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BASIS OF PRESENTATION (Details) shares in Millions	6 Months Ended
	Jun. 30, 2025 item community home shares
Consolidation And Basis Of Presentation
Number of real estate properties | community	168
Number of apartment homes owned and consolidated | home	55,808
Number of markets operating within | item	21
Joint venture, number of completed or to be completed homes in communities | home	10,585
Preferred equity investment,, number of apartment homes | home	6,158
Operating partnership outstanding units	190.2
United Dominion Reality L.P.
Consolidation And Basis Of Presentation
Operating Partnership units outstanding related to limited partner	176.6
General partnership units outstanding	0.1
General Partners' ownership (as a percent)	92.80%
UDR Lighthouse DownREIT L.P.
Consolidation And Basis Of Presentation
General Partners' ownership (as a percent)	71.30%
Operating partnership outstanding units	23.1
UDR Lighthouse DownREIT L.P.
Consolidation And Basis Of Presentation
Operating partnership outstanding units	32.4
Non-affiliated Partners | United Dominion Reality L.P.
Consolidation And Basis Of Presentation
Operating Partnership units outstanding related to limited partner	13.6
Percentage of units outstanding in Partnership	7.20%
Non-affiliated Partners | UDR Lighthouse DownREIT L.P.
Consolidation And Basis Of Presentation
Operating partnership outstanding units	9.3
Percentage of units outstanding in Partnership	28.70%

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General Partners Capital Account Units Owned Percentage.

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Number Of Apartment Homes Owned And Consolidated By Company

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Number of Markets Operating Within

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
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-Name Accounting Standards Codification
-Section S99
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