:PropertyPlantAndEquipmentByType udr:UnitedDominionRealityLP,udr:GroundLeasesNANA442.778NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive us-gaap:PropertyPlantAndEquipmentByType udr:GroundLeasesNANA442.778NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:StockholdersEquity ▅▆▇▇███▇▆▆▆▅▅▆▆▆▆▆▆▆▆▆▅▅▅▅▆▆▆▆▆▆▇▄▄▄▂▁▁2784.273001.7283234.23312.6563397.3223464.1153358.5423246.5622949.4042948.9822905.6252593.2552757.4942877.462825.82845.0232892.6153036.1652899.7552874.3592857.6422810.1812735.0972778.262682.5332741.0092811.6482828.0192866.3722931.2082992.9163051.633110.1062533.1792314.052326.0921826.8731633.5881606.343NANANA
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest ▅▆▇▇███▇▆▆▆▅▅▆▆▆▆▆▆▆▆▅▅▅▅▅▆▆▆▆▆▆▇▄▄▄▂▁▁2805.1733016.4013258.5913333.4523414.9453478.393389.3143271.7752968.0152962.3642922.7772607.4632768.752885.7782835.3642852.9012898.4683039.9112900.6112875.2182858.5022811.0412735.952779.1182683.3952741.8692812.5042828.9052867.2952932.1282993.8323055.6213114.9352537.9652318.7842330.7931830.6481637.3261610.03NANANA
us-gaap:CommonStockValue ████████▇▇▇▆▆▆▆▆▆▆▆▆▆▆▅▅▅▅▅▅▅▅▅▅▅▄▃▃▂▁▁2.9682.9682.9662.9452.9512.9492.9462.9292.8312.8182.7552.6842.6772.6762.6782.6762.6762.6742.6182.622.5912.592.5512.5522.5152.5142.5072.5072.5072.5072.5012.5012.5022.282.1972.191.9671.8731.825NANANA
us-gaap:AdditionalPaidInCapital ████████▇▇▆▅▅▅▅▅▅▅▅▅▅▅▅▅▄▄▄▄▄▄▄▄▄▃▃▃▂▁▁5887.8385885.6825881.3835776.2675794.4285788.4715781.9755702.7825244.8195184.1954920.7324619.574639.1474638.7664651.2054643.8034640.554635.9424447.8164449.5554342.8294334.4184223.7474223.8934114.5664110.6254109.7654106.7514104.24101.6834098.8824098.0894098.7853543.2193340.473322.5052782.512548.8182450.141NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▄▄▄▃▃▂▃▄▄▇██▇▇▇▆▆▆▂▂▄▁▄█▇▆▆▅▄▄▃▂▂▂▂▁▃▆▆-8.301-8.614-9.144-10.494-11.94-12.87-10.448-9.022-7.838-2.97-0.0670.202-1.407-1.276-2.681-4.167-4.395-4.288-12.678-14.187-9.19-15.445-8.855-0.866-2.305-3.704-5.125-6.608-7.811-9.499-11.257-13.073-13.604-13.939-13.902-15.427-10.285-3.696-3.469NANANA
 us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax dei:LegalEntity udr:UnitedDominionRealityLPNANA-0.049-0.049-0.043NANANANANANANANANANANANA-0.053-0.113-0.329-0.599-0.84-1.075-1.475-2.06-2.493-3.065-3.612-4.001-4.554-5.369-6.23-6.59NA-6.902-7.541-5.959NA-5.502NANANA
us-gaap:MinorityInterest ▆▄▇▆▅▄█▇▅▄▅▄▃▃▃▃▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▂20.90314.67324.39120.79617.62314.27530.77225.21318.61113.38217.15214.20811.2568.3189.5647.8785.8533.7460.8560.8590.860.860.8530.8580.8620.860.8560.8860.9230.920.9163.9914.8294.7864.7344.7013.7753.7383.687NANANA
us-gaap:StockIssuedDuringPeriodValueNewIssues -0.393NANANANANA63.306449.13720.693192.179NANANANANANANANA0.12-101.3920.051-108.79-199.8499.9910.00.00.0NANANA-0.098-0.205555.818200.62315.444539.205230.93794.168NANANANA
 us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital-0.393NANANANANA63.293449.04120.688192.135NANANANANANANANA-420.016318.7730.051-108.756-199.772NANANANANANANA-0.098-0.205555.593200.54315.437538.98230.84494.127NANANANA
 us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:SubsidiarySaleOfStock udr:ForwardSalesAgreementNANA102.2NANANA63.2NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities █▄▆▅▇▅▇▆▆▅▆▆▄▅▅▆▄▄▅▃▄▃▄▃▄▃▃▃▄▂▂▃▃▂▂▂▂▁▂▂▂▁206.552123.605147.724139.577181.559135.456173.828170.455149.088137.333153.952151.623122.845132.256130.283148.871119.737120.261125.81388.799120.98596.018110.38295.765103.69282.52178.60588.908105.72966.6671.92597.31278.0970.01461.31567.84667.12247.95356.69155.7160.26941.51
us-gaap:NetCashProvidedByUsedInInvestingActivities ▄▆▅▅▆▅▄▃▄▃▇▆▆▆▆▅▅▅▆▆▅▆▆▆▅▅▆▆▇▅▅▅█▅▆▁▅▆▅▄▆▆-355.77641.039-168.111-130.83752.15-214.044-303.885-576.809-346.244-459.74989.558-91.851-86.669-24.586-24.058-100.679-119.881-162.823-10.257-64.416-114.238-49.5387.252-21.338-142.865-136.7095.291-92.58765.104-101.017-150.126-136.955302.049-224.35333.602-820.724-209.202-56.858-104.906-356.657-64.822-57.369
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity udr:UnitedDominionRealityLPNANA-118.387-8.448-7.088-6.116-12.238-12.069-9.941-9.6581.045-8.348-7.38986.375-75.79-10.342-11.998-7.9547.751-18.65911.393-16.902-20.24-23.785-31.50628.88140.759-28.926-49.122-26.665-30.134-33.90786.197-17.883120.483-299.004NANA-15.649-15.561NANA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▄▂▃▃▁▃▄▆▄▄▂▂▂▂▂▂▃▃▂▂▃▂▂▂▃▃▂▃▁▃▃▂▁▄▂█▄▃▃▅▃▃150.694-154.21520.358-7.416-233.76268.226139.807405.872197.025137.679-62.699-62.604-26.117-108.647-105.975-47.815-0.66842.673-110.135-26.052-10.031-55.43-117.015-86.63850.09839.83-64.7965.793-168.91929.3637.939-62.092-199.585145.394-95.896744.726152.02211.11147.594302.98-7.29329.794
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AmortizationOfFinancingCosts NA1.21.21.11.11.01.11.11.11.01.01.11.11.01.11.11.11.12.41.51.51.5NANANANANANANANA-2.7192.092.2472.542.2952.1631.3152.9233.0961.9221.8452.094
 us-gaap:AmortizationOfFinancingCosts us-gaap:IncomeStatementLocation us-gaap:InterestExpense1.2NANANA1.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:DepreciationDepletionAndAmortization ▇▇▇███▇▆▅▄▄▄▄▄▄▄▄▄▄▃▃▂▃▂▂▂▃▂▂▂▂▂▂▃▃▃▃▂▂▁▁▁148.771146.689148.209155.836157.083157.501145.177129.01119.612114.124108.085109.563108.204109.827111.049108.756110.017106.64106.80892.02592.04490.493.52490.72390.06989.61391.93285.44286.26984.58884.54889.30185.49195.16598.26698.70392.14785.15883.04376.78275.03473.43
us-gaap:NetCashProvidedByUsedInOperatingActivities █▄▆▅▇▅▇▆▆▅▆▆▄▅▅▆▄▄▅▃▄▃▄▃▄▃▃▃▄▂▂▃▃▂▂▂▂▁▂▂▂▁206.552123.605147.724139.577181.559135.456173.828170.455149.088137.333153.952151.623122.845132.256130.283148.871119.737120.261125.81388.799120.98596.018110.38295.765103.69282.52178.60588.908105.72966.6671.92597.31278.0970.01461.31567.84667.12247.95356.69155.7160.26941.51
us-gaap:NetIncomeLoss ▂▂▃▁▄▂▆▃▃▃▅▃▃▅▅▃▂▃█▂▅▅▄▃▃▃▃▂▂▂▂▂▇▅▄▂▃▁▁▁▁▁11.723.10426.532-25.25857.7715.22197.63927.20435.61924.50382.13918.6120.60181.75669.24416.1910.15725.967166.41513.29186.85573.82265.41740.54930.00718.36136.73.1885.192-0.268-12.3-9.031150.35283.15646.498-13.25114.651-27.875-28.456-23.766-26.621-24.056
us-gaap:ProfitLoss ▂▂▃▁▄▂▆▃▃▃▅▃▃▅▅▃▂▃█▂▅▅▄▃▃▃▃▂▂▂▂▂▇▅▄▂▂▁▁▁▁▁12.5353.27428.551-27.21762.0965.54105.23729.42238.31826.60289.61520.25822.44489.22575.62717.5711.06228.396177.16313.69589.88476.41767.75241.99231.08619.01238.0023.2355.354-0.309-12.955-9.676156.30686.62848.118-13.78614.909-28.656-29.317-24.605-27.64-25.026
us-gaap:ShareBasedCompensation ▄▃▂▂▂▄█▁▂▄▂▂▂▂▁▁▂▂▂▃▃▂6.3984.9124.534.2784.06.80811.312.7044.3795.9373.553.6123.5783.5042.793.2393.4543.3793.5785.3794.84.26NANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▄▆▅▅▆▅▄▃▄▃▇▆▆▆▆▅▅▅▆▆▅▆▆▆▅▅▆▆▇▅▅▅█▅▆▁▅▆▅▄▆▆-355.77641.039-168.111-130.83752.15-214.044-303.885-576.809-346.244-459.74989.558-91.851-86.669-24.586-24.058-100.679-119.881-162.823-10.257-64.416-114.238-49.5387.252-21.338-142.865-136.7095.291-92.58765.104-101.017-150.126-136.955302.049-224.35333.602-820.724-209.202-56.858-104.906-356.657-64.822-57.369
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity udr:UnitedDominionRealityLPNANA-118.387-8.448-7.088-6.116-12.238-12.069-9.941-9.6581.045-8.348-7.38986.375-75.79-10.342-11.998-7.9547.751-18.65911.393-16.902-20.24-23.785-31.50628.88140.759-28.926-49.122-26.665-30.134-33.90786.197-17.883120.483-299.004NANA-15.649-15.561NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▄▂▃▃▁▃▄▆▄▄▂▂▂▂▂▂▃▃▂▂▃▂▂▂▃▃▂▃▁▃▃▂▁▄▂█▄▃▃▅▃▃150.694-154.21520.358-7.416-233.76268.226139.807405.872197.025137.679-62.699-62.604-26.117-108.647-105.975-47.815-0.66842.673-110.135-26.052-10.031-55.43-117.015-86.63850.09839.83-64.7965.793-168.91929.3637.939-62.092-199.585145.394-95.896744.726152.02211.11147.594302.98-7.29329.794
us-gaap:PaymentsOfDividendsCommonStock █████▇▇▇▇▆▆▆▆▆▆▆▆▅▅▅▅▄▄▄▄▄▄▄▄▃▃▃▃▃▂▂▂▁▁▁▁▁107.6106.833106.024106.231106.165100.93100.3797.28696.51288.91186.55886.32686.30683.05183.00582.94882.89878.94272.7171.89971.86766.69266.35865.40465.38658.95258.92558.81959.04355.03555.03255.03950.08547.31443.51239.02234.26233.6533.52230.11529.03828.054
us-gaap:PaymentsForRepurchaseOfCommonStock NANA0.019.8NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 us-gaap:DebtInstrumentInterestRateStatedPercentage dei:LegalEntity,us-gaap:LongtermDebtType udr:UnitedDominionRealityLP,udr:SecuredDebtAt4.64DueIn2023NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage dei:LegalEntity,us-gaap:LongtermDebtType udr:UnitedDominionRealityLP,udr:TwoPointOneZeroPercentMediumTermNoteDueAugust12032NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage dei:LegalEntity,us-gaap:LongtermDebtType,us-gaap:TypeOfArrangement udr:UnitedDominionRealityLP,udr:A3.75MTNDueJuly2024,udr:CashTenderOfferNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument udr:MediumTerm1.90PercentageNoteDueMarch2033NANA1.8999999999999998e-06NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:LongtermDebtType udr:FixedRateDebt,udr:MortgageNotePayableMaturesOn2031NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:LongtermDebtType udr:FixedRateDebt,udr:MortgageNotePayableMaturesOnNovember2020NANANANA4.35e-08NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:RealEstateProperties udr:FixedRateDebt,udr:HomeOperatingCommunity300FranklinMaNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:LongtermDebtType udr:SecuredDebtAt4.64DueIn2023NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:LongtermDebtType udr:TwoPointOneZeroPercentMediumTermNoteDueAugust12032NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:LongtermDebtType,us-gaap:TypeOfArrangement udr:A3.75MTNDueJuly2024,udr:CashTenderOfferNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:RealEstateProperties,us-gaap:SubsequentEventType udr:HomeOperatingCommunity300FranklinMa,us-gaap:SubsequentEventNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:StatementScenario,us-gaap:DebtInstrument,us-gaap:LongtermDebtType srt:ScenarioForecast,udr:FixedRateDebt,udr:MortgageNotePayableMaturesOn2031NANANA2.62e-08NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2968000.02968000.02966000.02945000.02951000.02949000.02946000.02929000.02831000.02818000.02755000.02684000.02677000.02676000.02678000.02676000.02676000.02674000.02673000.02672000.02671000.02671000.02618000.02620000.02591000.02590000.02551000.02552000.02515000.02514000.02507000.02507000.02507000.02507000.02501000.02501000.02502000.02280000.02197000.02190000.01967000.01873000.01825000.01555000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Shares Issued

us-gaap:SharesIssued us-gaap:StatementClassOfStock

us-gaap:SharesIssued

us-gaap:CommonStock


Shares
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value296294275267267261255219196187182155137133
Percentage of SharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SeriesEPreferredStock


Shares
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value2.6952.7812.7809942.7809942.7969032.7969032.803812
Percentage of SharesIssued0.90.91.01.01.01.11.1

us-gaap:SeriesFPreferredStock


Shares
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value1414151516162.464183
Percentage of SharesIssued4.95.05.75.96.16.31.0

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesIssued


Common
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value294295294294292283281275268267267267267267267267267267267261255255251251250250250250250250250227219219196187182155
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Preferred Stock Shares Issued

us-gaap:PreferredStockSharesIssued us-gaap:StatementClassOfStock

us-gaap:PreferredStockSharesIssued

us-gaap:SeriesEPreferredStock


Preferred
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value2.6953632.6953632.7809942.7809942.7809942.7809942.7809942.7809942.7809942.7809942.7809942.7809942.7809942.7969032.7969032.7969032.7969032.7969032.7969032.7969032.8038122.8038122.8038122.8038122.8038122.8038122.8038122.8038122.8038122.8038122.8038122.8038122.8038122.803812
Percentage of PreferredStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SeriesFPreferredStock


Preferred
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value141414141414151515151515151616161616161616
Percentage of PreferredStockSharesIssued0.0535.8536.2523.0528.3538.9542.9568.0568.2568.3568.3568.3570.0576.2573.4577.6579.1582.5588.2588.2588.2

Common Stock Shares Authorized

us-gaap:CommonStockSharesAuthorized

us-gaap:CommonStockSharesAuthorized


Common
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value350350350350350350350350350350350350350350350350350350350350350350350350350350350350350350350350350350350350250250250250250
Percentage of CommonStockSharesAuthorized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockSharesAuthorized us-gaap:SubsidiarySaleOfStock

udr:ForwardSalesAgreement


Common
Period End2021-03-312020-09-302020-06-302020-03-312019-09-30
Value2.32.12.12.11.3
Percentage of CommonStockSharesAuthorized0.00.60.60.60.4

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStockSharesOutstanding


Common
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value294295294294292283281275268267267267267267267267267267267261262259255255251251250250250250250250250227219219196187182155
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302011-03-312010-03-31
Value2972972952952952942892822772702682682690.269221269268268271268268264266261262258256253252251249251251249249234182156
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value2962962942942942932882812772702672672670.26727267266266266266266262260259257256253251250250249249249249249234221213190182165160156
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

udr:StockCompensationPlanAndUnvestedRestrictedStock


Antidilutive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value0.9530.4890.290.3770.7030.8230.6150.555
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConvertiblePreferredStock


Antidilutive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value2.9182.9182.9182.9533.0113.0113.0113.0113.0113.0113.0113.0163.0283.0283.0283.0283.0283.0293.0363.0363.0355483.0355483.0355483.0355483.0355483.0355483.0355483.0355483.0355483.0355483.0355483.0355483.0355483.035548
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount306.2596.71006.2783.3428.3365.9489.6542.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:EquityUnitPurchaseAgreements


Antidilutive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-30
Value22222222222222242424242424242525259.0619.1259.1659.1889879.3157099.3189249.3233739.3238029.3810259.4058889.4168439.4213028.235068
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount2366.24580.47696.95937.93161.92698.83696.94374.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-03-312010-03-31
Value0.040.010.08-0.090.190.010.330.090.120.080.30.070.070.30.260.060.030.090.890.10.060.040.620.050.330.280.260.160.120.070.140.010.020-0.07-0.040.62-0.17-0.17
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-03-312010-03-31
Value0.040.010.08-0.090.190.010.330.090.120.080.30.070.070.30.250.060.030.090.880.10.060.040.610.050.330.280.250.160.120.070.140.010.020-0.07-0.040.62-0.17-0.17
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense


Allocated
Period End2020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value-8.34.34.06.84.54.44.23.63.63.53.33.43.43.53.23.94.45.14.53.53.63.72.42.41.925-6.00.834.72.32.62.42.73.13.1
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0358.6314.0489.970.5154.7152.7124.7115.8124.01.31.41.40.00.00.02.02.42.01.71.81.91.21.31.00.00.42.61.31.41.31.62.02.1

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:IncomeStatementLocation

us-gaap:GeneralAndAdministrativeExpense


Allocated
Period End2021-06-302021-03-312020-06-302020-03-31
Value6.44.94.06.8
Percentage of AllocatedShareBasedCompensationExpense0.00.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax286.7303.4314.0489.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:GeneralAndAdministrativeExpense0.00.00.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value123.63427-23.812582.7999626302181202083701610272422817111678.294936757413119384.3926.881.49-10.484-8.51508348-18.3938.062-28.102
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax539.1225.00.0-1986.04607.6201.70.0407.51081.0785.20.0700.0658.42946.90.06.54.111.20.00.00.00.00.03.743.130.60.020.315.410.00.02.33.60.80.0-4.683.447.20.0-9.64.5-16.6

us-gaap:ComprehensiveIncomeNetOfTax dei:LegalEntity

udr:UnitedDominionRealityLP


Comprehensive
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value72181923262785272491612010135011114.786115144736339.22224314511108.5440.5120.44551-6.76331-8.2145.58
Percentage of ComprehensiveIncomeNetOfTax258.6-78.232.924.9103.189.1104.9137.0121.0109.986.3126.3108.550.220.840.064.943.468.6179.551.154.457.522.079.2157.2117.9259.6155.4573.4-4.9-5.234.1-8.166.644.769.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.01552.61517.30.0420.2962.90.0959.0796.43239.80.08.34.45.60.00.00.00.00.06.722.116.60.04.512.215.70.05.95.64.60.00.228.4-3.80.0-4.33.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value0.8360.2132.121-1.854.3930.1817.5022.1192.321.8477.451.7981.837.6026.5221.4010.8972.558222.6861.5370.692100.233.2532.3712.0391.51.1290.7071.3560.0920.2260.046-0.576-0.6065.9833.405-0.033-0.046-0.037-0.764-0.035-0.031-0.045
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax37.513.20.0-154.3344.813.00.033.281.567.10.062.358.9269.40.00.60.41.00.00.00.00.00.00.11.51.10.00.70.60.40.00.00.10.00.0-0.33.31.90.0-0.0-0.0-0.50.0-0.0-0.0

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest dei:LegalEntity

udr:UnitedDominionRealityLP


Comprehensive
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value0.4240.4350.4880.580.4480.4160.4440.440.420.4180.4810.3740.3430.350.3820.3680.350.6870.3350.3470.3940.2550.2380.178-0.284.717-0.039-0.066-0.0450.656-0.039-0.231-0.0340.161-0.032-0.032
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest20.0-23.511.17.721.117.96.024.523.05.57.426.738.213.71.713.722.86.5145.710.716.612.515.915.8-39.6347.9-42.4-29.2-97.8-113.96.4-3.9-1.0-487.969.686.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.036.338.30.07.014.60.015.213.514.80.00.10.10.10.00.00.00.00.20.20.20.00.10.1-0.10.0-0.0-0.0-0.00.0-0.0-0.1-0.00.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value123.84730-25.662632.9810328332389222290771710292653118111788.524966959433220394.4847.1061.536-11.06-9.1061568648-18.3478.099-28.051-28.149-23.871-28.778
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax576.6238.20.0-2140.34952.4214.70.0440.61162.5852.30.0762.3717.33216.30.07.14.412.20.00.00.00.00.03.844.631.70.021.016.010.30.02.33.70.80.0-4.986.749.20.0-9.54.5-16.60.0-15.7-19.4

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest dei:LegalEntity

udr:UnitedDominionRealityLP


Comprehensive
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value72191924272786282591612111145011115.13115154736339.4625314911108.5890.560.48451-6.72931-8.1825.612
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest241.8-74.231.423.797.084.196.6127.8112.9101.279.7118.5102.747.119.137.861.443.764.9178.649.853.156.021.877.0153.2125.1255.1151.4559.2-5.1-5.332.9-7.866.544.669.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.01588.91555.60.0427.2977.50.0974.2809.93254.60.08.44.55.80.00.00.00.00.06.922.216.80.04.612.315.80.05.95.64.60.00.328.5-3.80.0-4.23.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Costs And Expenses

us-gaap:CostsAndExpenses

us-gaap:CostsAndExpenses


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value275277272279276282260236221218207211204205205205201198193197197196202181176174175173170171165159160156198197204194203216208197231180176173
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12345.917164.10.023346.921725.420355.00.03704.07791.47930.90.07310.76579.77274.70.081.981.481.30.00.00.00.00.081.881.879.40.084.083.986.60.082.283.683.70.0105.8113.0110.50.0112.5115.9116.70.0118.3118.4118.1

us-gaap:CostsAndExpenses dei:LegalEntity

udr:UnitedDominionRealityLP


Costs
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30
Value8179767878747373737374757774767472737172758986878688868582848383100991009091106104709085
Percentage of CostsAndExpenses29.828.527.627.730.031.533.133.935.435.036.336.537.736.138.137.637.437.436.536.937.049.349.250.049.650.750.650.149.752.952.053.050.550.749.046.745.149.250.230.650.448.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.06656.26005.45641.20.01166.82579.62685.90.02559.82389.72657.80.029.631.030.60.00.00.00.00.040.340.339.70.042.642.443.40.043.543.544.30.053.755.351.60.055.358.20.059.657.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Gain Loss On Investments

us-gaap:GainLossOnInvestments us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:GainLossOnInvestments

udr:UnconsolidatedJointVentures


Gain
Period End2021-06-302021-03-312020-09-302020-06-302019-09-30
Value388.488-0.0172925
Percentage of GainLossOnInvestments100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1718.2525.6-1.42300.8402.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnconsolidatedJointVentures0.00.00.00.00.0

Gains Losses On Extinguishment Of Debt

us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:GainsLossesOnExtinguishmentOfDebt


Gains
Period End2021-06-302021-03-312020-12-312019-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.0-41.95-24.65-23.3110.00.0-0.008-4.1434.428-0.550.007-0.04-4.019-0.083-0.091-1.030.0
Percentage of GainsLossesOnExtinguishmentOfDebt0.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-2597.50.00.00.00.0-0.0-2.32.50.00.0-0.0-2.40.0-0.1-0.70.0

us-gaap:GainsLossesOnExtinguishmentOfDebt us-gaap:FinancingReceivablePortfolioSegment

udr:NoteDueMay2022One


Gains
Period End2021-04-30
Value0.1
Percentage of GainsLossesOnExtinguishmentOfDebt0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:NoteDueMay2022One0.0

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense

us-gaap:GeneralAndAdministrativeExpense


General
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value15121111101414121212101112111112111313111013171513121111121111119.8669.47610139.379
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax677.7788.60.0997.3861.11079.10.0191.0433.7453.20.0411.9398.0416.70.05.04.65.40.00.00.00.00.07.16.45.50.05.66.26.10.05.95.15.15.47.65.3

us-gaap:GeneralAndAdministrativeExpense dei:LegalEntity

udr:UnitedDominionRealityLP


General
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value4.4054.3233.9515.3085.1364.0664.1514.6613.8924.1434.5454.3094.1154.1344.4085.2194.9124.6313.8445.4216.417.9357.0325.6397.1736.9397.4596.976.4846.8555.8945.5754.6357.2954.92
Percentage of GeneralAndAdministrativeExpense36.836.236.035.435.333.333.637.435.534.836.736.635.533.238.639.937.139.235.539.235.650.151.246.461.260.159.558.156.260.359.758.846.253.152.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0360.6310.1382.40.063.7145.9169.40.0143.5146.2152.70.01.61.82.10.00.00.00.00.03.63.32.60.03.43.73.50.03.53.13.02.54.02.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value123.89329-27.03635.704105303828159202219331711265629118.1313.104139.43875-0.6028.1192.169-8.524-5.9250.5772.671-2.282-18.008-11.503-25.941-21.135
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax567.7241.10.0-2254.44993.9411.00.0484.21351.21047.40.0706.9729.4678.70.07.04.610.90.00.00.00.00.05.94.434.60.03.91.1-4.30.00.31.4-1.20.0-6.2-14.4-12.0

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value0.1350.6190.6680.1871.5260.1640.0021.4990.1252.2120.070.1580.2330.227-1.0650.1270.3660.332-4.485-0.0940.4020.403-1.424-0.633-1.404-0.42534-2.492-2.19-3.329-0.967-2.658-2.683-1.9737.578-2.96-2.818-22.876-6.7470.3680.0590.0-0.033-3.00.145
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.038.30.015.6119.811.80.023.54.480.40.05.57.58.00.00.10.10.10.00.00.00.00.0-0.3-0.7-0.20.0-1.2-1.1-1.70.0-1.4-1.4-1.10.0-1.6-1.6-13.00.00.20.00.00.0-2.00.1

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value3049000.0-36000.0165000.0-460000.01001000.0323000.0-434000.0545000.01167000.0241000.046000.0-150000.0751000.0-22000.0-143000.0162000.01470000.0171000.0-166000.07000.0585000.0267000.0
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax136.6-2.20.0-38.478.623.30.08.541.08.80.0-5.224.2-0.80.00.10.60.10.00.00.00.0

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value3578626238396042343338343129343033302931303133302928323331-32.8843330303030314134
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1586.24839.40.05193.33029.62832.60.0665.91209.71219.30.01191.21016.31061.10.012.013.712.50.00.00.00.00.013.713.713.10.016.015.6-16.60.016.016.116.50.017.123.019.7

us-gaap:InterestExpense dei:LegalEntity

udr:UnitedDominionRealityLP


Interest
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value7.4567.2677.177.4647.427.5217.3557.3717.6265.15.0835.0265.0485.055118.6117.4367.4487.5787.6057.7341010-10.7711110-10.1591063-8.773-9.05-10.01444-9.847
Percentage of InterestExpense11.911.718.619.012.317.721.422.019.914.816.116.814.816.834.428.225.423.324.724.523.336.136.8-37.433.831.6-32.1-30.5189.3-28.4-29.4-32.3146.7-30.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0606.1562.8537.80.0117.8258.5267.90.0176.6163.5178.10.02.04.73.50.00.00.00.00.04.95.1-4.90.05.1-5.05.10.0-4.5-4.7-5.30.0-5.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Expense Debt

us-gaap:InterestExpenseDebt

us-gaap:InterestExpenseDebt


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3578626238396042343338343129343033302931303133302928303137393839373540363535
Percentage of InterestExpenseDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1586.24839.40.05193.33029.62832.60.0665.91209.71219.30.01191.21016.31061.10.012.013.712.50.00.00.00.00.013.713.713.10.017.120.722.30.020.620.821.10.023.723.724.0

us-gaap:InterestExpenseDebt dei:LegalEntity

udr:UnitedDominionRealityLP


Interest
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30
Value0.6950.6860.7080.7420.750.5380.1610.192.6832.0472.031.9731.9972.0028.5995.5584.3834.3954.5254.5526.1399.7589.7579.629.9389.306-9.0088.8638.7058.5068.7838.9959.0379.3571212131313121212
Percentage of InterestExpenseDebt1.11.11.81.91.21.30.50.67.06.06.46.65.86.725.418.215.013.814.714.618.532.332.933.40.00.00.00.00.00.00.00.029.529.433.231.935.034.636.329.934.234.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.057.255.653.50.08.45.76.90.070.965.369.90.00.83.52.30.00.00.00.00.04.44.54.40.04.5-4.44.50.04.44.64.80.05.06.97.10.07.17.50.08.18.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:InterestExpenseDebt dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:UnitedDominionRealityLP, udr:UDRLighthouseDownREITL.P.


Interest
Period End2020-12-312020-09-302019-12-312019-09-30
Value4.1944.1793.6694.162
Percentage of InterestExpenseDebt6.76.76.19.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0348.50.065.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP udr:UDRLighthouseDownREITL.P.0.00.00.00.0

us-gaap:InterestExpenseDebt us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:UnconsolidatedJointVentures


Interest
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-30
Value7.46129.955101020
Percentage of InterestExpenseDebt21.115.516.026.326.348.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax334.2751.3830.3796.6745.5325.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnconsolidatedJointVentures0.00.00.00.00.00.0

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value14563057275744572344284523353128333228313231283526402635313828342241384147314044404239414038
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax659.73484.90.04773.02144.74129.70.0905.5815.61609.30.01590.5741.31245.70.011.513.513.30.00.00.00.00.015.912.118.30.017.415.319.30.017.912.022.20.022.526.118.10.023.322.725.10.027.227.326.2

us-gaap:InterestPaidNet dei:LegalEntity

udr:UnitedDominionRealityLP


Interest
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-312010-09-30
Value101010109.6459.468145.0316.1933.993.6223.3683.3483.354107.0666.0225.6045.7815.5159.90311111111111010109.86910121212151114171212
Percentage of InterestPaidNet35.518.338.318.621.816.461.411.421.98.715.79.610.711.631.521.820.918.117.617.334.633.245.228.544.531.035.128.137.028.443.628.931.530.332.737.535.738.131.431.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0875.4820.4768.40.0148.3501.1182.90.0138.2116.5119.30.01.34.32.90.00.00.00.00.05.35.55.20.05.45.45.40.05.15.26.40.06.88.56.80.08.90.08.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value113.10426-25.258575.22197273524821820816916102523726171016613867365403018363.1885.192-0.268-12.3-9.0311508346-13.25114-27.875-28.456-23.766-26.621-24.056
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax525.1192.20.0-2106.64534.6376.20.0426.01252.0890.70.0644.4662.62897.10.06.44.110.60.00.00.00.00.06.040.233.60.019.614.79.30.01.62.7-0.10.0-4.883.247.30.0-6.98.2-16.50.0-15.6-17.9-16.4

us-gaap:NetIncomeLoss dei:LegalEntity

udr:UnitedDominionRealityLP


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value721819242326272385272491612010135011114.787114144736328.63724304411107.729-0.3490.08551-6.92631-6.6327.476-2.031-8.37-6.845-2.57
Percentage of NetIncomeLoss271.8-73.733.5461.924.698.676.997.7104.6148.8120.2111.888.2128.1106.852.621.342.761.546.169.1110.054.649.249.921.381.4166.3121.2345.4195.6-2884.02.8-0.934.0-8.367.450.051.07.329.428.89.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.01553.11520.61737.60.0420.2962.9870.40.0959.0796.43239.80.08.34.45.60.00.00.00.00.06.622.016.50.04.212.015.40.05.75.34.10.00.028.3-3.90.0-3.44.2-1.20.0-4.5-1.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:AccumulatedDistributionsInExcessOfNetIncome


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312014-09-302014-06-302014-03-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value113.10426-25.258575.2219727352482182081691610252372617101661365403018-0.268-12.3-9.0311508346-13.25114-27.875
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax525.1192.20.0-2106.64534.6376.20.0426.01252.0890.70.0644.4662.62897.10.06.44.110.60.00.00.00.00.06.00.019.614.79.3-0.10.0-4.883.247.30.0-6.98.2-16.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedDistributionsInExcessOfNetIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Attributable To Noncontrolling Interest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value8000.016000.090000.031000.034000.06000.043000.056000.047000.042000.080000.032000.030000.079000.057000.0-35000.051000.091000.015000.051000.08000.0306000.0-3000.0-1000.007000.0-5000.0-4000.02000.043000.052000.033000.046000.037000.051000.035000.031000.045000.0
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.41.00.02.62.70.40.00.91.71.50.01.11.02.80.0-0.00.00.00.00.00.00.00.0-0.00.00.00.0-0.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value102.04825-26.309564.155962634238117198068159.2282523626179.46416112857264392917352.2574.261-1.199-13.231-9.9621458044-15.55912-30.243-30.825-26.134-28.968-26.435
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax477.7126.80.0-2194.24451.3299.40.0409.81215.7853.90.0610.8631.42863.30.06.13.710.30.00.00.00.00.05.639.833.20.019.214.38.80.01.22.2-0.60.0-5.380.646.00.0-8.16.8-17.90.0-17.2-19.5-18.0

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value357588309138445864521965555484745464549454138344039453433322620343130-11.982-10.784-23.529-18.444-29.46-24.016-28.561-28.295-25.474-27.807-27.316-26.559
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1603.44648.30.02511.77203.82806.50.0921.62282.11908.20.01904.81774.81701.40.018.118.618.70.00.00.00.00.018.218.220.60.016.016.113.40.017.816.416.30.0-5.8-13.0-10.50.0-12.5-15.9-16.70.0-18.3-18.4-18.1

us-gaap:OperatingIncomeLoss dei:LegalEntity

udr:UnitedDominionRealityLP


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value802728333337363411035323130302728292829262625262221191816121919175.74410105.156
Percentage of OperatingIncomeLoss91.392.631.386.974.563.256.965.656.364.759.865.863.568.058.961.660.462.969.668.577.364.366.850.661.358.456.262.062.157.561.155.9-47.9-93.7-46.4-28.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.02325.82252.12439.80.0582.31299.11252.10.01233.11060.51119.30.012.311.011.50.00.00.00.00.011.712.210.40.09.49.18.30.010.210.09.10.05.46.02.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingIncomeLoss dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:UnitedDominionRealityLP, udr:UDRLighthouseDownREITL.P.


Operating
Period End2020-12-312020-09-302019-12-312019-09-30
Value1.31-1.392-1.116-1.273
Percentage of OperatingIncomeLoss1.5-4.6-2.5-2.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-116.10.0-19.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP udr:UDRLighthouseDownREITL.P.0.00.00.00.0

us-gaap:OperatingIncomeLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:UnconsolidatedJointVentures


Operating
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-30
Value-0.883332.7095.9319.77421
Percentage of OperatingIncomeLoss-2.544.49.06.525.137.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-39.62063.8225.9465.5704.2342.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnconsolidatedJointVentures0.00.00.00.00.00.0

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value334000.0573000.01452000.01555000.0998000.0-2560000.0-1522000.0-1283000.0-5244000.0-3155000.0-292000.01756000.0-144000.01538000.01625000.0250000.0-117000.01450000.06063000.02004000.0-1020000.0124000.01376000.0-5171000.06478000.0-6815000.0-8281000.01492000.01449000.01477000.01536000.01249000.01752000.01845000.01895000.0570000.0364000.0-104000.01550000.0-5342000.0
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.035.50.0129.778.3-184.40.0-20.1-184.3-114.70.060.8-4.654.50.00.1-0.00.60.00.00.00.00.0-2.33.0-3.10.00.70.70.70.00.60.91.00.00.30.2-0.10.0-2.8

us-gaap:OtherComprehensiveIncomeLossNetOfTax dei:LegalEntity

udr:UnitedDominionRealityLP


Other
Period End2020-12-312020-09-302020-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value0-6000.0-43000.00052000.054000.06000.02000.01000.0-1000.0216000.0270000.0241000.0235000.0400000.0585000.0433000.0572000.0547000.0389000.0540000.0815000.0861000.0360000.0149000.0163000.0639000.0-1582000.0
Percentage of OtherComprehensiveIncomeLossNetOfTax0.0-0.4-4.30.00.0-44.43.70.10.1-0.1-0.815.7-5.23.7-3.4-4.839.229.938.735.631.130.844.245.463.240.9-156.741.229.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-0.5-3.40.00.00.00.00.00.00.00.00.00.10.10.10.00.30.20.30.00.20.30.40.00.20.10.10.0-0.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value2.5362.057-1.032.1832.4212.72.4061.8751.319.8131.661.1881.1282.7590.5480.4810.5150.4270.4810.4780.540.4310.4070.4020.3820.36
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax113.6127.40.0182.1190.0194.50.029.446.0356.70.041.136.397.80.00.20.20.20.00.00.00.00.00.20.20.2

us-gaap:OtherNonoperatingIncomeExpense dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:UnitedDominionRealityLP, udr:UDRLighthouseDownREITL.P.


Other
Period End2020-12-312020-09-302019-12-312019-09-30
Value-14.5232.228-14.1212.054
Percentage of OtherNonoperatingIncomeExpense1410.0102.1-586.9109.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0185.80.032.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP udr:UDRLighthouseDownREITL.P.0.00.00.00.0

us-gaap:OtherNonoperatingIncomeExpense us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:UnconsolidatedJointVentures


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-30
Value-0.014-1.6570.0180.117-0.0080.082
Percentage of OtherNonoperatingIncomeExpense-0.6-80.60.84.8-0.34.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.6-102.61.59.2-0.61.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnconsolidatedJointVentures0.00.00.00.00.00.0

Preferred Stock Dividends Income Statement Impact

us-gaap:PreferredStockDividendsIncomeStatementImpact

us-gaap:PreferredStockDividendsIncomeStatementImpact


Preferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value1057000.01056000.01051000.01051000.01062000.01066000.01031000.01031000.01031000.01011000.0971000.0971000.0971000.0955000.0924000.0926000.0929000.0929000.0930000.0929000.0929000.0929000.0930000.0930000.02793000.0-931000.0931000.0931000.0931000.0931000.0931000.0931000.0931000.0931000.0931000.0931000.0931000.0931000.0931000.0931000.0
Percentage of PreferredStockDividendsIncomeStatementImpact100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax47.465.40.087.783.476.80.016.136.236.80.033.631.233.80.00.40.40.40.00.00.00.00.00.41.3-0.40.00.50.50.50.00.50.50.50.00.50.50.50.00.5

us-gaap:PreferredStockDividendsIncomeStatementImpact us-gaap:StatementEquityComponents

us-gaap:AccumulatedDistributionsInExcessOfNetIncome


Preferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value1057000.01056000.01051000.01051000.01062000.01066000.01031000.01031000.01031000.01011000.0971000.0971000.0971000.0955000.0924000.0926000.0929000.0929000.0930000.0929000.02787000.0-929000.0-930000.0-930000.0-931000.0-931000.0931000.0931000.0931000.0931000.0931000.0931000.0931000.0931000.0931000.0931000.0931000.0931000.0931000.0931000.0
Percentage of PreferredStockDividendsIncomeStatementImpact100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0300.0-100.0-100.0-100.0-33.3100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax47.465.40.087.783.476.80.016.136.236.80.033.631.233.80.00.40.40.40.00.00.00.00.0-0.4-0.4-0.40.00.50.50.50.00.50.50.50.00.50.50.50.00.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedDistributionsInExcessOfNetIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value123.27428-27.217625.54105293826892022897517112825929191117713897667413119383.2355.354-0.309-12.955-9.6761568648-13.78614-28.656-29.317-24.605-27.64-25.026
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax561.6202.70.0-2270.04874.1399.10.0460.71346.9967.00.0701.5721.93161.80.07.04.511.60.00.00.00.00.06.241.634.80.020.315.39.60.01.72.8-0.20.0-5.286.549.20.0-7.28.3-17.00.0-16.2-18.6-17.1

us-gaap:ProfitLoss dei:LegalEntity

udr:UnitedDominionRealityLP


Profit
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30
Value721919242427272486282591612111145011115.131115144736328.87524304811107.774-0.3010.12451-6.89231-6.67.508-8.373-6.836-2.552
Percentage of ProfitLoss254.1-70.032.0444.823.392.772.691.596.3138.9112.2102.981.4120.1101.249.319.640.358.244.265.3109.253.148.148.521.179.1162.1128.7341.6190.9-2515.92.3-1.332.9-8.065.147.950.428.627.89.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.01589.41558.91775.20.0427.2977.5884.60.0974.2809.93254.60.08.44.55.70.00.00.00.00.06.822.116.70.04.312.115.60.05.75.34.20.00.128.4-3.90.0-3.44.20.0-4.5-1.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ProfitLoss dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:UnitedDominionRealityLP, udr:UDRLighthouseDownREITL.P.


Profit
Period End2020-12-312020-09-302019-12-312019-09-30
Value-0.475-3.343-2.784-3.381
Percentage of ProfitLoss-1.712.3-2.6-11.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-278.80.0-52.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP udr:UDRLighthouseDownREITL.P.0.00.00.00.0

us-gaap:ProfitLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:UnconsolidatedJointVentures


Profit
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-30
Value2928-7.24525-0.581124
Percentage of ProfitLoss239.3856.126.640.6-10.5421.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1343.81735.5-604.31978.9-41.91942.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnconsolidatedJointVentures0.00.00.00.00.00.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2.2321.6151.2081.1991.2741.3882.0736.3862.8452.7512.9352.8883.1092.822-731.429251247243237221215219209206203198186193191187186186180175174192179169205152148146
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value311301302310307321304295281270267266259253241251247243237221215219209206203198186193191187186186180175174192179169205152148146
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13949.318665.125031.825858.524117.423161.514704.24625.69887.89839.19119.89215.58354.68976.1-33.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Revenues us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:UnconsolidatedJointVentures


Revenuesus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-30
Value323236374175
Percentage of Revenues10.310.711.712.112.925.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1434.01989.93030.42928.72976.51180.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnconsolidatedJointVentures0.00.00.00.00.00.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value99199566963795519564969196368697819779557711767877077709773377607767773576797651761076017663692269396858684668986932683468076756674368906888691069726942672168045961550155295132
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets dei:LegalEntity

udr:UnitedDominionRealityLP


Assetsdei:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312011-09-302011-06-302010-12-31
Value245723122338236723982355234023632304228123092334239523162349237824152451248225132554278228052843287829062926294029933122312631263136316231783292342631282861
Percentage of Assets25.524.224.524.424.927.128.629.729.929.730.030.331.029.930.230.731.532.032.633.133.340.240.441.542.042.142.243.044.046.246.445.445.545.845.649.050.352.551.7
Percentage of Assets25.524.224.524.424.927.128.629.729.929.730.030.331.029.930.230.731.532.032.633.133.340.240.441.542.042.142.243.044.046.246.445.445.545.845.649.050.352.551.7
Percentage of Assets udr:UnitedDominionRealityLP100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:UnitedDominionRealityLP, udr:UDRLighthouseDownREITL.P.


Assetsdei:
Period End2020-12-312020-09-302019-12-31
Value135713681334
Percentage of Assets14.114.313.8
Percentage of Assets14.114.313.8
Percentage of Assets udr:UnitedDominionRealityLP udr:UDRLighthouseDownREITL.P.100.0100.0100.0

us-gaap:Assets us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:DeveloperCapitalProgramAndOtherInvestments


Assetsus-gaap:
Period End2020-12-312019-12-31
Value687521
Percentage of Assets7.15.4
Percentage of Assets7.15.4
Percentage of Assets udr:DeveloperCapitalProgramAndOtherInvestments100.0100.0

udr:JointVenturesAndPartnershipsExcludingDeveloperCapitalProgram


Assetsus-gaap:
Period End2020-12-312019-12-31
Value14791582
Percentage of Assets15.316.4
Percentage of Assets15.316.4
Percentage of Assets udr:JointVenturesAndPartnershipsExcludingDeveloperCapitalProgram100.0100.0

udr:PreferredEquityInvestmentWestCoastDevelopmentJV


Assetsus-gaap:
Period End2020-12-312019-12-31
Value88147
Percentage of Assets0.91.5
Percentage of Assets0.91.5
Percentage of Assets udr:PreferredEquityInvestmentWestCoastDevelopmentJV100.0100.0

udr:TotalJointVenturesAndPartnerships


Assetsus-gaap:
Period End2020-12-312019-12-31
Value21662103
Percentage of Assets22.521.8
Percentage of Assets22.521.8
Percentage of Assets udr:TotalJointVenturesAndPartnerships100.0100.0

udr:UnconsolidatedJointVentureOneUDRMetLifePartnership


Assetsus-gaap:
Period End2020-12-312019-12-31
Value118123
Percentage of Assets1.21.3
Percentage of Assets1.21.3
Percentage of Assets udr:UnconsolidatedJointVentureOneUDRMetLifePartnership100.0100.0

udr:UnconsolidatedJointVentureOtherMetLife


Assetsus-gaap:
Period End2020-12-312019-12-31
Value603634
Percentage of Assets6.36.6
Percentage of Assets6.36.6
Percentage of Assets udr:UnconsolidatedJointVentureOtherMetLife100.0100.0

udr:UnconsolidatedJointVentureSevenUdrMetlifeIiPartnership


Assetsus-gaap:
Period End2020-12-312019-12-31
Value669677
Percentage of Assets6.97.0
Percentage of Assets6.97.0
Percentage of Assets udr:UnconsolidatedJointVentureSevenUdrMetlifeIiPartnership100.0100.0

udr:UnconsolidatedJointVentures


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value23972301216622042103
Percentage of Assets24.224.122.523.121.8
Percentage of Assets24.224.122.523.121.8
Percentage of Assets udr:UnconsolidatedJointVentures100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value60095560552254575315539352284353422839413816407840163947394939643901379136733824373136573816373537903735382838693982385137773706363837333671362136144152416642653943374138003634
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets60.658.157.357.155.655.754.350.151.649.549.553.152.151.251.151.150.249.047.850.049.048.149.854.054.654.555.956.157.456.455.554.954.054.253.352.451.859.862.062.766.268.068.770.8

us-gaap:Liabilities dei:LegalEntity

udr:UnitedDominionRealityLP


Liabilitiesdei:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312011-09-302011-06-302010-12-31
Value12091072105410371032955910906818530524527520528523706797806813846833110510991114114411701170118711901207119912151217123012231438151515101299
Percentage of Liabilities21.919.719.819.219.821.921.523.021.513.013.113.413.213.313.418.621.721.121.823.121.829.629.029.829.930.229.430.831.532.633.032.633.234.033.934.535.538.334.2
Percentage of Assets12.511.211.010.710.711.011.111.410.66.96.86.86.76.86.79.110.410.510.711.110.916.015.816.316.717.016.917.417.517.917.817.617.717.817.621.422.325.323.5
Percentage of Assets udr:UnitedDominionRealityLP49.246.445.143.843.140.638.938.435.523.222.722.621.722.822.329.733.032.932.833.732.639.739.239.239.840.340.040.439.838.738.338.938.838.938.543.744.248.345.4

us-gaap:Liabilities dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:UnitedDominionRealityLP, udr:UDRLighthouseDownREITL.P.


Liabilitiesdei:
Period End2020-12-312020-09-302019-12-31
Value535534455
Percentage of Liabilities9.79.88.7
Percentage of Assets5.65.64.7
Percentage of Assets udr:UnitedDominionRealityLP udr:UDRLighthouseDownREITL.P.39.539.134.1

us-gaap:Liabilities us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:DeveloperCapitalProgramAndOtherInvestments


Liabilitiesus-gaap:
Period End2020-12-312019-12-31
Value268134
Percentage of Liabilities4.92.6
Percentage of Assets2.81.4
Percentage of Assets udr:DeveloperCapitalProgramAndOtherInvestments39.125.9

udr:JointVenturesAndPartnershipsExcludingDeveloperCapitalProgram


Liabilitiesus-gaap:
Period End2020-12-312019-12-31
Value10151068
Percentage of Liabilities18.420.4
Percentage of Assets10.511.1
Percentage of Assets udr:JointVenturesAndPartnershipsExcludingDeveloperCapitalProgram68.767.5

udr:PreferredEquityInvestmentWestCoastDevelopmentJV


Liabilitiesus-gaap:
Period End2020-12-312019-12-31
Value5593
Percentage of Liabilities1.01.8
Percentage of Assets0.61.0
Percentage of Assets udr:PreferredEquityInvestmentWestCoastDevelopmentJV62.763.8

udr:TotalJointVenturesAndPartnerships


Liabilitiesus-gaap:
Period End2020-12-312019-12-31
Value12841203
Percentage of Liabilities23.323.0
Percentage of Assets13.312.5
Percentage of Assets udr:TotalJointVenturesAndPartnerships59.357.2

udr:UnconsolidatedJointVentureOneUDRMetLifePartnership


Liabilitiesus-gaap:
Period End2020-12-312019-12-31
Value7474
Percentage of Liabilities1.31.4
Percentage of Assets0.80.8
Percentage of Assets udr:UnconsolidatedJointVentureOneUDRMetLifePartnership62.960.7

udr:UnconsolidatedJointVentureOtherMetLife


Liabilitiesus-gaap:
Period End2020-12-312019-12-31
Value462464
Percentage of Liabilities8.48.9
Percentage of Assets4.84.8
Percentage of Assets udr:UnconsolidatedJointVentureOtherMetLife76.773.2

udr:UnconsolidatedJointVentureSevenUdrMetlifeIiPartnership


Liabilitiesus-gaap:
Period End2020-12-312019-12-31
Value423434
Percentage of Liabilities7.78.3
Percentage of Assets4.44.5
Percentage of Assets udr:UnconsolidatedJointVentureSevenUdrMetlifeIiPartnership63.264.2

udr:UnconsolidatedJointVentures


Liabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value12971265128412441203
Percentage of Liabilities21.622.823.322.823.0
Percentage of Assets13.113.213.313.012.5
Percentage of Assets udr:UnconsolidatedJointVentures54.155.059.356.457.2

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value99199566963795519564969196368697819779557711767877077709773377607767773576797651761076017663692269396858684668986932683468076756674368906888691069726942672168045961550155295132
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity dei:LegalEntity

udr:UnitedDominionRealityLP


Liabilities
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312011-09-302011-06-302010-12-31
Value245723122338236723982355234023632304228123092334239523162349237824152451248225132554278228052843287829062926294029933122312631263136316231783292342631282861
Percentage of LiabilitiesAndStockholdersEquity25.524.224.524.424.927.128.629.729.929.730.030.331.029.930.230.731.532.032.633.133.340.240.441.542.042.142.243.044.046.246.445.445.545.845.649.050.352.551.7
Percentage of Assets25.524.224.524.424.927.128.629.729.929.730.030.331.029.930.230.731.532.032.633.133.340.240.441.542.042.142.243.044.046.246.445.445.545.845.649.050.352.551.7
Percentage of Assets udr:UnitedDominionRealityLP100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value27843001323433123397346433583246294929482905259327572877282528452892303630932922294629722899287428572810273527782682274128112828286629312992305131102533231423261826163316061395
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets28.131.433.634.735.535.734.937.336.037.137.733.835.837.336.536.737.239.240.338.238.739.137.841.541.241.039.940.338.740.141.341.942.542.543.444.244.636.534.434.230.629.729.127.2

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value3.371.1721.4090.9270.8330.988.1061.8950.9811.0431851.0841.0551.0832.0381.7881.4112.462.1123.3015.1673.6686.7421.3212.996.2741514261530119.0357.12112821843.558121321119.486108.074195.985123.219
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.10.00.00.02.40.00.00.00.00.00.00.00.00.00.10.00.10.00.00.10.20.20.40.20.40.20.10.10.21.22.60.10.20.20.40.20.20.00.00.00.10.00.0

us-gaap:CashAndCashEquivalentsAtCarryingValue dei:LegalEntity

udr:UnitedDominionRealityLP


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312010-09-302010-06-302009-12-31
Value0.0260.0810.0380.040.0240.040.050.0590.1250.0830.0830.0740.2930.2220.0850.8640.7560.0451.5351.1023.1030.1310.1640.8260.5021.4841.1750.8531.8972.4223.1972.9512.8041.9181.1740.9610.7044.087.6920.920.9240.3580.442
Percentage of CashAndCashEquivalentsAtCarryingValue1.88.74.64.10.32.15.15.70.17.77.96.814.412.46.035.135.81.429.730.046.09.95.513.23.310.24.45.46.321.735.441.423.12.30.627.05.630.335.69.79.14.47.4
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.10.00.00.00.0
Percentage of Assets udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.00.10.00.00.00.00.10.00.00.10.10.10.10.10.10.00.00.00.10.20.00.00.00.0

us-gaap:CashAndCashEquivalentsAtCarryingValue dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:UnitedDominionRealityLP, udr:UDRLighthouseDownREITL.P.


Cash
Period End2020-12-312020-09-302019-12-31
Value0.0230.0230.02
Percentage of CashAndCashEquivalentsAtCarryingValue1.62.50.2
Percentage of Assets0.00.00.0
Percentage of Assets udr:UnitedDominionRealityLP udr:UDRLighthouseDownREITL.P.0.00.00.0

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:DeveloperCapitalProgramAndOtherInvestments


Cash
Period End2020-12-312019-12-31
Value8.2759.633
Percentage of CashAndCashEquivalentsAtCarryingValue587.3118.8
Percentage of Assets0.10.1
Percentage of Assets udr:DeveloperCapitalProgramAndOtherInvestments1.21.8

udr:JointVenturesAndPartnershipsExcludingDeveloperCapitalProgram


Cash
Period End2020-12-312019-12-31
Value1420
Percentage of CashAndCashEquivalentsAtCarryingValue993.8249.1
Percentage of Assets0.10.2
Percentage of Assets udr:JointVenturesAndPartnershipsExcludingDeveloperCapitalProgram0.91.3

udr:TotalJointVenturesAndPartnerships


Cash
Period End2020-12-312019-12-31
Value2229
Percentage of CashAndCashEquivalentsAtCarryingValue1581.1367.9
Percentage of Assets0.20.3
Percentage of Assets udr:TotalJointVenturesAndPartnerships1.01.4

udr:UnconsolidatedJointVentureOneUDRMetLifePartnership


Cash
Period End2020-12-312019-12-31
Value2.5852.317
Percentage of CashAndCashEquivalentsAtCarryingValue183.528.6
Percentage of Assets0.00.0
Percentage of Assets udr:UnconsolidatedJointVentureOneUDRMetLifePartnership2.21.9

udr:UnconsolidatedJointVentureOtherMetLife


Cash
Period End2020-12-312019-12-31
Value7.0497.973
Percentage of CashAndCashEquivalentsAtCarryingValue500.398.4
Percentage of Assets0.10.1
Percentage of Assets udr:UnconsolidatedJointVentureOtherMetLife1.21.3

udr:UnconsolidatedJointVentureSevenUdrMetlifeIiPartnership


Cash
Period End2020-12-312019-12-31
Value4.3694.208
Percentage of CashAndCashEquivalentsAtCarryingValue310.151.9
Percentage of Assets0.00.0
Percentage of Assets udr:UnconsolidatedJointVentureSevenUdrMetlifeIiPartnership0.70.6

udr:UnconsolidatedJointVentures


Cash
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value1828223029
Percentage of CashAndCashEquivalentsAtCarryingValue552.12399.31581.13335.9367.9
Percentage of Assets0.20.30.20.30.3
Percentage of Assets udr:UnconsolidatedJointVentures0.81.21.01.41.4

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value36342424222233232424208283020212221222227
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.40.30.30.20.20.30.30.30.32.70.40.40.30.30.30.30.30.30.4

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents dei:LegalEntity

udr:UnitedDominionRealityLP


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value151514141414141413131313121212131214
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents62.464.263.761.842.162.359.058.26.648.442.762.759.057.858.558.556.352.5
Percentage of Assets0.20.20.20.10.10.20.20.20.20.20.20.20.20.20.20.20.20.2
Percentage of Assets udr:UnitedDominionRealityLP0.60.70.60.60.60.60.60.60.60.60.60.60.50.60.50.50.50.6

Land

us-gaap:Land

us-gaap:Land


Land
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value223221482139214421622163216420201965195418491824185117731780178817881812180117871794176318331790185618391919197017991693
Percentage of Land100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets22.522.522.222.522.622.322.523.224.024.624.023.824.023.023.023.023.023.423.523.423.623.223.926.126.626.528.629.030.230.6

us-gaap:Land dei:LegalEntity

udr:UnitedDominionRealityLP


Landdei:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312012-06-302011-12-31
Value730702711711711711711711711711712712719816814837836832835833833100810131008
Percentage of Land34.132.732.932.932.935.236.236.438.539.038.540.240.445.645.646.246.446.646.647.345.556.354.652.5
Percentage of Assets7.67.47.47.37.48.28.78.99.29.39.29.29.310.510.510.810.910.911.011.010.914.714.515.0
Percentage of Assets udr:UnitedDominionRealityLP29.730.430.430.029.730.230.430.130.931.230.930.530.035.234.735.234.633.933.733.232.635.031.930.6

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:FiniteLivedIntangibleAssetsNet


Finite
Period End2020-12-312019-12-312013-12-312012-12-312011-12-312010-12-31
Value37819.0112113
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.80.10.20.30.2

us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:LeasesAcquiredInPlace


Finite
Period End2020-12-312019-12-31
Value2.63143
Percentage of FiniteLivedIntangibleAssetsNet7.053.5
Percentage of Assets0.00.5
Percentage of Assets us-gaap:LeasesAcquiredInPlace0.00.0

us-gaap:RealEstate


Finite
Period End2020-12-312019-12-31
Value3437
Percentage of FiniteLivedIntangibleAssetsNet93.046.5
Percentage of Assets0.40.4
Percentage of Assets us-gaap:RealEstate0.00.0

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1992002002012022032041359394
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.02.12.12.12.12.12.11.61.11.2

us-gaap:OperatingLeaseRightOfUseAsset dei:LegalEntity

udr:UnitedDominionRealityLP


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2022032032042051359393
Percentage of OperatingLeaseRightOfUseAsset100.8100.7100.7100.6100.799.999.999.8
Percentage of Assets2.12.12.12.12.11.61.11.2
Percentage of Assets udr:UnitedDominionRealityLP8.28.88.78.68.65.84.04.0

Other Assets

us-gaap:OtherAssets

us-gaap:OtherAssets


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1841901881731811791861451401341371401381201241271291141181211261291371149696105117171131137135137133125124124131198129137957467
Percentage of OtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.92.02.01.81.91.91.91.71.71.71.81.81.81.61.61.61.71.51.51.61.71.71.81.71.41.41.51.72.51.92.02.02.01.91.81.81.81.93.01.92.31.71.31.3

us-gaap:OtherAssets dei:LegalEntity

udr:UnitedDominionRealityLP


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312011-09-302011-06-302010-12-31
Value372625242423272434343329323030212423232624242322242522232526283528343241454022
Percentage of OtherAssets19.715.514.113.413.016.119.918.124.724.124.324.426.224.123.618.820.519.218.920.617.921.624.023.522.821.413.017.818.219.820.527.022.827.426.521.135.329.430.7
Percentage of Assets0.40.30.30.20.30.30.30.30.40.40.40.40.40.40.40.30.30.30.30.40.30.40.30.30.40.40.30.30.40.40.40.50.40.50.50.60.70.70.4
Percentage of Assets udr:UnitedDominionRealityLP1.51.21.11.01.01.01.21.01.51.51.51.31.41.31.30.91.01.01.01.11.00.90.80.80.80.90.80.80.80.90.91.10.91.11.01.31.31.30.8

us-gaap:OtherAssets dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:UnitedDominionRealityLP, udr:UDRLighthouseDownREITL.P.


Other
Period End2020-12-312020-09-302019-12-31
Value7.946.7284.829
Percentage of OtherAssets4.23.92.6
Percentage of Assets0.10.10.1
Percentage of Assets udr:UnitedDominionRealityLP udr:UDRLighthouseDownREITL.P.0.60.50.4

us-gaap:OtherAssets us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:DeveloperCapitalProgramAndOtherInvestments


Other
Period End2020-12-312019-12-31
Value128155
Percentage of OtherAssets68.583.4
Percentage of Assets1.31.6
Percentage of Assets udr:DeveloperCapitalProgramAndOtherInvestments18.829.8

udr:JointVenturesAndPartnershipsExcludingDeveloperCapitalProgram


Other
Period End2020-12-312019-12-31
Value2117
Percentage of OtherAssets11.79.4
Percentage of Assets0.20.2
Percentage of Assets udr:JointVenturesAndPartnershipsExcludingDeveloperCapitalProgram1.51.1

udr:TotalJointVenturesAndPartnerships


Other
Period End2020-12-312019-12-31
Value150172
Percentage of OtherAssets80.292.8
Percentage of Assets1.61.8
Percentage of Assets udr:TotalJointVenturesAndPartnerships7.08.2

udr:UnconsolidatedJointVentureOneUDRMetLifePartnership


Other
Period End2020-12-312019-12-31
Value1.6221.053
Percentage of OtherAssets0.90.6
Percentage of Assets0.00.0
Percentage of Assets udr:UnconsolidatedJointVentureOneUDRMetLifePartnership1.40.9

udr:UnconsolidatedJointVentureOtherMetLife


Other
Period End2020-12-312019-12-31
Value6.2145.4
Percentage of OtherAssets3.32.9
Percentage of Assets0.10.1
Percentage of Assets udr:UnconsolidatedJointVentureOtherMetLife1.00.9

udr:UnconsolidatedJointVentureSevenUdrMetlifeIiPartnership


Other
Period End2020-12-312019-12-31
Value149.777
Percentage of OtherAssets7.55.2
Percentage of Assets0.10.1
Percentage of Assets udr:UnconsolidatedJointVentureSevenUdrMetlifeIiPartnership2.11.4

udr:UnconsolidatedJointVentures


Other
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value240162150226172
Percentage of OtherAssets130.485.180.2130.392.8
Percentage of Assets2.41.71.62.41.8
Percentage of Assets udr:UnconsolidatedJointVentures10.07.17.010.38.2

Liabilities Noncurrent

us-gaap:LiabilitiesNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:LiabilitiesNoncurrent

udr:DeveloperCapitalProgramAndOtherInvestments


Liabilities
Period End2020-12-312019-12-31
Value247106
Percentage of LiabilitiesNoncurrent100.0100.0
Percentage of Assets2.61.1
Percentage of Assets udr:DeveloperCapitalProgramAndOtherInvestments36.020.4

udr:JointVenturesAndPartnershipsExcludingDeveloperCapitalProgram


Liabilities
Period End2020-12-312019-12-31
Value9411041
Percentage of LiabilitiesNoncurrent380.8979.1
Percentage of Assets9.810.8
Percentage of Assets udr:JointVenturesAndPartnershipsExcludingDeveloperCapitalProgram63.765.8

udr:TotalJointVenturesAndPartnerships


Liabilities
Period End2020-12-312019-12-31
Value11881148
Percentage of LiabilitiesNoncurrent480.81079.1
Percentage of Assets12.311.9
Percentage of Assets udr:TotalJointVenturesAndPartnerships54.954.6

udr:UnconsolidatedJointVentureOneUDRMetLifePartnership


Liabilities
Period End2020-12-312019-12-31
Value7070
Percentage of LiabilitiesNoncurrent28.766.6
Percentage of Assets0.70.7
Percentage of Assets udr:UnconsolidatedJointVentureOneUDRMetLifePartnership59.957.4

udr:UnconsolidatedJointVentureOtherMetLife


Liabilities
Period End2020-12-312019-12-31
Value454454
Percentage of LiabilitiesNoncurrent183.7427.7
Percentage of Assets4.74.7
Percentage of Assets udr:UnconsolidatedJointVentureOtherMetLife75.371.7

udr:UnconsolidatedJointVentureSevenUdrMetlifeIiPartnership


Liabilities
Period End2020-12-312019-12-31
Value416425
Percentage of LiabilitiesNoncurrent168.4399.8
Percentage of Assets4.34.4
Percentage of Assets udr:UnconsolidatedJointVentureSevenUdrMetlifeIiPartnership62.262.8

udr:UnconsolidatedJointVentures


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value12591193118811941148
Percentage of LiabilitiesNoncurrent0.00.0480.80.01079.1
Percentage of Assets12.712.512.312.511.9
Percentage of Assets udr:UnconsolidatedJointVentures52.551.854.954.254.6

Long Term Debt

us-gaap:LongTermDebt

us-gaap:LongTermDebt


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value545250414976491747664885470739353870358935473811375236803671367936343537340135443465341135703513356435163583362837473628352334633394349934093918
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets55.052.751.651.549.850.448.945.347.245.146.049.648.747.747.547.446.845.744.346.345.544.946.650.751.451.352.352.654.153.151.851.350.350.849.558.3

us-gaap:LongTermDebt dei:LegalEntity

udr:UnitedDominionRealityLP


Long
Period End2020-09-302020-06-302020-03-312019-12-31
Value99999999
Percentage of LongTermDebt2.02.12.02.1
Percentage of Assets1.01.01.01.0
Percentage of Assets udr:UnitedDominionRealityLP4.34.24.24.1

us-gaap:LongTermDebt dei:LegalEntity, us-gaap:DebtInstrument

udr:UnitedDominionRealityLP, udr:FixedRateDebt


Long
Period End2020-09-302020-06-302020-03-312019-12-31
Value72727272
Percentage of LongTermDebt1.51.51.51.5
Percentage of Assets0.80.80.70.7
Percentage of Assets udr:UnitedDominionRealityLP udr:FixedRateDebt0.00.00.00.0

udr:UnitedDominionRealityLP, udr:VariableRateDebt


Long
Period End2020-09-302020-06-302020-03-312019-12-31
Value26262626
Percentage of LongTermDebt0.50.60.60.6
Percentage of Assets0.30.30.30.3
Percentage of Assets udr:UnitedDominionRealityLP udr:VariableRateDebt0.00.00.00.0

us-gaap:LongTermDebt us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType

udr:A3.50MediumTermNoteDueJuly2027, udr:FixedRateDebt, us-gaap:UnsecuredDebt


Long
Period End2021-06-302020-12-31
Value299299
Percentage of LongTermDebt5.56.0
Percentage of Assets3.03.1
Percentage of Assets udr:A3.50MediumTermNoteDueJuly2027 udr:FixedRateDebt us-gaap:UnsecuredDebt0.00.0

udr:A3.50MediumTermNotesDueJanuary2028, udr:FixedRateDebt, us-gaap:UnsecuredDebt


Long
Period End2021-06-302020-12-31
Value299299
Percentage of LongTermDebt5.56.0
Percentage of Assets3.03.1
Percentage of Assets udr:A3.50MediumTermNotesDueJanuary2028 udr:FixedRateDebt us-gaap:UnsecuredDebt0.00.0

udr:A4.00MediumTermNoteDueOctober2025, udr:FixedRateDebt, us-gaap:UnsecuredDebt


Long
Period End2020-12-31
Value299
Percentage of LongTermDebt6.0
Percentage of Assets3.1
Percentage of Assets udr:A4.00MediumTermNoteDueOctober2025 udr:FixedRateDebt us-gaap:UnsecuredDebt0.0

udr:FourPointFourZeroPercentMediumTermNoteDueJanuaryTwoThousandTwentyNine, udr:FixedRateDebt, us-gaap:UnsecuredDebt


Long
Period End2021-06-302020-12-31
Value299299
Percentage of LongTermDebt5.56.0
Percentage of Assets3.03.1
Percentage of Assets udr:FourPointFourZeroPercentMediumTermNoteDueJanuaryTwoThousandTwentyNine udr:FixedRateDebt us-gaap:UnsecuredDebt0.00.0

udr:MediumTerm1.90PercentageNoteDueMarch2033, udr:FixedRateDebt, us-gaap:UnsecuredDebt


Long
Period End2021-06-302020-12-31
Value348348
Percentage of LongTermDebt6.47.0
Percentage of Assets3.53.6
Percentage of Assets udr:MediumTerm1.90PercentageNoteDueMarch2033 udr:FixedRateDebt us-gaap:UnsecuredDebt0.00.0

udr:MediumTerm3.00PercentageNoteDueAugust2031, udr:FixedRateDebt, us-gaap:UnsecuredDebt


Long
Period End2021-06-302020-12-31
Value399398
Percentage of LongTermDebt7.38.0
Percentage of Assets4.04.1
Percentage of Assets udr:MediumTerm3.00PercentageNoteDueAugust2031 udr:FixedRateDebt us-gaap:UnsecuredDebt0.00.0

udr:MediumTerm3.10PercentageNoteDueNovember2034, udr:FixedRateDebt, us-gaap:UnsecuredDebt


Long
Period End2021-06-302020-12-31
Value298298
Percentage of LongTermDebt5.56.0
Percentage of Assets3.03.1
Percentage of Assets udr:MediumTerm3.10PercentageNoteDueNovember2034 udr:FixedRateDebt us-gaap:UnsecuredDebt0.00.0

udr:Others, udr:FixedRateDebt, us-gaap:UnsecuredDebt


Long
Period End2021-06-302020-12-31
Value0.0090.01
Percentage of LongTermDebt0.00.0
Percentage of Assets0.00.0
Percentage of Assets udr:Others udr:FixedRateDebt us-gaap:UnsecuredDebt0.00.0

udr:SeniorUnsecuredMediumTerm2.10PercentNoteDue2033, udr:FixedRateDebt, us-gaap:UnsecuredDebt


Long
Period End2021-06-30
Value298
Percentage of LongTermDebt5.5
Percentage of Assets3.0
Percentage of Assets udr:SeniorUnsecuredMediumTerm2.10PercentNoteDue2033 udr:FixedRateDebt us-gaap:UnsecuredDebt0.0

udr:SeniorUnsecuredMediumTermNotes3.2PercentDueJanuary2030, udr:FixedRateDebt, us-gaap:UnsecuredDebt


Long
Period End2021-06-302020-12-31
Value611612
Percentage of LongTermDebt11.212.3
Percentage of Assets6.26.4
Percentage of Assets udr:SeniorUnsecuredMediumTermNotes3.2PercentDueJanuary2030 udr:FixedRateDebt us-gaap:UnsecuredDebt0.00.0

udr:TaxExemptNotesPayable, udr:VariableRateDebt, us-gaap:SecuredDebt


Long
Period End2021-06-302020-12-31
Value2626
Percentage of LongTermDebt0.50.5
Percentage of Assets0.30.3
Percentage of Assets udr:TaxExemptNotesPayable udr:VariableRateDebt us-gaap:SecuredDebt0.00.0

udr:TwoPointOneZeroPercentMediumTermNoteDueAugust12032, udr:FixedRateDebt, us-gaap:UnsecuredDebt


Long
Period End2021-06-302020-12-31
Value399399
Percentage of LongTermDebt7.38.0
Percentage of Assets4.04.1
Percentage of Assets udr:TwoPointOneZeroPercentMediumTermNoteDueAugust12032 udr:FixedRateDebt us-gaap:UnsecuredDebt0.00.0

us-gaap:Mortgages, udr:FixedRateDebt, us-gaap:SecuredDebt


Long
Period End2021-06-302020-12-31
Value1007824
Percentage of LongTermDebt18.516.6
Percentage of Assets10.28.6
Percentage of Assets us-gaap:Mortgages udr:FixedRateDebt us-gaap:SecuredDebt0.00.0

us-gaap:LongTermDebt us-gaap:DebtInstrument, us-gaap:LongtermDebtType

udr:FixedRateDebt, us-gaap:SecuredDebt


Long
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value89283590610851117112257350350550670367667767968168375475667483195095297197597896910611065106810721075107810821086
Percentage of LongTermDebt17.716.818.422.822.923.814.613.014.114.318.518.018.418.518.518.821.322.219.024.027.926.727.727.427.827.129.328.429.530.431.131.830.931.9
Percentage of Assets9.38.79.511.411.511.66.66.16.46.69.28.88.88.88.88.89.89.88.810.912.512.414.014.014.314.215.415.415.615.815.916.015.715.8
Percentage of Assets udr:FixedRateDebt us-gaap:SecuredDebt0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

udr:VariableRateDebt, us-gaap:SecuredDebt


Long
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value2626262626262694949494123123123123123277374374424424424375375392392337337374369306306343343
Percentage of LongTermDebt0.50.50.50.60.60.60.72.42.62.72.53.33.43.43.43.47.811.010.612.212.411.910.710.511.210.99.39.010.310.58.89.09.810.1
Percentage of Assets0.30.30.30.30.30.30.31.21.21.21.21.61.61.61.61.63.64.94.95.65.65.55.45.45.75.74.94.95.55.44.54.55.05.0
Percentage of Assets udr:VariableRateDebt us-gaap:SecuredDebt0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LongTermDebt us-gaap:FinancialInstrument, us-gaap:LongtermDebtType

udr:FixedRateDebt, us-gaap:SecuredDebt


Long
Period End2021-06-30
Value1032
Percentage of LongTermDebt18.9
Percentage of Assets10.4
Percentage of Assets udr:FixedRateDebt us-gaap:SecuredDebt0.0

udr:VariableRateDebt, us-gaap:SecuredDebt


Long
Period End2021-06-30
Value26
Percentage of LongTermDebt0.5
Percentage of Assets0.3
Percentage of Assets udr:VariableRateDebt us-gaap:SecuredDebt0.0

us-gaap:LongTermDebt us-gaap:LongtermDebtType

us-gaap:SecuredDebt


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value1059919862933111211441149600598599601798799801803804806103111301048125613741376134613501370136113991402144214421381138514251430
Percentage of LongTermDebt19.418.217.319.023.323.424.415.315.516.716.920.921.321.821.921.922.229.233.229.636.240.338.638.337.939.038.038.637.439.840.939.940.840.741.9
Percentage of Assets10.79.68.99.811.611.811.96.97.37.57.810.410.410.410.410.410.413.314.713.716.518.118.019.519.520.019.920.320.221.121.220.520.520.720.8
Percentage of Assets us-gaap:SecuredDebt0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:UnsecuredDebt


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value43924121411439843653374035583335327229902946301229522879286828742828250522702495220920372193216622132145222122282345218520812081200920731979
Percentage of LongTermDebt80.681.882.781.076.776.675.684.784.583.383.179.178.778.278.178.177.870.866.870.463.859.761.461.762.161.062.061.462.660.259.160.159.259.358.1
Percentage of Assets44.343.142.741.738.238.636.938.339.937.638.239.238.337.337.137.036.432.429.632.629.026.828.631.331.931.332.432.333.832.030.630.829.830.128.7
Percentage of Assets us-gaap:UnsecuredDebt0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value201424201714302518131714118.3189.5647.8785.8533.7463.863.0922.1930.8860.8560.8590.860.860.8530.8580.8620.860.8560.8860.9230.920.9163.9914.8294.7864.7344.7013.7753.7383.6873.541
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.30.20.20.10.30.30.20.20.20.20.10.10.10.10.10.00.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.10.10.10.10.10.10.10.1

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

udr:UnitedDominionRealityLP


Lessee
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value1212121212
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.1
Percentage of Assets udr:UnitedDominionRealityLP0.50.50.50.50.5

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType

udr:UnitedDominionRealityLP, udr:EquipmentLeases


Lessee
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value0.1830.1670.1560.1470.156
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo1.41.31.21.21.2
Percentage of Assets0.00.00.00.00.0
Percentage of Assets udr:UnitedDominionRealityLP udr:EquipmentLeases0.00.00.00.00.0

udr:UnitedDominionRealityLP, udr:GroundLeases


Lessee
Period End2020-12-31
Value12
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo98.6
Percentage of Assets0.1
Percentage of Assets udr:UnitedDominionRealityLP udr:GroundLeases0.0

udr:UnitedDominionRealityLP, us-gaap:Land


Lessee
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value121212127.8134.9014.901
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo98.798.898.898.80.00.00.0
Percentage of Assets0.10.10.10.10.10.10.1
Percentage of Assets udr:UnitedDominionRealityLP us-gaap:Land0.00.00.00.00.00.00.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo us-gaap:PropertyPlantAndEquipmentByType

udr:GroundLeases


Lessee
Period End2020-12-31
Value12
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo98.6
Percentage of Assets0.1
Percentage of Assets udr:GroundLeases0.0

us-gaap:Land


Lessee
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1212121212127.8134.9014.901
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo0.00.098.798.898.898.80.00.00.0
Percentage of Assets0.10.10.10.10.10.10.10.10.1
Percentage of Assets us-gaap:Land0.00.00.00.00.00.00.00.00.0

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

udr:UnitedDominionRealityLP


Lessee
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value1212121212
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.1
Percentage of Assets udr:UnitedDominionRealityLP0.50.50.50.50.5

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType

udr:UnitedDominionRealityLP, udr:EquipmentLeases


Lessee
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value0.1870.1710.160.150.159
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree1.51.41.31.21.3
Percentage of Assets0.00.00.00.00.0
Percentage of Assets udr:UnitedDominionRealityLP udr:EquipmentLeases0.00.00.00.00.0

udr:UnitedDominionRealityLP, udr:GroundLeases


Lessee
Period End2020-12-31
Value12
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree98.5
Percentage of Assets0.1
Percentage of Assets udr:UnitedDominionRealityLP udr:GroundLeases0.0

udr:UnitedDominionRealityLP, us-gaap:Land


Lessee
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value121212127.8134.9014.901
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree98.698.798.898.70.00.00.0
Percentage of Assets0.10.10.10.10.10.10.1
Percentage of Assets udr:UnitedDominionRealityLP us-gaap:Land0.00.00.00.00.00.00.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree us-gaap:PropertyPlantAndEquipmentByType

udr:GroundLeases


Lessee
Period End2020-12-31
Value12
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree98.5
Percentage of Assets0.1
Percentage of Assets udr:GroundLeases0.0

us-gaap:Land


Lessee
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1212121212127.8134.9014.901
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree0.00.098.698.798.898.70.00.00.0
Percentage of Assets0.10.10.10.10.10.10.10.10.1
Percentage of Assets us-gaap:Land0.00.00.00.00.00.00.00.00.0

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

udr:UnitedDominionRealityLP


Lessee
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value1212121212
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.1
Percentage of Assets udr:UnitedDominionRealityLP0.50.50.50.50.5

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType

udr:UnitedDominionRealityLP, udr:EquipmentLeases


Lessee
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value0.1910.1740.1630.1530.163
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour1.51.41.31.21.3
Percentage of Assets0.00.00.00.00.0
Percentage of Assets udr:UnitedDominionRealityLP udr:EquipmentLeases0.00.00.00.00.0

udr:UnitedDominionRealityLP, udr:GroundLeases


Lessee
Period End2020-12-31
Value12
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour98.5
Percentage of Assets0.1
Percentage of Assets udr:UnitedDominionRealityLP udr:GroundLeases0.0

udr:UnitedDominionRealityLP, us-gaap:Land


Lessee
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value121212127.8134.9014.901
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour98.698.798.898.70.00.00.0
Percentage of Assets0.10.10.10.10.10.10.1
Percentage of Assets udr:UnitedDominionRealityLP us-gaap:Land0.00.00.00.00.00.00.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour us-gaap:PropertyPlantAndEquipmentByType

udr:GroundLeases


Lessee
Period End2020-12-31
Value12
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour98.5
Percentage of Assets0.1
Percentage of Assets udr:GroundLeases0.0

us-gaap:Land


Lessee
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1212121212127.8134.9014.901
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour0.00.098.698.798.898.70.00.00.0
Percentage of Assets0.10.10.10.10.10.10.10.10.1
Percentage of Assets us-gaap:Land0.00.00.00.00.00.00.00.00.0

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

udr:UnitedDominionRealityLP


Lessee
Period End2020-12-312020-06-302020-03-312019-12-31
Value12121212
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0100.0100.0100.0
Percentage of Assets0.10.10.10.1
Percentage of Assets udr:UnitedDominionRealityLP0.50.50.50.5

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType

udr:UnitedDominionRealityLP, udr:EquipmentLeases


Lessee
Period End2020-12-312020-06-302020-03-312019-12-31
Value0.1950.1670.1560.166
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive1.51.31.21.3
Percentage of Assets0.00.00.00.0
Percentage of Assets udr:UnitedDominionRealityLP udr:EquipmentLeases0.00.00.00.0

udr:UnitedDominionRealityLP, udr:GroundLeases


Lessee
Period End2020-12-31
Value12
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive98.5
Percentage of Assets0.1
Percentage of Assets udr:UnitedDominionRealityLP udr:GroundLeases0.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive us-gaap:PropertyPlantAndEquipmentByType

udr:GroundLeases


Lessee
Period End2020-12-31
Value12
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive98.5
Percentage of Assets0.1
Percentage of Assets udr:GroundLeases0.0

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

udr:UnitedDominionRealityLP


Lessee
Period End2020-12-312020-06-302020-03-312019-12-31
Value443456456456
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0100.0100.0100.0
Percentage of Assets4.64.84.74.7
Percentage of Assets udr:UnitedDominionRealityLP18.119.519.319.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType

udr:UnitedDominionRealityLP, udr:EquipmentLeases


Lessee
Period End2020-12-312020-06-302020-03-312019-12-31
Value0.8130.8520.7950.869
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive0.20.20.20.2
Percentage of Assets0.00.00.00.0
Percentage of Assets udr:UnitedDominionRealityLP udr:EquipmentLeases0.00.00.00.0

udr:UnitedDominionRealityLP, udr:GroundLeases


Lessee
Period End2020-12-31
Value442
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive99.8
Percentage of Assets4.6
Percentage of Assets udr:UnitedDominionRealityLP udr:GroundLeases0.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive us-gaap:PropertyPlantAndEquipmentByType

udr:GroundLeases


Lessee
Period End2020-12-31
Value442
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive99.8
Percentage of Assets4.6
Percentage of Assets udr:GroundLeases0.0

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1941941951961971971981308888
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.02.02.02.12.12.02.11.51.11.1

us-gaap:OperatingLeaseLiability dei:LegalEntity

udr:UnitedDominionRealityLP


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1971971981992001308788
Percentage of OperatingLeaseLiability100.8100.7100.7100.7100.799.999.899.8
Percentage of Assets2.02.12.12.12.11.51.11.1
Percentage of Assets udr:UnitedDominionRealityLP8.08.68.58.48.35.53.83.7

us-gaap:OperatingLeaseLiability dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType

udr:UnitedDominionRealityLP, udr:EquipmentLeases


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value1.5431.4251.3821.321.443
Percentage of OperatingLeaseLiability0.80.70.70.70.7
Percentage of Assets0.00.00.00.00.0
Percentage of Assets udr:UnitedDominionRealityLP udr:EquipmentLeases0.00.00.00.00.0

udr:UnitedDominionRealityLP, udr:GroundLeases


Operating
Period End2020-12-31
Value195
Percentage of OperatingLeaseLiability100.0
Percentage of Assets2.0
Percentage of Assets udr:UnitedDominionRealityLP udr:GroundLeases0.0

udr:UnitedDominionRealityLP, us-gaap:Land


Operating
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1961971971981308788
Percentage of OperatingLeaseLiability100.0100.0100.0100.099.999.899.8
Percentage of Assets2.12.12.02.11.51.11.1
Percentage of Assets udr:UnitedDominionRealityLP us-gaap:Land0.00.00.00.00.00.00.0

us-gaap:OperatingLeaseLiability us-gaap:PropertyPlantAndEquipmentByType

udr:GroundLeases


Operating
Period End2020-12-31
Value195
Percentage of OperatingLeaseLiability100.0
Percentage of Assets2.0
Percentage of Assets udr:GroundLeases0.0

us-gaap:Land


Operating
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1941941961971971981308788
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0100.099.999.899.8
Percentage of Assets2.02.02.12.12.02.11.51.11.1
Percentage of Assets us-gaap:Land0.00.00.00.00.00.00.00.00.0

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

udr:UnitedDominionRealityLP


Lessee
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value506509512515519
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0100.0100.0100.0
Percentage of Assets5.35.35.45.35.4
Percentage of Assets udr:UnitedDominionRealityLP20.622.021.921.821.6

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType

udr:UnitedDominionRealityLP, udr:EquipmentLeases


Lessee
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value1.7481.6181.5751.5091.665
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue0.30.30.30.30.3
Percentage of Assets0.00.00.00.00.0
Percentage of Assets udr:UnitedDominionRealityLP udr:EquipmentLeases0.00.00.00.00.0

udr:UnitedDominionRealityLP, udr:GroundLeases


Lessee
Period End2020-12-31
Value504
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue99.7
Percentage of Assets5.2
Percentage of Assets udr:UnitedDominionRealityLP udr:GroundLeases0.0

udr:UnitedDominionRealityLP, us-gaap:Land


Lessee
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value508511514517403335337
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue99.799.799.799.70.00.00.0
Percentage of Assets5.35.35.35.44.64.14.2
Percentage of Assets udr:UnitedDominionRealityLP us-gaap:Land0.00.00.00.00.00.00.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue us-gaap:PropertyPlantAndEquipmentByType

udr:GroundLeases


Lessee
Period End2020-12-31
Value504
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue99.7
Percentage of Assets5.2
Percentage of Assets udr:GroundLeases0.0

us-gaap:Land


Lessee
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value498501508511514517403335337
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue0.00.099.799.799.799.70.00.00.0
Percentage of Assets5.05.25.35.35.35.44.64.14.2
Percentage of Assets us-gaap:Land0.00.00.00.00.00.00.00.00.0

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

udr:UnitedDominionRealityLP


Lessee
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value309311314316319
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0100.0100.0100.0
Percentage of Assets3.23.33.33.33.3
Percentage of Assets udr:UnitedDominionRealityLP12.613.513.413.413.3

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType

udr:UnitedDominionRealityLP, udr:EquipmentLeases


Lessee
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value0.2050.1930.1930.1890.222
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount0.10.10.10.10.1
Percentage of Assets0.00.00.00.00.0
Percentage of Assets udr:UnitedDominionRealityLP udr:EquipmentLeases0.00.00.00.00.0

udr:UnitedDominionRealityLP, udr:GroundLeases


Lessee
Period End2020-12-31
Value309
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount99.9
Percentage of Assets3.2
Percentage of Assets udr:UnitedDominionRealityLP udr:GroundLeases0.0

udr:UnitedDominionRealityLP, us-gaap:Land


Lessee
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value311314316318273248249
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount99.999.999.999.90.00.00.0
Percentage of Assets3.33.33.33.33.13.03.1
Percentage of Assets udr:UnitedDominionRealityLP us-gaap:Land0.00.00.00.00.00.00.0

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount us-gaap:PropertyPlantAndEquipmentByType

udr:GroundLeases


Lessee
Period End2020-12-31
Value309
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount99.9
Percentage of Assets3.2
Percentage of Assets udr:GroundLeases0.0

us-gaap:Land


Lessee
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value304307311314316318273248249
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount0.00.099.999.999.999.90.00.00.0
Percentage of Assets3.13.23.33.33.33.33.13.03.1
Percentage of Assets us-gaap:Land0.00.00.00.00.00.00.00.00.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value27843001323433123397346433583246294929482905259327572877282528452892303630932922294629722899287428572810273527782682274128112828286629312992305131102533231423261826163316061395
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets28.131.433.634.735.535.734.937.336.037.137.733.835.837.336.536.737.239.240.338.238.739.137.841.541.241.039.940.338.740.141.341.942.542.543.444.244.636.534.434.230.629.729.127.2

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value280530163258333334143478338932712968296229222607276828852835285228983039309629252948297329002875285828112735277926832741281228282867293229933055311425372318233018301637161013981419944
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets28.331.533.834.935.735.935.237.636.237.237.934.035.937.436.736.837.339.340.338.238.739.137.841.541.241.040.040.338.740.141.341.942.542.643.544.244.736.634.534.330.729.829.127.30.00.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:CumulativeEffectPeriodOfAdoption, us-gaap:AdjustmentsForNewAccountingPronouncements

srt:CumulativeEffectPeriodOfAdoptionAdjustment, us-gaap:AccountingStandardsUpdate201609


Stockholders
Period End2020-12-31
Value-2.182
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-0.1
Percentage of Assets-0.0
Percentage of Assets srt:CumulativeEffectPeriodOfAdoptionAdjustment us-gaap:AccountingStandardsUpdate2016090.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:CumulativeEffectPeriodOfAdoption, us-gaap:AdjustmentsForNewAccountingPronouncements, us-gaap:StatementEquityComponents

srt:CumulativeEffectPeriodOfAdoptionAdjustment, us-gaap:AccountingStandardsUpdate201609, us-gaap:AccumulatedDistributionsInExcessOfNetIncome


Stockholders
Period End2020-12-31
Value-2.182
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-0.1
Percentage of Assets-0.0
Percentage of Assets srt:CumulativeEffectPeriodOfAdoptionAdjustment us-gaap:AccountingStandardsUpdate201609 us-gaap:AccumulatedDistributionsInExcessOfNetIncome0.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:DeveloperCapitalProgramAndOtherInvestments


Stockholders
Period End2020-12-312019-12-31
Value418386
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest12.811.4
Percentage of Assets4.34.0
Percentage of Assets udr:DeveloperCapitalProgramAndOtherInvestments60.974.1

udr:JointVenturesAndPartnershipsExcludingDeveloperCapitalProgram


Stockholders
Period End2020-12-312019-12-31
Value463514
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest14.215.2
Percentage of Assets4.85.3
Percentage of Assets udr:JointVenturesAndPartnershipsExcludingDeveloperCapitalProgram31.332.5

udr:PreferredEquityInvestmentWestCoastDevelopmentJV


Stockholders
Period End2020-12-312019-12-31
Value3353
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest1.01.6
Percentage of Assets0.30.6
Percentage of Assets udr:PreferredEquityInvestmentWestCoastDevelopmentJV37.336.2

udr:TotalJointVenturesAndPartnerships


Stockholders
Period End2020-12-312019-12-31
Value881900
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest27.126.6
Percentage of Assets9.19.3
Percentage of Assets udr:TotalJointVenturesAndPartnerships40.742.8

udr:UnconsolidatedJointVentureOneUDRMetLifePartnership


Stockholders
Period End2020-12-312019-12-31
Value4348
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest1.31.4
Percentage of Assets0.50.5
Percentage of Assets udr:UnconsolidatedJointVentureOneUDRMetLifePartnership37.139.3

udr:UnconsolidatedJointVentureOtherMetLife


Stockholders
Period End2020-12-312019-12-31
Value140169
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest4.35.0
Percentage of Assets1.51.8
Percentage of Assets udr:UnconsolidatedJointVentureOtherMetLife23.326.8

udr:UnconsolidatedJointVentureSevenUdrMetlifeIiPartnership


Stockholders
Period End2020-12-312019-12-31
Value245242
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest7.57.2
Percentage of Assets2.62.5
Percentage of Assets udr:UnconsolidatedJointVentureSevenUdrMetlifeIiPartnership36.835.8

udr:UnconsolidatedJointVentures


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value11001036881960900
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest39.234.427.128.826.6
Percentage of Assets11.110.89.110.19.3
Percentage of Assets udr:UnconsolidatedJointVentures45.945.040.743.642.8

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:AccumulatedDistributionsInExcessOfNetIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value-3143.0-2923.073-2685.77-2500.827-2432.882-2360.636-2462.132-2496.328-2336.609-2281.262-2063.996-2075.402-1929.124-1808.907-1871.603-1843.49-1792.674-1644.621-1585.825-1746.617-1712.418-1685.173-1584.459-1610.086-1525.159-1557.953-1528.917-1493.89-1478.814-1414.997-1342.07-1321.202-1279.095-1210.054-1143.781-1082.458-1024.148-1126.561-1142.895-1111.356-1075.499-1045.117-973.864-687.18-448.737-894.072
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-112.0-96.9-82.4-75.0-71.2-67.9-72.6-76.3-78.7-77.0-70.6-79.6-69.7-62.7-66.0-64.6-61.8-54.1-51.2-59.7-58.1-56.7-54.6-56.0-53.4-55.4-55.9-53.8-55.1-51.6-47.7-46.7-44.6-41.3-38.2-35.4-32.9-44.4-49.3-47.7-58.7-63.8-60.5-49.1-31.6-94.7
Percentage of Assets-31.7-30.6-27.9-26.2-25.4-24.4-25.6-28.7-28.5-28.7-26.8-27.0-25.0-23.5-24.2-23.8-23.1-21.3-20.6-22.8-22.5-22.2-20.7-23.3-22.0-22.7-22.3-21.7-21.3-20.7-19.7-19.6-19.0-17.6-16.6-15.7-14.7-16.2-17.0-16.3-18.0-19.0-17.6-13.40.00.0
Percentage of Assets us-gaap:AccumulatedDistributionsInExcessOfNetIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value-8.301-8.614-9.144-10.494-11.94-12.87-10.448-9.022-7.838-2.97-0.0670.202-1.407-1.276-2.681-4.167-4.395-4.288-5.609-11.146-12.974-12.035-12.678-14.187-9.19-15.445-8.855-0.866-2.305-3.704-5.125-6.608-7.811-9.499-11.257-13.073-13.604-13.939-13.902-15.427-10.285-3.696-3.4690.002-11.927-0.77
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-0.3-0.3-0.3-0.3-0.3-0.4-0.3-0.3-0.3-0.1-0.00.0-0.1-0.0-0.1-0.1-0.2-0.1-0.2-0.4-0.4-0.4-0.4-0.5-0.3-0.5-0.3-0.0-0.1-0.1-0.2-0.2-0.3-0.3-0.4-0.4-0.4-0.5-0.6-0.7-0.6-0.2-0.20.0-0.8-0.1
Percentage of Assets-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.0-0.00.0-0.0-0.0-0.0-0.1-0.1-0.1-0.1-0.1-0.2-0.2-0.2-0.2-0.1-0.2-0.1-0.0-0.0-0.1-0.1-0.1-0.1-0.1-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.1-0.10.00.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value5887588558815776579457885781570252445184492046194639463846514643464046354635463146224620444744494342433442234223411441104109410641044101409840984098354333403322278225482450194817171653
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest209.9195.1180.5173.3169.7166.4170.6174.3176.7175.0168.4177.2167.6160.7164.0162.8160.1152.5149.7158.3156.8155.4153.3154.8151.9154.2154.4152.0153.3149.9146.1145.2143.1139.9136.9134.1131.6139.6144.1142.5152.0155.7152.2139.3121.0175.1
Percentage of Assets59.461.561.060.560.659.760.065.664.065.263.860.260.260.260.159.859.759.960.460.560.760.858.064.362.663.261.761.259.460.160.460.860.959.559.559.358.851.049.748.846.746.344.338.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-312009-12-312008-12-31
Value2.9682.9682.9662.9452.9512.9492.9462.9292.8312.8182.7552.6842.6772.6762.6782.6762.6762.6742.6732.6722.6712.6712.6182.622.5912.592.5512.5522.5152.5142.5072.5072.5072.5072.5012.5012.5022.282.1971.8251.5551.374
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value201424201714302518131714118.3189.5647.8785.8533.7463.863.0922.1930.8860.8560.8590.860.860.8530.8580.8620.860.8560.8860.9230.920.9163.9914.8294.7864.7344.7013.7753.7383.6873.5413.353.148
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.70.50.70.60.50.40.90.80.60.50.60.50.40.30.30.30.20.10.10.10.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.20.20.20.20.20.20.20.30.20.3
Percentage of Assets0.20.20.30.20.20.10.30.30.20.20.20.20.10.10.10.10.10.00.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.10.10.10.10.10.10.10.10.00.0
Percentage of Assets us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PreferredStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-312009-12-312008-12-31
Value44444444444646464646464646464646464646464646464646464646464646464646464646128128131132157
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest1.61.51.41.31.31.31.41.41.61.61.61.81.71.61.61.61.61.51.51.61.61.61.61.61.61.71.71.71.71.71.71.61.61.61.61.51.55.15.58.29.511.1
Percentage of Assets0.50.50.50.50.50.50.50.50.60.60.60.60.60.60.60.60.60.60.60.60.60.60.60.70.70.70.70.70.70.70.70.70.70.70.70.70.71.81.92.42.60.0
Percentage of Assets us-gaap:PreferredStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2968000.02968000.02966000.02945000.02951000.02949000.02946000.02929000.02831000.02818000.02755000.02684000.02677000.02676000.02678000.02676000.02676000.02674000.02673000.02672000.02671000.02671000.02618000.02620000.02591000.02590000.02551000.02552000.02515000.02514000.02507000.02507000.02507000.02507000.02501000.02501000.02502000.02280000.02197000.02190000.01967000.01873000.01825000.01555000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital

us-gaap:AdditionalPaidInCapital


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value58875885588157765794578857815702524451844920461946394638465146434640463546354631462246204447444943424334422342234114411041094106410441014098409840983543334033222782254824501948
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets59.461.561.060.560.659.760.065.664.065.263.860.260.260.260.159.859.759.960.460.560.760.858.064.362.663.261.761.259.460.160.460.860.959.559.559.358.851.049.748.846.746.344.338.0

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value-8301000.0-8614000.0-9144000.0-10494000.0-11940000.0-12870000.0-10448000.0-9022000.0-7838000.0-2970000.0-67000.0202000.0-1407000.0-1276000.0-2681000.0-4167000.0-4395000.0-4288000.0-5609000.0-11146000.0-12974000.0-12035000.0-12678000.0-14187000.0-9190000.0-15445000.0-8855000.0-866000.0-2305000.0-3704000.0-5125000.0-6608000.0-7811000.0-9499000.0-11257000.0-13073000.0-13604000.0-13939000.0-13902000.0-15427000.0-10285000.0-3696000.0-3469000.02000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.0-0.00.0-0.0-0.0-0.0-0.1-0.1-0.1-0.1-0.1-0.2-0.2-0.2-0.2-0.1-0.2-0.1-0.0-0.0-0.1-0.1-0.1-0.1-0.1-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.1-0.10.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax dei:LegalEntity

udr:UnitedDominionRealityLP


Accumulated
Period End2020-12-312020-09-302020-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312011-09-302011-06-302010-12-31
Value-49000.0-49000.0-43000.0-53000.0-113000.0-113000.0-113000.0-113000.0-113000.0-329000.0-599000.0-840000.0-1075000.0-1475000.0-2060000.0-2493000.0-3065000.0-3612000.0-4001000.0-4554000.0-5369000.0-6230000.0-6590000.0-6902000.0-7541000.0-5959000.0-5502000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax0.50.50.41.22.01.00.90.90.92.36.55.412.1170.389.467.359.854.751.247.947.747.748.449.648.957.9158.6
Percentage of Assets-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1
Percentage of Assets udr:UnitedDominionRealityLP-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.2-0.2-0.2-0.2-0.2-0.2-0.2

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value201424201714302518131714118.3189.5647.8785.8533.7463.863.0922.1930.8860.8560.8590.860.860.8530.8580.8620.860.8560.8860.9230.920.9163.9914.8294.7864.7344.7013.7753.7383.6873.541
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.30.20.20.10.30.30.20.20.20.20.10.10.10.10.10.00.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.10.10.10.10.10.10.10.1

Stock Issued During Period Value New Issues

us-gaap:StockIssuedDuringPeriodValueNewIssues

us-gaap:StockIssuedDuringPeriodValueNewIssues


Stock
Period End2021-06-302019-12-312019-08-312019-09-302019-06-302019-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-0.3936334944920192-0.027-0.045-0.0171730.12-101.3920.051-108.79-199.84990.00.00.0-0.098-0.2055552001553923094
Percentage of StockIssuedDuringPeriodValueNewIssues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302019-12-312019-09-302019-06-302019-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-0.3936344920192-0.027-0.045-0.017173-420.0163180.051-108.756-199.772-0.098-0.2055552001553823094
Percentage of StockIssuedDuringPeriodValueNewIssues100.0100.0100.0100.0100.0100.0100.0100.0100.0-350013.3-314.4100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:SubsidiarySaleOfStock

udr:ForwardSalesAgreement


Stock
Period End2020-12-312019-12-31
Value10263
Percentage of StockIssuedDuringPeriodValueNewIssues0.099.8
Percentage of Assets0.00.0
Percentage of Assets udr:ForwardSalesAgreement0.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value20612314713918113517317014913715315112213213014811912015315612588120961109510382788810566719778706167674756556041
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9254.17653.612228.811641.114251.19759.18385.32669.25240.44992.15245.45250.13951.34686.6-17.859.348.349.30.00.053.040.156.043.752.746.350.941.742.245.955.135.638.652.243.239.835.235.237.428.427.636.640.528.3

us-gaap:NetCashProvidedByUsedInOperatingActivities dei:LegalEntity

udr:UnitedDominionRealityLP


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-312010-09-30
Value3762526557715768597055705169496449634763575750545448435368424658504528471946
Percentage of NetCashProvidedByUsedInOperatingActivities25.244.928.948.332.941.938.850.038.446.345.253.639.846.441.153.532.140.538.071.747.759.945.556.852.859.055.560.164.963.864.960.264.465.146.670.535.083.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3085.05222.54112.54712.22760.21119.12030.92494.62016.02429.11785.02510.6-7.127.519.926.40.00.020.128.826.726.224.026.326.924.623.427.635.822.725.031.427.825.916.424.89.630.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-355.77641-168.111-130.83752-214.044-303.885-576.809-346.244-459.74989-91.851-86.669-24.586-24.058-100.679-119.881-162.823159-149.147-10.257-64.416-114.238-49.5387.252-21.338-142.865-136.7095.291-92.58765-101.017-150.126-136.955302-224.35333-820.724-209.202-56.858-104.906-356.657-64.822-57.369
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-15939.82541.1-13916.5-10912.24093.4-15421.0-14659.2-9032.4-12170.3-16712.13051.4-3180.4-2787.7-871.23.3-40.1-48.3-66.80.00.0-4.3-29.1-52.9-22.53.5-10.3-70.1-69.02.8-47.833.9-54.0-80.5-73.5167.2-127.519.3-426.2-116.5-33.6-51.0-234.1-43.6-39.1

us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity

udr:UnitedDominionRealityLP


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-312010-09-30
Value-118.387-8.448-7.088-6.116-12.238-12.069-9.941-9.6581.045-8.348-7.38986-75.79-10.342-11.998-7.9528-15.84647-18.65911-16.902-20.24-23.785-31.5062840-28.926-49.122-26.665-30.134-33.90786-17.883120-299.004-15.649-15.561
Percentage of NetCashProvidedByUsedInInvestingActivities70.46.5-13.62.94.02.12.92.11.29.18.5-351.3315.010.310.04.917.910.6-465.529.0-10.034.1-279.1111.522.1-21.1770.331.2-75.526.420.124.828.58.0358.636.414.94.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-9800.2-704.6-556.4-440.6-590.4-189.0-349.4-351.135.6-289.1-237.73060.810.4-4.1-4.8-3.30.00.020.1-8.45.3-7.7-9.7-11.5-15.514.621.9-14.9-25.6-14.2-16.2-18.247.7-10.269.1-155.3-7.6-10.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value150-154.21520-7.416-233.76268139405197137-62.699-62.604-26.117-108.647-105.975-47.815-0.66842-314.321-9.371-110.135-26.052-10.031-55.43-117.015-86.6385039-64.7965.793-168.919297.939-62.092-199.585145-95.8967441521147302-7.29329
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6751.5-9548.91685.3-618.5-18348.74915.46744.26355.76925.35004.7-2136.3-2167.7-840.0-3850.014.5-19.0-0.317.50.00.0-46.4-11.8-4.6-25.2-55.8-41.924.620.1-34.83.0-88.115.74.3-33.3-110.582.6-55.0386.884.66.623.1198.9-4.920.3

us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity

udr:UnitedDominionRealityLP


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-312010-09-30
Value80-53.207-44.893-59.15-45.636-58.895-47.734-58.588-60.125-61.41-47.989-157.01123-58.544-38.467-55.819-77.096-49.04-92.608-45.053-69.79-40.296-30.933-30.33-22.917-78.597-84.942-25.315-19.301-15.741-15.667-23.913-136.268-27.42-152.447247-4.191-30.24
Percentage of NetCashProvidedByUsedInFinancingActivities396.3717.519.2-86.7-32.6-14.5-24.2-42.695.998.1183.7144.5-22.6122.45758.5-130.824.5523.384.1172.9695.772.726.435.0-45.7-197.3131.1-437.011.4-53.6-197.338.568.3-18.9159.033.2-8.8-10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6678.1-4437.6-3523.8-4261.5-2201.4-922.3-1677.8-2129.7-2048.6-2126.4-1543.6-5563.8-3.3-23.3-15.5-22.90.00.0-39.0-20.3-32.3-18.3-14.8-14.7-11.3-39.7-45.6-13.1-10.1-8.4-8.4-12.8-75.4-15.6-87.4128.6-2.0-19.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Amortization Of Financing Costs

us-gaap:AmortizationOfFinancingCosts

us-gaap:AmortizationOfFinancingCosts


Amortization
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1200000.01200000.01100000.01100000.01000000.01100000.01100000.01100000.01000000.01000000.01100000.01100000.01000000.01100000.01100000.01100000.01100000.01000000.01000000.01200000.01300000.02400000.01500000.01500000.01500000.0-2719000.02090000.02247000.02540000.02295000.02163000.01315000.02923000.03096000.01922000.01845000.02094000.0
Percentage of AmortizationOfFinancingCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AmortizationOfFinancingCosts us-gaap:IncomeStatementLocation

us-gaap:InterestExpense


Amortization
Period End2021-06-302020-06-30
Value1200000.01100000.0
Percentage of AmortizationOfFinancingCosts0.0100.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1481461481551571571451291191141081091081091111081101061031071071061069292909390908991858684848985959898928583767573
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepreciationDepletionAndAmortization dei:LegalEntity

udr:UnitedDominionRealityLP


Depreciation
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-312010-09-30
Value363535353535343434353637393739363743444445454444454445454551465154514141
Percentage of DepreciationDepletionAndAmortization24.922.722.622.424.327.229.230.432.032.033.534.235.434.135.734.635.047.647.949.248.349.649.649.449.852.652.453.754.057.154.754.355.652.650.254.3

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value20612314713918113517317014913715315112213213014811912015315612588120961109510382788810566719778706167674756556041
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9254.17653.612228.811641.114251.19759.18385.32669.25240.44992.15245.45250.13951.34686.6-17.859.348.349.30.00.053.040.156.043.752.746.350.941.742.245.955.135.638.652.243.239.835.235.237.428.427.636.640.528.3

us-gaap:NetCashProvidedByUsedInOperatingActivities dei:LegalEntity

udr:UnitedDominionRealityLP


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-312010-09-30
Value3762526557715768597055705169496449634763575750545448435368424658504528471946
Percentage of NetCashProvidedByUsedInOperatingActivities25.244.928.948.332.941.938.850.038.446.345.253.639.846.441.153.532.140.538.071.747.759.945.556.852.859.055.560.164.963.864.960.264.465.146.670.535.083.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3085.05222.54112.54712.22760.21119.12030.92494.62016.02429.11785.02510.6-7.127.519.926.40.00.020.128.826.726.224.026.326.924.623.427.635.822.725.031.427.825.916.424.89.630.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value113.10426-25.258575.22197273524821820816916102523726171016613867365403018363.1885.192-0.268-12.3-9.0311508346-13.25114-27.875-28.456-23.766-26.621-24.056
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax525.1192.22196.4-2106.64534.6376.24710.0426.01252.0890.72798.6644.4662.62897.1-9.56.44.110.60.00.00.00.070.06.040.233.631.219.614.79.319.71.62.7-0.1-6.6-4.883.247.326.7-6.98.2-16.5-13.8-15.6-17.9-16.4

us-gaap:NetIncomeLoss dei:LegalEntity

udr:UnitedDominionRealityLP


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value721819242326272385272491612010135011114.787114144736328.63724304411107.729-0.3490.08551-6.92631-6.6327.476-2.031-8.37-6.845-2.57
Percentage of NetIncomeLoss271.8-73.733.5461.924.698.676.997.7104.6148.8120.2111.888.2128.1106.852.621.342.761.546.169.1110.054.649.249.921.381.4166.3121.2345.4195.6-2884.02.8-0.934.0-8.367.450.051.07.329.428.89.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5969.91553.11520.61737.61157.2420.2962.9870.42926.1959.0796.43239.8-8.38.34.45.60.00.00.00.048.46.622.016.515.64.212.015.423.95.75.34.1-0.20.028.3-3.918.0-3.44.2-1.2-4.1-4.5-1.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:AccumulatedDistributionsInExcessOfNetIncome


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312014-09-302014-06-302014-03-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value113.10426-25.258575.2219727352482182081691610252372617101661365403018-0.268-12.3-9.0311508346-13.25114-27.875
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax525.1192.22196.4-2106.64534.6376.24710.0426.01252.0890.72798.6644.4662.62897.1-9.56.44.110.60.00.00.00.070.06.031.219.614.79.3-0.1-6.6-4.883.247.326.7-6.98.2-16.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedDistributionsInExcessOfNetIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value123.27428-27.217625.54105293826892022897517112825929191117713897667413119383.2355.354-0.309-12.955-9.6761568648-13.78614-28.656-29.317-24.605-27.64-25.026
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax561.6202.72363.5-2270.04874.1399.15076.6460.71346.9967.03053.3701.5721.93161.8-10.37.04.511.60.00.00.00.074.66.241.634.832.320.315.39.620.41.72.8-0.2-6.9-5.286.549.227.6-7.28.3-17.0-14.3-16.2-18.6-17.1

us-gaap:ProfitLoss dei:LegalEntity

udr:UnitedDominionRealityLP


Profit
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30
Value721919242427272486282591612111145011115.131115144736328.87524304811107.774-0.3010.12451-6.89231-6.67.508-8.373-6.836-2.552
Percentage of ProfitLoss254.1-70.032.0444.823.392.772.691.596.3138.9112.2102.981.4120.1101.249.319.640.358.244.265.3109.253.148.148.521.179.1162.1128.7341.6190.9-2515.92.3-1.332.9-8.065.147.950.428.627.89.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6005.01589.41558.91775.21185.1427.2977.5884.62941.2974.2809.93254.6-8.48.44.55.70.00.00.00.048.76.822.116.715.74.312.115.626.25.75.34.2-0.20.128.4-3.918.0-3.44.2-4.1-4.5-1.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ProfitLoss dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:UnitedDominionRealityLP, udr:UDRLighthouseDownREITL.P.


Profit
Period End2020-12-312020-09-302019-12-312019-09-30
Value-0.475-3.343-2.784-3.381
Percentage of ProfitLoss-1.712.3-2.6-11.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-39.3-278.8-134.3-52.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP udr:UDRLighthouseDownREITL.P.0.00.00.00.0

us-gaap:ProfitLoss us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:UnconsolidatedJointVentures


Profit
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-30
Value2928-7.24525-0.581124
Percentage of ProfitLoss239.3856.126.640.6-10.5421.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1343.81735.5-604.31978.9-41.91942.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnconsolidatedJointVentures0.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value6.3984.9124.534.2784.06.808112.7044.3795.9373.553.6123.5783.5042.793.2393.4543.3792.8623.4613.1963.8793.5785.3794.84.26
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-355.77641-168.111-130.83752-214.044-303.885-576.809-346.244-459.74989-91.851-86.669-24.586-24.058-100.679-119.881-162.823159-149.147-10.257-64.416-114.238-49.5387.252-21.338-142.865-136.7095.291-92.58765-101.017-150.126-136.955302-224.35333-820.724-209.202-56.858-104.906-356.657-64.822-57.369
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-15939.82541.1-13916.5-10912.24093.4-15421.0-14659.2-9032.4-12170.3-16712.13051.4-3180.4-2787.7-871.23.3-40.1-48.3-66.80.00.0-4.3-29.1-52.9-22.53.5-10.3-70.1-69.02.8-47.833.9-54.0-80.5-73.5167.2-127.519.3-426.2-116.5-33.6-51.0-234.1-43.6-39.1

us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity

udr:UnitedDominionRealityLP


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-312010-09-30
Value-118.387-8.448-7.088-6.116-12.238-12.069-9.941-9.6581.045-8.348-7.38986-75.79-10.342-11.998-7.9528-15.84647-18.65911-16.902-20.24-23.785-31.5062840-28.926-49.122-26.665-30.134-33.90786-17.883120-299.004-15.649-15.561
Percentage of NetCashProvidedByUsedInInvestingActivities70.46.5-13.62.94.02.12.92.11.29.18.5-351.3315.010.310.04.917.910.6-465.529.0-10.034.1-279.1111.522.1-21.1770.331.2-75.526.420.124.828.58.0358.636.414.94.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-9800.2-704.6-556.4-440.6-590.4-189.0-349.4-351.135.6-289.1-237.73060.810.4-4.1-4.8-3.30.00.020.1-8.45.3-7.7-9.7-11.5-15.514.621.9-14.9-25.6-14.2-16.2-18.247.7-10.269.1-155.3-7.6-10.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value150-154.21520-7.416-233.76268139405197137-62.699-62.604-26.117-108.647-105.975-47.815-0.66842-314.321-9.371-110.135-26.052-10.031-55.43-117.015-86.6385039-64.7965.793-168.919297.939-62.092-199.585145-95.8967441521147302-7.29329
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6751.5-9548.91685.3-618.5-18348.74915.46744.26355.76925.35004.7-2136.3-2167.7-840.0-3850.014.5-19.0-0.317.50.00.0-46.4-11.8-4.6-25.2-55.8-41.924.620.1-34.83.0-88.115.74.3-33.3-110.582.6-55.0386.884.66.623.1198.9-4.920.3

us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity

udr:UnitedDominionRealityLP


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-312010-09-30
Value80-53.207-44.893-59.15-45.636-58.895-47.734-58.588-60.125-61.41-47.989-157.01123-58.544-38.467-55.819-77.096-49.04-92.608-45.053-69.79-40.296-30.933-30.33-22.917-78.597-84.942-25.315-19.301-15.741-15.667-23.913-136.268-27.42-152.447247-4.191-30.24
Percentage of NetCashProvidedByUsedInFinancingActivities396.3717.519.2-86.7-32.6-14.5-24.2-42.695.998.1183.7144.5-22.6122.45758.5-130.824.5523.384.1172.9695.772.726.435.0-45.7-197.3131.1-437.011.4-53.6-197.338.568.3-18.9159.033.2-8.8-10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6678.1-4437.6-3523.8-4261.5-2201.4-922.3-1677.8-2129.7-2048.6-2126.4-1543.6-5563.8-3.3-23.3-15.5-22.90.00.0-39.0-20.3-32.3-18.3-14.8-14.7-11.3-39.7-45.6-13.1-10.1-8.4-8.4-12.8-75.4-15.6-87.4128.6-2.0-19.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Payments Of Dividends Common Stock

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsOfDividendsCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value107106106106106100100979688868686838382827878787872727171666665655858585955555550474339343333302928
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2020-12-312020-09-30
Value0.019
Percentage of PaymentsForRepurchaseOfCommonStock0.0100.0

Debt Instrument Interest Rate Stated Percentage

us-gaap:DebtInstrumentInterestRateStatedPercentage dei:LegalEntity, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentInterestRateStatedPercentage

udr:UnitedDominionRealityLP, udr:SecuredDebtAt4.64DueIn2023


Debt
Period End2020-07-21
Value0.0464
Percentage of DebtInstrumentInterestRateStatedPercentage100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations udr:UnitedDominionRealityLP udr:SecuredDebtAt4.64DueIn20230.0

udr:UnitedDominionRealityLP, udr:TwoPointOneZeroPercentMediumTermNoteDueAugust12032


Debt
Period End2020-07-21
Value0.021
Percentage of DebtInstrumentInterestRateStatedPercentage45.3
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations udr:UnitedDominionRealityLP udr:TwoPointOneZeroPercentMediumTermNoteDueAugust120320.0

us-gaap:DebtInstrumentInterestRateStatedPercentage dei:LegalEntity, us-gaap:LongtermDebtType, us-gaap:TypeOfArrangement

udr:UnitedDominionRealityLP, udr:A3.75MTNDueJuly2024, udr:CashTenderOffer


Debt
Period End2020-07-14
Value0.0375
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations udr:UnitedDominionRealityLP udr:A3.75MTNDueJuly2024 udr:CashTenderOffer0.0

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument

udr:MediumTerm1.90PercentageNoteDueMarch2033


Debt
Period End2020-12-31
Value1.9
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations udr:MediumTerm1.90PercentageNoteDueMarch20330.0

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument, us-gaap:LongtermDebtType

udr:FixedRateDebt, udr:MortgageNotePayableMaturesOn2031


Debt
Period End2020-07-31
Value2.62
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations udr:FixedRateDebt udr:MortgageNotePayableMaturesOn20310.0

udr:FixedRateDebt, udr:MortgageNotePayableMaturesOnNovember2020


Debt
Period End2020-07-312020-06-30
Value4.350.0435
Percentage of DebtInstrumentInterestRateStatedPercentage0.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations udr:FixedRateDebt udr:MortgageNotePayableMaturesOnNovember20200.00.0

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument, us-gaap:RealEstateProperties

udr:FixedRateDebt, udr:HomeOperatingCommunity300FranklinMa


Debt
Period End2021-01-31
Value4.39
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations udr:FixedRateDebt udr:HomeOperatingCommunity300FranklinMa0.0

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:LongtermDebtType

udr:SecuredDebtAt4.64DueIn2023


Debt
Period End2020-07-312020-07-21
Value4.640.0464
Percentage of DebtInstrumentInterestRateStatedPercentage0.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations udr:SecuredDebtAt4.64DueIn20230.00.0

udr:TwoPointOneZeroPercentMediumTermNoteDueAugust12032


Debt
Period End2020-07-312020-07-21
Value2.10.021
Percentage of DebtInstrumentInterestRateStatedPercentage0.045.3
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations udr:TwoPointOneZeroPercentMediumTermNoteDueAugust120320.00.0

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:LongtermDebtType, us-gaap:TypeOfArrangement

udr:A3.75MTNDueJuly2024, udr:CashTenderOffer


Debt
Period End2020-07-312020-07-14
Value3.750.0375
Percentage of DebtInstrumentInterestRateStatedPercentage0.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations udr:A3.75MTNDueJuly2024 udr:CashTenderOffer0.00.0

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:RealEstateProperties, us-gaap:SubsequentEventType

udr:HomeOperatingCommunity300FranklinMa, us-gaap:SubsequentEvent


Debt
Period End2021-01-31
Value4.39
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations udr:HomeOperatingCommunity300FranklinMa us-gaap:SubsequentEvent0.0

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

srt:ScenarioForecast, udr:FixedRateDebt, udr:MortgageNotePayableMaturesOn2031


Debt
Period End2020-09-30
Value0.0262
Percentage of DebtInstrumentInterestRateStatedPercentage0.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:ScenarioForecast udr:FixedRateDebt udr:MortgageNotePayableMaturesOn20310.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-312011-12-312010-12-312009-12-31
Value600000.0600000.03200000.02800000.02800000.01400000.01600000.01300000.0100000.00640000.0291000.0
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0

us-gaap:DeferredTaxLiabilities us-gaap:ConsolidatedEntities

udr:TRS


Deferred
Period End2020-12-312019-12-312018-12-31
Value3240000.01635000.02000.0
Percentage of DeferredTaxLiabilities101.2102.22.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet us-gaap:ConsolidatedEntities

us-gaap:DeferredTaxAssetsNet

udr:TRS


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value0.130.090.0820.1380.72
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance us-gaap:ConsolidatedEntities

us-gaap:DeferredTaxAssetsValuationAllowance

udr:TRS


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value0.0230.0190.0160.0090.006
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0

udr:AdjustmentToProfitLossCovid19Pandemic

udr:AdjustmentToProfitLossCovid19Pandemic


Adjustment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value-100000.0-400000.0-200000.0-400000.0-500000.0
Percentage of AdjustmentToProfitLossCovid19Pandemic100.0100.0100.0100.0100.0

udr:AdjustmentToRentalIncomeCovid19Pandemic

udr:AdjustmentToRentalIncomeCovid19Pandemic


Adjustment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value-700000.0-5100000.0-5500000.0-4400000.0-8500000.0
Percentage of AdjustmentToRentalIncomeCovid19Pandemic100.0100.0100.0100.0100.0

udr:AdjustmentToRentalIncomeCovid19Pandemic dei:LegalEntity

udr:UnitedDominionRealityLP


Adjustment
Period End2020-12-312020-09-302020-06-30
Value-2400000.0-2000000.0-4600000.0
Percentage of AdjustmentToRentalIncomeCovid19Pandemic43.645.554.1

udr:AdjustmentToRentalIncomeCovid19Pandemic dei:LegalEntity, us-gaap:FinancingReceivablePortfolioSegment

udr:UnitedDominionRealityLP, udr:MultifamilyTenantLease


Adjustment
Period End2020-09-30
Value-1600000.0
Percentage of AdjustmentToRentalIncomeCovid19Pandemic36.4

udr:UnitedDominionRealityLP, udr:RetailTenantLease


Adjustment
Period End2020-09-30
Value-400000.0
Percentage of AdjustmentToRentalIncomeCovid19Pandemic9.1

udr:AmountOfPrivateOrPublicCapitalThatMustBeRaisedForNoteReceivableToMature us-gaap:FinancingReceivablePortfolioSegment

udr:AmountOfPrivateOrPublicCapitalThatMustBeRaisedForNoteReceivableToMature

udr:NoteDueJanuary2023


Amount
Period End2021-06-302021-03-312020-12-31
Value0.05.00.0
Percentage of AmountOfPrivateOrPublicCapitalThatMustBeRaisedForNoteReceivableToMature0.0100.00.0

udr:CasualtyRelatedRecoveriesChargesNet

udr:CasualtyRelatedRecoveriesChargesNet


Casualty
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-30
Value-2463000.05577000.0778000.00102000.01251000.01316000.0-1088000.0246000.0-243000.0678000.0
Percentage of CasualtyRelatedRecoveriesChargesNet100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0

udr:CasualtyRelatedRecoveriesChargesNet dei:LegalEntity

udr:UnitedDominionRealityLP


Casualty
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-30
Value605000.00190000.0-2000.02022000.0-1088000.0-81000.045000.0-10000.0
Percentage of CasualtyRelatedRecoveriesChargesNet77.80.0186.3-0.2153.6100.0-32.9-18.5-1.5

udr:DebtInstrumentRedemptionExpensesIncurred us-gaap:LongtermDebtType

udr:DebtInstrumentRedemptionExpensesIncurred

udr:A3.75MTNDueJuly2024


Debt
Period End2020-12-31
Value21
Percentage of DebtInstrumentRedemptionExpensesIncurred100.0

udr:DevelopmentCostsExcludingDirectCostsAndCapitalizedInterest

udr:DevelopmentCostsExcludingDirectCostsAndCapitalizedInterest


Development
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value2.24.61.71.61.86.91.51.91.83.30.91.61.63.42.22.21.72.8
Percentage of DevelopmentCostsExcludingDirectCostsAndCapitalizedInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

udr:DevelopmentCostsExcludingDirectCostsAndCapitalizedInterest dei:LegalEntity

udr:UnitedDominionRealityLP


Development
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-09-302017-12-312017-06-30
Value0.10.20.20.40.20.30.30.00.10.1
Percentage of DevelopmentCostsExcludingDirectCostsAndCapitalizedInterest5.912.511.15.813.315.816.70.04.55.9

udr:ForwardPricePerShare us-gaap:SubsidiarySaleOfStock

udr:ForwardPricePerShare

udr:ForwardSalesAgreement


Forward
Period End2021-06-302021-03-31
Value49.2243.51
Percentage of ForwardPricePerShare100.0100.0

udr:ForwardSalesAgreementCommonStockCapitalSharesReservedForFutureIssuance us-gaap:SubsidiarySaleOfStock

udr:ForwardSalesAgreementCommonStockCapitalSharesReservedForFutureIssuance

udr:AtMarketOffering


Forward
Period End2021-06-30
Value2600000.0
Percentage of ForwardSalesAgreementCommonStockCapitalSharesReservedForFutureIssuance100.0

udr:IncomeFromParticipatingLoan

udr:IncomeFromParticipatingLoan


Income
Period End2021-06-302021-03-312020-06-302020-03-31
Value9.7515958.0213.367
Percentage of IncomeFromParticipatingLoan100.0100.0100.0100.0

udr:IncomeFromParticipatingLoan us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty

udr:OperatingCommunity


Income
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-4.359-4.055-4.491-3.016-2.4333.3322.052-3.887
Percentage of IncomeFromParticipatingLoan-44.7-0.70.0-37.6-72.30.00.00.0

udr:IncomeFromParticipatingLoan us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:DevelopmentCommunity, udr:OtherInvestmentPortalsWashingtonDc


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1.5731.4481.3891.3351.3181.2871.2341.1731.1691.015
Percentage of IncomeFromParticipatingLoan0.00.017.339.60.00.00.00.00.00.0

udr:DevelopmentCommunity, udr:OtherInvestmentVentures


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.599-0.2124.696-0.15-0.2194.247-0.10.125-0.005-0.077
Percentage of IncomeFromParticipatingLoan0.00.058.5-4.50.00.00.00.00.00.0

udr:DevelopmentCommunity, udr:PreferredEquityInvestment1200BroadwayNashvilleTn


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1.7271.3721.3751.3471.3061.2811.2691.2441.2061.1691.10.859
Percentage of IncomeFromParticipatingLoan17.70.20.00.016.338.00.00.00.00.00.00.0

udr:DevelopmentCommunity, udr:PreferredEquityInvestment1300FairmountPhiladelphiaPa


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1.2751.2551.2561.231.1911.1661.3740.930.5190.2750.1320.027
Percentage of IncomeFromParticipatingLoan13.10.20.00.014.834.60.00.00.00.00.00.0

udr:DevelopmentCommunity, udr:PreferredEquityInvestment1532HarrisonSanFranciscoCa


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.9630.9290.9620.8750.8460.8360.8230.8020.7740.7480.7360.721
Percentage of IncomeFromParticipatingLoan9.90.20.00.010.524.80.00.00.00.00.00.0

udr:DevelopmentCommunity, udr:PreferredEquityInvestment1641LincolnSantaMonicaCa


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.3640.350.3470.3370.3230.3140.3080.2990.2870.2750.2650.141
Percentage of IncomeFromParticipatingLoan3.70.10.00.04.09.30.00.00.00.00.00.0

udr:DevelopmentCommunity, udr:PreferredEquityInvestmentAllenTexas


Income
Period End2021-06-302021-03-31
Value0.2260.002
Percentage of IncomeFromParticipatingLoan2.30.0

udr:DevelopmentCommunity, udr:PreferredEquityInvestmentEssexOrlandoFl


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.5430.5220.5170.5010.4810.4660.4570.4430.4070.3320.2120.046
Percentage of IncomeFromParticipatingLoan5.60.10.00.06.013.80.00.00.00.00.00.0

udr:DevelopmentCommunity, udr:PreferredEquityInvestmentHerndonVirginia


Income
Period End2021-06-302021-03-31
Value0.1710.096
Percentage of IncomeFromParticipatingLoan1.80.0

udr:DevelopmentCommunity, udr:PreferredEquityInvestmentHillsboroOregon


Income
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value0.00.0-0.046-0.237-0.01-0.161
Percentage of IncomeFromParticipatingLoan0.00.0-1.40.00.00.0

udr:DevelopmentCommunity, udr:PreferredEquityInvestmentModeraLakeMerrittOakland


Income
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value0.7140.6910.6750.6520.5740.3660.256
Percentage of IncomeFromParticipatingLoan7.30.10.08.117.00.00.0

udr:DevelopmentCommunity, udr:PreferredEquityInvestmentQueensNewYork


Income
Period End2021-06-302021-03-312020-09-30
Value1.4311.3720.99
Percentage of IncomeFromParticipatingLoan14.70.20.0

udr:DevelopmentCommunity, udr:PreferredEquityInvestmentThousandOaksCa


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value0.4810.4380.3460.240.1530.024
Percentage of IncomeFromParticipatingLoan4.90.10.00.01.90.7

udr:DevelopmentCommunity, udr:PreferredEquityInvestmentsAndOtherInvestments


Income
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-30
Value9.0247.431115.7379.3814.573
Percentage of IncomeFromParticipatingLoan0.00.0137.60.00.00.0

udr:DevelopmentCommunity, udr:PreferredEquityInvestmentsAndRealEstateTechnologyInvestments


Income
Period End2021-06-302021-03-312020-06-302020-03-31
Value148.9779.6484.511
Percentage of IncomeFromParticipatingLoan144.71.5120.3134.0

udr:DevelopmentCommunity, udr:RealEstateTechnologyInvestmentsRetvI


Income
Period End2021-06-302021-03-312020-06-302020-03-31
Value6.0552.0514.696-0.15
Percentage of IncomeFromParticipatingLoan62.10.358.5-4.5

udr:DevelopmentCommunity, udr:RealEstateTechnologyInvestmentsRetvIi


Income
Period End2021-06-302021-03-31
Value0.163-0.101
Percentage of IncomeFromParticipatingLoan1.7-0.0

udr:OperatingCommunity, udr:UnconsolidatedJointVentureOneUDRMetLifePartnership


Income
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-0.839-0.475-0.751-0.658-0.454-0.5-0.548-0.576
Percentage of IncomeFromParticipatingLoan-8.6-0.10.0-8.2-13.50.00.00.0

udr:OperatingCommunity, udr:UnconsolidatedJointVentureOtherMetLife


Income
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-3.367-3.382-3.151-2.312-1.811-1.205-1.684-1.777
Percentage of IncomeFromParticipatingLoan-34.5-0.60.0-28.8-53.80.00.00.0

udr:OperatingCommunity, udr:UnconsolidatedJointVentureSevenUdrMetlifeIiPartnership


Income
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-0.153-2.684-0.4410.01-0.0910.7020.7760.434
Percentage of IncomeFromParticipatingLoan-1.6-0.50.00.1-2.70.00.00.0

udr:OperatingCommunity, udr:UnconsolidatedJointVentureWestCoastDevelopmentJv


Income
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value0.02.486-0.148-0.056-0.077-0.229-0.359-0.149
Percentage of IncomeFromParticipatingLoan0.00.40.0-0.7-2.30.00.00.0

udr:IncomeTaxExpenseBenefitOfReitSubsidiaryNetIncludingDiscontinuedOperations

udr:IncomeTaxExpenseBenefitOfReitSubsidiaryNetIncludingDiscontinuedOperations


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value135000.0619000.0668000.0187000.01526000.0164000.02000.01499000.0125000.02212000.070000.0158000.0233000.0227000.0-1065000.0127000.0366000.0332000.0-3063000.094000.0-402000.0-403000.0-1424000.0-633000.0-1404000.0-425000.0-7087000.0-2490000.0-2230000.0-3329000.015000.0-2658000.0-2683000.0-1973000.06787000.0-2960000.0-2027000.0-22876000.07398000.059000.00
Percentage of IncomeTaxExpenseBenefitOfReitSubsidiaryNetIncludingDiscontinuedOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

udr:InterestAndOtherIncomeIncludingDiscontinuedOperations

udr:InterestAndOtherIncomeIncludingDiscontinuedOperations


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value2.5362.057-1.032.1832.4212.72.4061.8751.319.8131.661.188
Percentage of InterestAndOtherIncomeIncludingDiscontinuedOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

udr:LimitedPartnersCapitalAccountUnitDividendRatePercentage us-gaap:LimitedPartnersCapitalAccountByClass

udr:LimitedPartnersCapitalAccountUnitDividendRatePercentage

udr:ClassLimitedPartner


Limited
Period End2020-12-31
Value0
Percentage of LimitedPartnersCapitalAccountUnitDividendRatePercentage0.0

udr:LimitedPartnersCapitalAccountUnitValue1 us-gaap:LimitedPartnersCapitalAccountByClass

udr:LimitedPartnersCapitalAccountUnitValue1

udr:ClassLimitedPartner


Limited
Period End2020-12-31
Value0
Percentage of LimitedPartnersCapitalAccountUnitValue10.0

udr:LongTermDebtPriceAsPercentageOfPrincipalAmount dei:LegalEntity, us-gaap:LongtermDebtType

udr:LongTermDebtPriceAsPercentageOfPrincipalAmount

udr:UnitedDominionRealityLP, udr:TwoPointOneZeroPercentMediumTermNoteDueAugust12032


Long
Period End2020-07-21
Value99.894
Percentage of LongTermDebtPriceAsPercentageOfPrincipalAmount100.0

udr:LongTermDebtPriceAsPercentageOfPrincipalAmount us-gaap:DebtInstrument

udr:MediumTerm1.90PercentageNoteDueMarch2033


Long
Period End2020-12-31
Value99.578
Percentage of LongTermDebtPriceAsPercentageOfPrincipalAmount0.0

udr:LongTermDebtPriceAsPercentageOfPrincipalAmount us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

udr:SeniorUnsecuredMediumTerm2.10PercentNoteDue2033, us-gaap:SubsequentEvent


Long
Period End2021-02-11
Value99.592
Percentage of LongTermDebtPriceAsPercentageOfPrincipalAmount0.0

udr:LongTermIncentivePlanOperatingPartnershipUnitGrantsValue dei:LegalEntity

udr:LongTermIncentivePlanOperatingPartnershipUnitGrantsValue

udr:UnitedDominionRealityLP


Long
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value3.4473.4443.135.5345.0866.5635.385102.8752.9322.9237.1091.6362.0682.0681.9910.7561.0081.3080.6630.00.00.00.0
Percentage of LongTermIncentivePlanOperatingPartnershipUnitGrantsValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0

udr:LongTermIncentivePlanOperatingPartnershipUnitGrantsValue dei:LegalEntity, us-gaap:PartnerCapitalComponents

udr:UnitedDominionRealityLP, udr:PartnershipCapital


Long
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value3.4473.4443.135.5345.0866.5635.385102.8752.9322.9237.1091.6362.0682.0681.9913.7350.0-0.6630.663
Percentage of LongTermIncentivePlanOperatingPartnershipUnitGrantsValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0494.00.0-50.7100.0

udr:LongTermIncentivePlanOperatingPartnershipUnitGrantsValue dei:LegalEntity, us-gaap:PartnerTypeOfPartnersCapitalAccount

udr:UnitedDominionRealityLP, udr:LimitedPartners


Long
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value3.4473.4443.135.5345.0866.5635.385102.8752.9322.9237.1091.6362.0682.0681.9913.7350.0-0.6630.663
Percentage of LongTermIncentivePlanOperatingPartnershipUnitGrantsValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0494.00.0-50.7100.0

udr:LongTermIncentivePlanOperatingPartnershipUnitVestingValue

udr:LongTermIncentivePlanOperatingPartnershipUnitVestingValue


Long
Period End2021-06-302021-03-312020-12-31
Value-0.002140.0
Percentage of LongTermIncentivePlanOperatingPartnershipUnitVestingValue100.0100.00.0

udr:LongTermIncentivePlanOperatingPartnershipUnitsVestingShares

udr:LongTermIncentivePlanOperatingPartnershipUnitsVestingShares


Long
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value000772000.01.0010420.0416580.0000285620.000072226.0
Percentage of LongTermIncentivePlanOperatingPartnershipUnitsVestingShares0.00.00.0100.0100.00.0100.0100.00.00.00.0100.00.00.00.0100.0

udr:LongTermIncentivePlanOperatingPartnershipUnitsVestingShares us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner


Long
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value000772000.01.0010420.0416580.0381.000285620.0
Percentage of LongTermIncentivePlanOperatingPartnershipUnitsVestingShares0.00.00.0100.0100.00.0100.0100.00.00.00.0100.0

udr:LongTermIncentivePlanUnitGrantsVestingsNet

udr:LongTermIncentivePlanUnitGrantsVestingsNet


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value6.222-9.6013.6453.1583.329-16.4875.5316.5625.202-3.9252.8762.9312.922-1.424
Percentage of LongTermIncentivePlanUnitGrantsVestingsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

udr:LongTermIncentivePlanUnitGrantsVestingsNet us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value6.222-9.6013.6453.1583.329-16.4875.5316.5625.202-3.9252.8762.9312.922-1.424
Percentage of LongTermIncentivePlanUnitGrantsVestingsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

udr:NonCashLongTermIncentivePlanOperatingPartnershipUnitGrantsValue dei:LegalEntity

udr:NonCashLongTermIncentivePlanOperatingPartnershipUnitGrantsValue

udr:UnitedDominionRealityLP


Non
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value3.4473.4443.135.5345.0866.5635.385102.8752.9322.9237.1091.636
Percentage of NonCashLongTermIncentivePlanOperatingPartnershipUnitGrantsValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

udr:NotesReceivableCancellation

udr:NotesReceivableCancellation


Notes
Period End2020-12-312020-09-302020-06-302020-03-31
Value0002250000.0
Percentage of NotesReceivableCancellation0.00.00.0100.0

udr:NotesReceivableIncrease us-gaap:FinancingReceivablePortfolioSegment

udr:NotesReceivableIncrease

udr:NoteDueJanuary2023


Notes
Period End2021-06-302021-03-312020-12-31
Value1100000.01200000.0900000.0
Percentage of NotesReceivableIncrease100.0100.0100.0

udr:OperatingLeaseLiabilitiesAmortization

udr:OperatingLeaseLiabilitiesAmortization


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value700000.0800000.0800000.0700000.0800000.0700000.0500000.0100000.0100000.0100000.0
Percentage of OperatingLeaseLiabilitiesAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

udr:OperatingLeaseLiabilitiesAmortization dei:LegalEntity

udr:UnitedDominionRealityLP


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value1000000.0700000.0600000.0900000.0400000.0100000.0
Percentage of OperatingLeaseLiabilitiesAmortization125.0100.075.0128.680.0100.0

udr:OperatingLeaseOtherIncome dei:LegalEntity, us-gaap:StatementBusinessSegments

udr:OperatingLeaseOtherIncome

udr:UnitedDominionRealityLP, udr:NonMatureCommunitiesOther


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.1761.710.2070.1370.1770.078-0.0240.1870.1350.1410.1150.188
Percentage of OperatingLeaseOtherIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

udr:UnitedDominionRealityLP, udr:SameCommunitiesMidAtlanticRegion


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.4130.4820.3760.4310.460.5510.4290.5350.4060.4410.4230.495
Percentage of OperatingLeaseOtherIncome234.728.2181.6314.6259.9706.4-1787.5286.1300.7312.8367.8263.3

udr:UnitedDominionRealityLP, udr:SameCommunitiesNortheastRegion


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.1120.1680.0940.1010.1250.1870.1680.1660.1260.1780.1520.166
Percentage of OperatingLeaseOtherIncome63.69.845.473.770.6239.7-700.088.893.3126.2132.288.3

udr:UnitedDominionRealityLP, udr:SameCommunitiesSoutheasternRegion


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.6860.6630.5490.6440.6240.7990.7270.7760.6650.6580.6910.75
Percentage of OperatingLeaseOtherIncome389.838.8265.2470.1352.51024.4-3029.2415.0492.6466.7600.9398.9

udr:UnitedDominionRealityLP, udr:SameCommunitiesSouthwesternRegion


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value0.0460.0650.0350.0710.0920.0870.0910.0310.0580.09
Percentage of OperatingLeaseOtherIncome26.13.816.951.852.0111.5-379.216.641.178.3

udr:UnitedDominionRealityLP, udr:SameCommunitiesWesternRegion


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2.0131.9961.6031.7791.9652.0631.8521.9941.6771.751.9111.824
Percentage of OperatingLeaseOtherIncome1143.8116.7774.41298.51110.22644.9-7716.71066.31242.21241.11661.7970.2

udr:UnitedDominionRealityLP, udr:TotalCommunities


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3.4465.0842.8643.1633.3513.7653.2433.6583.0093.2263.3823.423
Percentage of OperatingLeaseOtherIncome1958.0297.31383.62308.81893.24826.9-13512.51956.12228.92287.92940.91820.7

udr:OperatingLeaseOtherIncome us-gaap:StatementBusinessSegments

udr:NonMatureCommunitiesOther


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.6910.5461.8453.151.6281.6044.1073.1732.7260.7112.9552.7953.2310.665
Percentage of OperatingLeaseOtherIncome0.00.01048.3184.2786.51170.82320.34067.9-11358.3380.22188.91982.32809.6353.7

udr:SameCommunitiesMidAtlanticRegion


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.9721.7021.6041.8311.4291.5734.0914.3764.2412.0033.7734.0323.9511.736
Percentage of OperatingLeaseOtherIncome0.00.0911.4107.1690.31148.22311.35610.3-17670.81071.12794.82859.63435.7923.4

udr:SameCommunitiesNortheastRegion


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.0481.0470.6461.1020.7610.5011.1051.3211.3080.631.1681.2261.1540.581
Percentage of OperatingLeaseOtherIncome0.00.0367.064.4367.6365.7624.31693.6-5450.0336.9865.2869.51003.5309.0

udr:SameCommunitiesSoutheasternRegion


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.8891.4931.4461.4361.2261.4293.1343.4383.4731.7883.1273.2113.3421.697
Percentage of OperatingLeaseOtherIncome0.00.0821.684.0592.31043.11770.64407.7-14470.8956.12316.32277.32906.1902.7

udr:SameCommunitiesSouthwesternRegion


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.0530.8750.7280.710.5150.591.2121.5271.520.7331.2951.5251.5080.569
Percentage of OperatingLeaseOtherIncome0.00.0413.641.5248.8430.7684.71957.7-6333.3392.0959.31081.61311.3302.7

udr:SameCommunitiesWesternRegion


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2.6532.7183.0153.4182.8422.7747.5577.8697.8993.1546.9267.1687.3762.738
Percentage of OperatingLeaseOtherIncome0.00.01713.1199.91372.92024.84269.510088.5-32912.51686.65130.45083.76413.91456.4

udr:TotalCommunities


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value9.3068.3819.284118.4018.4712121219.0191919207.986
Percentage of OperatingLeaseOtherIncome0.00.05275.0681.14058.56183.211980.827825.6-88195.84823.014254.814153.917880.04247.9

udr:OperatingLeaseRightOfUseAssetAmortization

udr:OperatingLeaseRightOfUseAssetAmortization


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value900000.0800000.0800000.0900000.0800000.0800000.0600000.0200000.0200000.0200000.0
Percentage of OperatingLeaseRightOfUseAssetAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

udr:OperatingLeaseRightOfUseAssetAmortization dei:LegalEntity

udr:UnitedDominionRealityLP


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value1000000.0800000.0800000.0900000.0400000.0200000.0
Percentage of OperatingLeaseRightOfUseAssetAmortization125.088.9100.0112.566.7100.0

udr:OperatingPartnershipUnitRedemptionsForCommonSharesOfParentCompany dei:LegalEntity, us-gaap:PartnerTypeOfPartnersCapitalAccount

udr:OperatingPartnershipUnitRedemptionsForCommonSharesOfParentCompany

udr:UnitedDominionRealityLP, udr:LimitedPartners


Operating
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0.00.00.110.3880.06.949710.00.00.0960.320.00.156
Percentage of OperatingPartnershipUnitRedemptionsForCommonSharesOfParentCompany0.00.0100.0100.00.0100.0100.00.00.0100.0100.00.0100.0

udr:UnitedDominionRealityLP, us-gaap:LimitedPartner


Operating
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0.00.0-0.11-0.3880.0-6.949-71.6730.00.0-0.096-0.320.0-0.156
Percentage of OperatingPartnershipUnitRedemptionsForCommonSharesOfParentCompany0.00.0-100.0-100.00.0-100.0-100.00.00.0-100.0-100.00.0-100.0

udr:OtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

udr:OtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterest


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value313000.0530000.01350000.01446000.0930000.0-2422000.0-1426000.0-1184000.0-4868000.0-2903000.0-269000.01609000.0-131000.01405000.01486000.0228000.0-107000.01321000.05537000.01828000.0-939000.0643000.01509000.0-4997000.06255000.0-6590000.0-7989000.01439000.01399000.01421000.01483000.01203000.01688000.01758000.01816000.0531000.0335000.0-37000.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

udr:OtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value313000.0530000.01350000.01446000.0930000.0-2422000.0-1426000.0-1184000.0-4868000.0-2903000.0-269000.01609000.0-131000.01405000.01486000.0228000.0-107000.01321000.05537000.01828000.0-939000.0643000.01509000.0-4997000.06255000.0-6590000.0-7989000.01439000.01399000.01421000.01483000.01203000.01688000.01758000.01816000.0531000.0335000.0-37000.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

udr:OtherCostAndExpenseOperatingIncludingDiscontinuedOperations

udr:OtherCostAndExpenseOperatingIncludingDiscontinuedOperations


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value4.3734.4356.1535.5436.14.9662.82.7512.7355.6463.9523.3142.8252.0093.051.952.3691.6912.3691.6361.8921.7523.5342.6391.7691.7662.1532.0122.1711.9351.8991.7871.8071.6431.4641.4671.4341.3831.5891.5391.5851.459
Percentage of OtherCostAndExpenseOperatingIncludingDiscontinuedOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

udr:OtherCostAndExpenseOperatingIncludingDiscontinuedOperations dei:LegalEntity

udr:UnitedDominionRealityLP


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value4.3324.113.8373.8592.3652.3012.4222.42.7662.3472.1971.5541.5851.5722.1281.5481.5311.5091.5191.51.4551.4821.4961.490.8011.4841.4511.4361.5131.4061.4231.3861.3281.3214.0954.0491.2811.3981.447
Percentage of OtherCostAndExpenseOperatingIncludingDiscontinuedOperations70.474.162.977.784.583.688.642.570.070.877.877.452.080.689.891.564.692.280.385.641.256.284.684.437.273.866.874.279.778.778.784.490.790.0285.6292.880.690.891.3

udr:OtherGeneralAndAdministrativeExpenseIncludingDiscontinuedOperations

udr:OtherGeneralAndAdministrativeExpenseIncludingDiscontinuedOperations


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value15121111101414121212101112111112111313111013171513121111121111119.8669.4761010139.37910111210
Percentage of OtherGeneralAndAdministrativeExpenseIncludingDiscontinuedOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

udr:OtherGeneralAndAdministrativeExpenseIncludingDiscontinuedOperations dei:LegalEntity

udr:UnitedDominionRealityLP


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value4.4054.3233.9515.3085.1364.0664.1514.6613.8924.1434.5454.3094.1154.1344.4085.2194.9124.6313.8445.4216.417.9357.0325.6397.1736.9397.4596.976.4846.8555.8945.5756.6234.6354.5054.92105.3946.294
Percentage of OtherGeneralAndAdministrativeExpenseIncludingDiscontinuedOperations36.836.236.035.435.333.333.637.435.534.836.736.635.533.238.639.937.139.235.539.235.650.151.246.461.260.159.558.156.260.359.758.864.046.232.852.594.745.548.9

udr:PaymentsForDepositsOnPendingAcquisitions

udr:PaymentsForDepositsOnPendingAcquisitions


Payments
Period End2021-06-302021-03-312020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value7721000.0-12821000.0-2030000.0-11250000.04340000.05100000.0-10350000.0000-1000000.0
Percentage of PaymentsForDepositsOnPendingAcquisitions100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0

udr:PercentageOfRevenueTotalLeaseRevenue dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType

udr:PercentageOfRevenueTotalLeaseRevenue

udr:UnitedDominionRealityLP, udr:ApartmentHomes


Percentage
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value-0.397.0070.0090.9840-0.003
Percentage of PercentageOfRevenueTotalLeaseRevenue100.0100.0100.0100.00.0100.0

udr:UnitedDominionRealityLP, us-gaap:AssetsLeasedToOthers


Percentage
Period End2020-12-312020-09-302019-06-30
Value0.31.9930.013
Percentage of PercentageOfRevenueTotalLeaseRevenue-100.02.10.0

udr:PercentageOfRevenueTotalLeaseRevenue us-gaap:PropertyPlantAndEquipmentByType

udr:ApartmentHomes


Percentage
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value098.6-0.296.5140.0020.9840-0.001
Percentage of PercentageOfRevenueTotalLeaseRevenue0.00.066.799.522.2100.00.033.3

us-gaap:AssetsLeasedToOthers


Percentage
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value1.40.22.486-0.0020.01600.001
Percentage of PercentageOfRevenueTotalLeaseRevenue0.0-66.72.6-22.21.60.0-33.3

udr:PropertyManagementCostsOperating

udr:PropertyManagementCostsOperating


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value9.2738.9958.6598.8798.7979.2038.7038.3098.0067.7037.287.247.0576.8886.8786.827
Percentage of PropertyManagementCostsOperating100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

udr:PropertyManagementCostsOperating dei:LegalEntity

udr:UnitedDominionRealityLP


Property
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value2.9813.0953.0243.2253.2033.2113.3082.9792.9853.0122.952.9312.9552.894
Percentage of PropertyManagementCostsOperating34.434.934.435.036.838.641.338.741.041.641.842.643.042.4

udr:RecognitionOfOperatingLeaseRightOfUseAssets dei:LegalEntity

udr:RecognitionOfOperatingLeaseRightOfUseAssets

udr:UnitedDominionRealityLP


Recognition
Period End2020-12-312020-09-30
Value0.1530.072
Percentage of RecognitionOfOperatingLeaseRightOfUseAssets100.0100.0

udr:RelatedPartyTransactionManagementFeePercentage us-gaap:RelatedPartyTransactionsByRelatedParty

udr:RelatedPartyTransactionManagementFeePercentage

udr:TaxableReitSubsidiaries


Related
Period End2021-06-302021-03-31
Value03.0
Percentage of RelatedPartyTransactionManagementFeePercentage0.0100.0

udr:RelatedPartyTransactionManagementFees dei:LegalEntity

udr:RelatedPartyTransactionManagementFees

udr:UnitedDominionRealityLP


Related
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-30
Value4.13.94.04.24.64.0
Percentage of RelatedPartyTransactionManagementFees100.0100.0100.0100.0100.0100.0

udr:RentalRevenuesPercentOfParentRentalRevenue us-gaap:Ownership

udr:RentalRevenuesPercentOfParentRentalRevenue

udr:UnitedDominionRealityLP


Rental
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302017-06-30
Value35.00.340.3539.00.40.400.420.43
Percentage of RentalRevenuesPercentOfParentRentalRevenue100.0100.0100.0100.0100.0100.00.0100.0100.0

udr:ReturnOnInvestmentInEquityMethodInvestments

udr:ReturnOnInvestmentInEquityMethodInvestments


Return
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value151.09418-0.1840.2751.7411.0751.0261.1011.9771.4
Percentage of ReturnOnInvestmentInEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

udr:SecuredDebtRefinancedAmount us-gaap:DebtInstrument, us-gaap:LongtermDebtType

udr:SecuredDebtRefinancedAmount

udr:FixedRateDebt, udr:MortgageNotePayableMaturesOnNovember2020


Secured
Period End2020-07-31
Value79
Percentage of SecuredDebtRefinancedAmount100.0

udr:SegmentReportingInformationNetOperatingIncome dei:LegalEntity, us-gaap:StatementBusinessSegments

udr:SegmentReportingInformationNetOperatingIncome

udr:UnitedDominionRealityLP, udr:NonMatureCommunitiesOther


Segment
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value4.4827.2811.8324.4165.7464.1814.6775.3552.6063.4713.4343.158138.677-8.9028.10915141413208.529.5697.8779.1575.4024.6468.116157.0719.2941041111912361317
Percentage of SegmentReportingInformationNetOperatingIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

udr:UnitedDominionRealityLP, udr:SameCommunitiesMidAtlanticRegion


Segment
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value9.0598.78110101010101010101010109.843-10.134106.746.6187.4797.2257.4561011111111111112111111-7.172181111-0.3671611
Percentage of SegmentReportingInformationNetOperatingIncome202.1120.6558.5244.5186.6253.8225.7196.5410.2293.2302.3329.175.2113.4113.8124.544.844.151.953.136.2124.9124.3145.6128.3211.4256.1142.577.6162.4125.6112.7-17.3161.359.086.4-1.0124.664.0

udr:UnitedDominionRealityLP, udr:SameCommunitiesNortheastRegion


Segment
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value3.3163.0555.0615.9095.9025.7366.266.205109.4719.78510109.884-10.4731010101010324.3834.361117.48211116.8247.0666.756.8586.475-12.3466.5816.1936.047
Percentage of SegmentReportingInformationNetOperatingIncome74.042.0276.3133.8102.7137.2133.8115.9386.9272.9284.9320.473.9113.9117.6124.966.867.972.274.0160.151.445.6146.981.7214.9245.784.145.495.573.863.3-29.758.532.046.7

udr:UnitedDominionRealityLP, udr:SameCommunitiesSoutheasternRegion


Segment
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value9.6519.3559.0219.559.3569.3719.3569.2578.9699.3368.8518.7928.5118.844-8.5448.2838.3257.9868.1658.0437.7497.6027.9387.717.5297.3277.5037.4577.2076.9576.9367.0056.7246.6176.5926.5776.2596.0285.907
Percentage of SegmentReportingInformationNetOperatingIncome215.3128.5492.4216.3162.8224.1200.0172.9344.2269.0257.7278.462.6101.996.0102.155.353.356.759.137.689.283.097.982.2135.6161.591.946.398.474.668.516.258.834.150.817.144.734.2

udr:UnitedDominionRealityLP, udr:SameCommunitiesSouthwesternRegion


Segment
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value1.2081.2661.3341.3911.3951.4051.4841.3371.2531.426-22.49612124.2134.2434.1924.1684.2173.3484.044.1043.1793.1123.1852.9422.9862.7282.8752.871
Percentage of SegmentReportingInformationNetOperatingIncome27.017.472.831.524.333.631.725.036.141.5-109.3141.1126.253.546.377.689.752.021.557.144.231.17.528.315.223.17.421.316.6

udr:UnitedDominionRealityLP, udr:SameCommunitiesWesternRegion


Segment
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value4445474949494947474747453539-38.961383534343328393635373535342735333126303029242928
Percentage of SegmentReportingInformationNetOperatingIncome984.9618.22600.71120.8863.71184.61055.1892.61805.91374.01371.11451.2263.9453.1437.7474.1232.7232.9237.4247.3139.2459.2380.9447.8404.2662.7760.6421.9177.7504.8361.5309.964.6272.2159.8230.567.7219.3166.7

udr:UnitedDominionRealityLP, udr:TotalCommunities


Segment
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-30
Value7174758181808179798079787876777574
Percentage of SegmentReportingInformationNetOperatingIncome1603.31026.64100.71846.81415.91933.31746.41477.93047.12309.12316.12479.1575.6882.3-865.1925.7498.3

udr:SegmentReportingInformationNetOperatingIncome us-gaap:StatementBusinessSegments

udr:NonMatureCommunitiesOther


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1111514341504029242017149.8419.06826191820423831315325252135212419271719196723394250362331371810
Percentage of SegmentReportingInformationNetOperatingIncome0.00.01141.7595.02277.31154.4706.9705.3529.8375.1663.4406.1286.6287.1198.0219.7-202.6247.0284.3256.0220.8229.2259.0302.9267.4271.8383.8398.4528.6245.5173.8243.2211.7191.4162.5206.5205.4328.9137.5272.9136.30.00.00.00.0

udr:SameCommunitiesMidAtlanticRegion


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value43423837394040394039393841393639403625242928262630292827282829282928-1.38434272616272625132525
Percentage of SegmentReportingInformationNetOperatingIncome0.00.0852.7511.72134.4914.3706.4953.1856.2731.61504.41101.11198.41260.9269.9455.0-450.5447.8167.5164.9203.4206.3127.7316.8316.7371.8307.8511.3611.1353.3188.3405.4312.6281.2-3.3310.0140.1206.245.5201.7155.60.00.00.00.0

udr:SameCommunitiesNortheastRegion


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value34331318192020202120262526262626272623232322161616151115151010101010-21.3929.9879.7259.301
Percentage of SegmentReportingInformationNetOperatingIncome0.00.0301.9260.71071.5466.8362.3491.7459.2391.71031.3747.4774.8841.6193.7300.8-305.0331.7153.7155.6164.4168.680.4189.7170.0197.6126.0288.2332.7132.270.3150.5115.198.4-51.588.850.371.9

udr:SameCommunitiesSoutheasternRegion


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value26242223222222222222212121212020201919181918171717181817172019181818181717175.4912020165.1941919
Percentage of SegmentReportingInformationNetOperatingIncome0.00.0501.8325.71244.6512.2385.8529.4473.8411.0821.7622.2616.2666.5149.4238.7-225.3242.5130.2126.0132.5138.287.2206.1186.8235.5198.7323.6386.9247.2126.5263.1202.4182.843.7157.591.9136.015.0151.5116.70.00.00.00.0

udr:SameCommunitiesSouthwesternRegion


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1514101010119.59410108.9926.7727.647.6886.4526.7336.4296.6136.6784.1047.2128.1878.2279.2678.9678.9988.5368.5958.5098.2638.3586.3287.9836.9666.8833.7216.6026.2295.581-1.5177.4029.4024.809-1.5356.9788.585
Percentage of SegmentReportingInformationNetOperatingIncome0.00.0243.5144.2571.3250.4167.0249.9223.3167.9259.9220.1223.9204.349.674.1-74.382.427.348.156.860.545.0105.294.0108.493.9157.5177.9103.040.6112.975.067.39.058.732.243.1-4.154.954.40.00.00.00.0

udr:SameCommunitiesWesternRegion


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value777468777879818180787577767360626261565755544258515042494544384543412939383534353833283236
Percentage of SegmentReportingInformationNetOperatingIncome0.00.01528.91062.54286.71807.61417.51941.41728.31464.82910.92227.62237.32332.2447.3725.4-703.9763.3374.7385.9383.7404.1208.7681.6537.2637.7462.4909.1984.6546.8244.3644.2467.5403.970.5354.4197.3276.094.6264.5220.40.00.00.00.0

udr:TotalCommunities


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value208201204211212225215203199189187184183176177174174171170167
Percentage of SegmentReportingInformationNetOperatingIncome0.00.04570.52899.811585.95105.63745.84870.84270.63542.27191.65324.55337.15592.61307.82013.6-1961.62114.71136.41161.5

udr:SegmentReportingReconcilingItemsCostOfServicesDepreciationAndAmortization

udr:SegmentReportingReconcilingItemsCostOfServicesDepreciationAndAmortization


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1461441461511551551431271171121061071061081091071081051021051051051049090889189888885838388849498969184817573
Percentage of SegmentReportingReconcilingItemsCostOfServicesDepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

udr:SegmentReportingReconcilingItemsCostOfServicesDepreciationAndAmortization dei:LegalEntity

udr:UnitedDominionRealityLP


Segment
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312014-03-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value363535353535343434353637393739363636373644454545514651545150
Percentage of SegmentReportingReconcilingItemsCostOfServicesDepreciationAndAmortization25.323.322.822.724.627.629.630.832.532.534.134.735.934.636.235.135.434.935.034.950.253.254.454.757.855.354.855.553.855.1

udr:SegmentReportingReconcilingItemsOwnedPropertyManagementCosts

udr:SegmentReportingReconcilingItemsOwnedPropertyManagementCosts


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value9.2738.9958.6598.8798.7979.2038.7038.3098.0067.7037.287.247.0576.8886.8786.8276.7286.6356.603-6.607-6.4946.3796.445-5.988-5.8515.6945.6685.5995.5295.3465.2895.2365.1875.0685.0174.9985.2445.2075.3015.2384.8734.6894.624.4094.233
Percentage of SegmentReportingReconcilingItemsOwnedPropertyManagementCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

udr:SegmentReportingReconcilingItemsOwnedPropertyManagementCosts dei:LegalEntity

udr:UnitedDominionRealityLP


Segment
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value2.9813.0953.0243.2253.2033.2113.3082.9792.9853.0122.952.9312.9552.8942.8622.8222.8092.8212.7752.7172.8043.1673.1123.0272.9692.9552.8832.8152.8622.862.8242.7522.7442.7562.7892.732.7852.7452.644
Percentage of SegmentReportingReconcilingItemsOwnedPropertyManagementCosts34.434.934.435.036.838.641.338.741.041.641.842.643.042.442.542.542.5-42.7-42.742.643.5-52.9-53.253.252.452.852.152.754.154.654.454.354.755.153.252.452.552.454.3

udr:StockRepurchaseProgramWeightedAveragePricePerShare

udr:StockRepurchaseProgramWeightedAveragePricePerShare


Stock
Period End2020-12-312020-09-30
Value033.11
Percentage of StockRepurchaseProgramWeightedAveragePricePerShare0.0100.0

udr:WeightedAverageSharePrice us-gaap:SubsidiarySaleOfStock

udr:WeightedAverageSharePrice

udr:AtMarketOffering


Weighted
Period End2021-06-302019-12-312019-09-302019-07-312019-06-30
Value49.07046.1946.1945.64
Percentage of WeightedAverageSharePrice100.00.0100.0100.0100.0

udr:ForwardSalesAgreement


Weighted
Period End2021-03-312020-12-312019-12-312019-09-30
Value43.8548.2347.4147.68
Percentage of WeightedAverageSharePrice0.00.00.0103.2

us-gaap:AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease us-gaap:FinancingReceivablePortfolioSegment

us-gaap:AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease

udr:MultifamilyTenantLease


Allowance
Period End2021-06-302021-03-312020-12-312020-09-30
Value0.14.74.04.0
Percentage of AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease100.0100.0100.0100.0

udr:RetailTenantLease


Allowance
Period End2021-06-302021-03-312020-12-312020-09-30
Value0.70.81.70.8
Percentage of AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease700.017.042.520.0

us-gaap:AmortizationOfDebtDiscountPremium us-gaap:DebtInstrument, us-gaap:FinancialInstrument, us-gaap:LongtermDebtType

us-gaap:AmortizationOfDebtDiscountPremium

us-gaap:Mortgages, udr:FixedRateDebt, udr:DebtAssumedAsPartOfAcquisition


Amortization
Period End2021-06-302020-06-30
Value1.02.5
Percentage of AmortizationOfDebtDiscountPremium100.0100.0

us-gaap:AmortizationOfDebtDiscountPremium us-gaap:LongtermDebtType

udr:DebtAssumedAsPartOfAcquisition


Amortization
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value0.73.3142.52.61.30.60.60.60.60.90.70.70.80.70.70.70.80.60.70.81.61.31.31.11.31.31.21.31.31.31.21.31.31.31.21.1
Percentage of AmortizationOfDebtDiscountPremium0.00.00.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CapitalExpendituresIncurredButNotYetPaid


Capital
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value6.913313.6821.3050.832254.461-0.0771.50610-13.133-9.176-7.13339-5.065-0.314341.7211.62421216.453-9.6014.15119
Percentage of CapitalExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid dei:LegalEntity

udr:UnitedDominionRealityLP


Capital
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-0.1850.2580.1933.383-1.6070.5110.3333.676-1.4160.0361.5331.903-1.995-1.4510.6624.816-2.2730.3512.5154.505-3.0610.9792.2142.986
Percentage of CapitalExpendituresIncurredButNotYetPaid-5.019.823.213.2-36.0-663.622.134.210.8-0.4-21.54.839.4483.74.414.0-132.121.611.621.2-47.4-10.253.315.4

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.4710-0.0291.324-0.053-10.3629.75-0.482-0.131-184.737180-2.83210-0.977
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect dei:LegalEntity

udr:UnitedDominionRealityLP


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-0.4480.9630.4120.139-0.6550.5030.1050.3810.090.3950.1180.213
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect1544.872.7-777.4-1.3-6.7-104.4-80.2-0.20.0-13.91.2-21.8

us-gaap:ConversionOfStockAmountConverted1 us-gaap:StatementEquityComponents

us-gaap:ConversionOfStockAmountConverted1

us-gaap:AdditionalPaidInCapital


Conversion
Period End2020-12-312020-09-302020-06-302017-12-31
Value00-1435000.00
Percentage of ConversionOfStockAmountConverted10.00.0100.00.0

us-gaap:CommonStock


Conversion
Period End2020-12-312020-09-302020-06-30
Value00-1000.0
Percentage of ConversionOfStockAmountConverted10.00.00.1

us-gaap:PreferredStock


Conversion
Period End2020-12-312020-09-302020-06-302017-12-31
Value001436000.00
Percentage of ConversionOfStockAmountConverted10.00.0-100.10.0

us-gaap:ConversionOfStockAmountIssued1

us-gaap:ConversionOfStockAmountIssued1


Conversion
Period End2021-06-302021-03-312020-12-312016-12-312015-12-31
Value0.8424.4971.0433.552-0.001
Percentage of ConversionOfStockAmountIssued1100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentInterestRateDuringPeriod

us-gaap:DebtInstrumentInterestRateDuringPeriod


Debt
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-10-302019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value2.84-0.12.9776-0.00040.0328-0.0020.0463-0.0001-0.00090.03730.0009-0.000300.03660.03650.03670.03670.0013-0.001-0.00190.03950.03910.03580.03620.03940.03980.0390.03950.04310.04340.0420.04340.00060.00010.00220.0413-0.00130.0001
Percentage of DebtInstrumentInterestRateDuringPeriod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentInterestRateDuringPeriod dei:LegalEntity

udr:UnitedDominionRealityLP


Debt
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value0.022.4946-0.00290.0283-0.00070.0069-0.00340.025-0.01840.00050.00020.0480.00020.04260.00040.00040.00040.0382-0.00680.00010.00050.0438-0.0009-0.00010.00010.0447-0.00010-0.00030.04510.00010.0001
Percentage of DebtInstrumentInterestRateDuringPeriod-20.083.8725.086.335.0-6900.0377.867.0-2044.4-166.70.0131.10.0116.130.8-40.0-21.196.70.00.31.4121.0-2.3-0.30.3113.2-0.20.0-0.7103.916.7100.0

us-gaap:DebtInstrumentInterestRateDuringPeriod dei:LegalEntity, us-gaap:DebtInstrument

udr:UnitedDominionRealityLP, udr:FixedRateDebt


Debt
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312018-09-302018-06-302018-03-312017-12-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value03.06900.0310000.052800.05070-0.00030.00180.049-0.00320.000100.05210.00110.000100.05080.00010-0.00090.051600.0001
Percentage of DebtInstrumentInterestRateDuringPeriod-0.0103.1-0.094.5-0.0-0.00.0144.30.0138.10.030.0-94.7124.10.00.30.0143.92.80.30.0128.60.20.0-2.1118.90.0100.0

udr:UnitedDominionRealityLP, udr:VariableRateDebt


Debt
Period End2020-12-312020-09-302020-06-302020-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value0.070.7615-0.01060.01910.00830.00280.00120.0180.00110.0210.00080.00110.00080.0191000.00020.01720.0002-0.00040.00030.0171-0.0002-0.0001-0.00260.020400.0004
Percentage of DebtInstrumentInterestRateDuringPeriod-70.025.62650.058.2922.2-933.30.049.20.057.261.5-110.0-42.148.40.00.00.647.50.5-1.00.843.3-0.5-0.2-6.247.00.0400.0

us-gaap:DebtInstrumentInterestRateDuringPeriod dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

udr:UnitedDominionRealityLP, udr:FixedRateDebt, us-gaap:Mortgages


Debt
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value03.06900.03100.0343-0.02070.00010.00010.05480.00010.00010.00010.05440.00010.00010.00010.05410.00010.0001
Percentage of DebtInstrumentInterestRateDuringPeriod-0.0103.1-0.094.5-0.086.80.00.30.3151.40.30.30.3137.70.20.20.2124.716.7100.0

udr:UnitedDominionRealityLP, udr:VariableRateDebt, udr:TaxExemptNotesPayable


Debt
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312012-09-30
Value0.070.7615-0.01060.0191-0.0028-0.0006-0.00340.02470.00230.00280.00120.0180.00110.0139-0.00040.00190.0040.00780-0.00090.00080.00770.0036
Percentage of DebtInstrumentInterestRateDuringPeriod-70.025.62650.058.2140.0600.0377.866.2255.6-933.30.049.20.037.9-30.8-190.0-210.519.70.0-2.32.221.33600.0

us-gaap:DebtInstrumentInterestRateDuringPeriod us-gaap:DebtInstrument

udr:FixedRateDebt


Debt
Period End2021-03-312017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value3.370.04390.0453-0.0017-0.0017-0.00060.04930.05280.05280.05280.05260.05190.05180.05180.05180.05170.05170.0524000.0010.051-0.0003-0.0003
Percentage of DebtInstrumentInterestRateDuringPeriod118.7119.6123.4-130.8170.031.6124.8135.0147.5145.9133.5130.4132.8131.1120.2119.1123.1120.70.00.045.5123.523.1-300.0

udr:VariableRateDebt


Debt
Period End2021-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value0.770.01840.00090.00080.00080.0170.01450.01450.0144130.01440.01390.01450.01520.01540.01380.0140.0163-0.00010.0003-0.00060.01690.0011-0.0009
Percentage of DebtInstrumentInterestRateDuringPeriod27.150.169.2-80.0-42.143.037.140.539.836.534.937.238.535.731.833.337.6-16.7300.0-27.340.9-84.6-900.0

us-gaap:CommercialPaper


Debt
Period End2021-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-03-31
Value0.26-0.0029-0.0037-0.00130.02780.0047-0.00040.0020.02270.00560.01450.01490.01240
Percentage of DebtInstrumentInterestRateDuringPeriod9.2145.03700.0144.474.5522.2133.30.062.00.039.740.633.80.0

us-gaap:DebtInstrumentInterestRateDuringPeriod us-gaap:DebtInstrument, us-gaap:LongtermDebtType

udr:FixedRateDebt, udr:TermLoanFacilityDueSeptember2023


Debt
Period End2021-03-312020-12-31
Value1.070
Percentage of DebtInstrumentInterestRateDuringPeriod37.7-0.0

udr:FixedRateDebt, us-gaap:Mortgages


Debt
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value3.37-0.053.324-0.00010.03610.0006-0.002700.03820-0.002200.04040.04040.04040.0404-0.00260-0.00270.04570.05510.0550.05490.05460.05470.05460.05450.05440.05430.05420.054100.00010.00250.05060.0019-0.0004
Percentage of DebtInstrumentInterestRateDuringPeriod118.750.0111.625.0110.1-30.02700.0-0.0102.40.0733.30.0110.4110.7110.1110.1-200.0-0.0142.1115.7140.9153.6151.7138.6137.4140.0138.0126.2125.1129.0124.70.0100.0113.6122.5-146.2-400.0

udr:FixedRateDebt, us-gaap:SecuredDebt


Debt
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-30
Value-0.053.321500.03850.003-0.0029-0.00010.0385-0.004-0.001400.04390.0439
Percentage of DebtInstrumentInterestRateDuringPeriod50.0111.5-0.0117.4-150.02900.011.1103.2-444.4466.70.0119.9120.3

udr:VariableRateDebt, udr:TaxExemptNotesPayable


Debt
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value0.770.070.7615-0.01060.0191-0.0028-0.001-0.00140.02310.00170.0027-0.00010.0190.01590.01540.0142-0.00060.00270.0030.00880.00750.00840.00760.00830.00770.00860.00790.00840.00870.00890.0087-0.00010.001-0.00030.0088-0.00060
Percentage of DebtInstrumentInterestRateDuringPeriod27.1-70.025.62650.058.2140.01000.0155.661.9188.9-900.00.051.943.642.038.7-46.2-270.0-157.922.319.223.521.021.119.322.120.019.520.021.220.0-16.71000.0-13.621.346.20.0

udr:VariableRateDebt, us-gaap:SecuredDebt


Debt
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value0.7615-0.01060.0191-0.001-0.00140.0231-0.00120.00070.02210.01870.0179
Percentage of DebtInstrumentInterestRateDuringPeriod25.62650.058.21000.0155.661.9400.00.060.451.248.8

us-gaap:CommercialPaper, udr:UnsecuredRevolvingCreditFacilityDueTwoThousandTwenty


Debt
Period End2020-09-302020-06-302020-03-31
Value0.2955-0.01130.0158
Percentage of DebtInstrumentInterestRateDuringPeriod9.92825.048.2

us-gaap:DebtInstrumentInterestRateDuringPeriod us-gaap:LongtermDebtType

udr:A2.95MediumTermNoteDueSeptember2026


Debt
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value2.89-0.062.920500.02950
Percentage of DebtInstrumentInterestRateDuringPeriod101.860.098.1-0.089.9-0.0

udr:A3.50MediumTermNoteDueJuly2027


Debt
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value4.0303.46500.0350000.0350000.0350.0350.035
Percentage of DebtInstrumentInterestRateDuringPeriod141.9-0.0116.4-0.0106.7-0.0-0.0-0.093.80.0-0.00.095.695.995.4

udr:A3.50MediumTermNotesDueJanuary2028


Debt
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3.503.46500.0350000.0350000.035
Percentage of DebtInstrumentInterestRateDuringPeriod123.2-0.0116.4-0.0106.7-0.0-0.0-0.093.80.0-0.00.095.6

udr:A3.75MTNDueJuly2024


Debt
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value3.652500.03750000.03750000.03750.03750.03750.03750000.03750.03750.03750.03750.03750.03750.0375
Percentage of DebtInstrumentInterestRateDuringPeriod122.7-0.0114.3-0.0-0.0-0.0100.50.0-0.00.0102.5102.7102.2102.20.0-0.0-0.094.995.9104.7103.695.294.296.2

udr:A4.00MediumTermNoteDueOctober2025


Debt
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value04.4900.040
Percentage of DebtInstrumentInterestRateDuringPeriod-0.0150.8-0.0122.0-0.0

udr:EightPointFiveZeroPercentDebenturesDueSeptember2024


Debt
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value8.508.41500.0850000.0850000.0850.0850.0850.0850000.0850.0850.0850.0850.0850.0850.0850.0850.0850.0850.0850.085
Percentage of DebtInstrumentInterestRateDuringPeriod299.3-0.0282.6-0.0259.1-0.0-0.0-0.0227.90.0-0.00.0232.2232.9231.6231.60.0-0.0-0.0215.2217.4237.4234.8215.7213.6217.9215.2197.2195.9202.4195.9

udr:FourPointFourZeroPercentMediumTermNoteDueJanuaryTwoThousandTwentyNine


Debt
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value4.2704.22600.0440000.044
Percentage of DebtInstrumentInterestRateDuringPeriod150.4-0.0141.9-0.0134.1-0.0-0.0-0.0118.0

udr:MediumTerm1.90PercentageNoteDueMarch2033


Debt
Period End2021-03-31
Value1.9
Percentage of DebtInstrumentInterestRateDuringPeriod66.9

udr:MediumTerm3.00PercentageNoteDueAugust2031


Debt
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value3.0102.9800.030
Percentage of DebtInstrumentInterestRateDuringPeriod106.0-0.0100.1-0.091.5-0.0

udr:MediumTerm3.10PercentageNoteDueNovember2034


Debt
Period End2021-03-312020-12-312020-09-302020-06-302020-03-31
Value3.1303.09900.031
Percentage of DebtInstrumentInterestRateDuringPeriod110.2-0.0104.1-0.094.5

udr:SeniorUnsecuredMediumTerm2.10PercentNoteDue2033


Debt
Period End2021-03-31
Value2.1
Percentage of DebtInstrumentInterestRateDuringPeriod73.9

udr:SeniorUnsecuredMediumTermNotes3.2PercentDueJanuary2030


Debt
Period End2021-03-312020-12-312020-09-302020-06-302020-02-292020-03-312019-12-31
Value3.3203.28803.320.0320
Percentage of DebtInstrumentInterestRateDuringPeriod116.9-0.0110.4-0.097.60.0-0.0

udr:TermLoanFacilityDueSeptember2023


Debt
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1.02-0.011.0493-0.01410.0248-0.0042-0.0033-0.00050.03390.0021
Percentage of DebtInstrumentInterestRateDuringPeriod35.910.035.23525.075.6210.03300.055.690.9233.3

udr:TwoPointOneZeroPercentMediumTermNoteDueAugust12032


Debt
Period End2021-03-312020-12-31
Value2.10
Percentage of DebtInstrumentInterestRateDuringPeriod73.9-0.0

udr:UnsecuredWorkingCapitalCreditFacilityDueJanuary2021


Debt
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.9400.9601-0.00830.0182-0.0025-0.0038-0.0010.03320.00240.0010.00210.0278
Percentage of DebtInstrumentInterestRateDuringPeriod33.1-0.032.22075.055.5125.03800.0111.189.0266.7-333.30.076.0

us-gaap:SecuredDebt


Debt
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value3.293.2423-0.00030.038-0.0009-0.00020.036-0.00060.00010.04050.040.03990.038-0.0002-0.0014-0.0010.03920.04210.04220.04180.04160.04270.04280.04230.04240.04330.04340.0437
Percentage of DebtInstrumentInterestRateDuringPeriod115.8108.975.0115.9900.022.296.5200.00.0110.7109.6108.7103.5-15.4140.052.699.2107.7117.9115.5105.6107.3109.7107.198.499.8103.3100.7

us-gaap:UnsecuredDebt


Debt
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value2.72-0.13.0474-0.00030.0329-0.0027-0.0001-0.0010.03650.0021-0.000300.03470.03450.03490.03520.0021-0.0006-0.00210.03790.03720.0320.03260.03810.0380.03680.03770.04350.04350.0410.0431
Percentage of DebtInstrumentInterestRateDuringPeriod95.8100.0102.375.0100.3135.0100.0111.197.9233.3100.00.094.894.595.195.9161.560.0110.595.995.189.490.196.795.594.495.4100.9100.297.699.3

us-gaap:DebtInstrumentInterestRateDuringPeriod us-gaap:Range, us-gaap:LongtermDebtType

srt:WeightedAverage, udr:MediumTermNotesDueAugust2031


Debt
Period End2021-03-312020-12-312020-09-302020-06-302020-03-31
Value3.0102.979900.0301
Percentage of DebtInstrumentInterestRateDuringPeriod106.0-0.0100.1-0.091.8

srt:WeightedAverage, udr:ThreePointOneZeroPercentSeniorUnsecuredNotesDue2034


Debt
Period End2021-03-312020-12-312020-09-302020-06-302020-03-31
Value3.1303.098700.0313
Percentage of DebtInstrumentInterestRateDuringPeriod110.2-0.0104.1-0.095.4

us-gaap:DepreciationAndAmortization

us-gaap:DepreciationAndAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03