JOINT VENTURES AND PARTNERSHIPS - Summary (Details)	3 Months Ended
	Mar. 31, 2024 USD ($) community home property item	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Unconsolidated entities
Number of communities | community	168
Assets	$ 11,190,488,000		$ 11,373,242,000
Liabilities	6,333,899,000		6,420,801,000
Total assets	11,190,488,000		11,373,242,000
Total liabilities	6,333,899,000		6,420,801,000
Investment in unconsolidated entities	945,364,000		944,071,000
Income/(loss) from investments	$ 9,085,000	$ 9,707,000
Sold joint ventures and other investments		1,487,000
UDR/MetLife
Unconsolidated entities
Number of communities | property	13
Number of apartment homes | home	2,837
Investment in unconsolidated entities	$ 219,387,000		$ 225,195,000
UDR's Ownership Interest	50.20%		50.20%
Income/(loss) from investments	$ (1,846,000)	(1,350,000)
UDR/LaSalle
Unconsolidated entities
Number of communities | property	5
Number of apartment homes | home	1,590
Investment in unconsolidated entities	$ 281,314,000		$ 286,723,000
UDR's Ownership Interest	51.00%		51.00%
Income/(loss) from investments	$ (2,878,000)
Preferred Equity Investments
Unconsolidated entities
Number of communities | community	23
Number of apartment homes	5,618
Weighted Average Rate	9.60%
Investment in unconsolidated entities	$ 394,135,000		$ 387,771,000
Income/(loss) from investments	$ 8,163,000	8,635,000
Years to Maturity	3 years 1 month 6 days
UDR Commitment	$ 321,096,000
Number of investments which receive a variable percentage of the value created from the project upon a capital or liquidating event | item	4
Unconsolidated Joint Ventures
Unconsolidated entities
Number of communities | property	18
Number of apartment homes | home	4,427
Investment in unconsolidated entities	$ 500,701,000		511,918,000
Income/(loss) from investments	$ (4,724,000)	(1,350,000)
Variable Interest Entity, Primary Beneficiary
Unconsolidated entities
Number of apartment homes | home	173
Operating Community | Preferred Equity Investments
Unconsolidated entities
Number of communities | community	21
Number of apartment homes	4,545
Weighted Average Rate	9.30%
Investment in unconsolidated entities	$ 308,820,000		304,699,000
Income/(loss) from investments	$ 5,920,000	6,643,000
Years to Maturity	3 years 1 month 6 days
UDR Commitment	$ 252,889,000
Development Community | Preferred Equity Investments
Unconsolidated entities
Number of communities | community	2
Number of apartment homes	1,073
Weighted Average Rate	10.70%
Investment in unconsolidated entities	$ 85,315,000		83,072,000
Income/(loss) from investments	$ 2,243,000	1,992,000
Years to Maturity	3 years 3 months 18 days
UDR Commitment	$ 68,207,000
Development Community | Real estate technology and sustainability investments
Unconsolidated entities
Investment in unconsolidated entities	50,528,000		44,382,000
Income/(loss) from investments	5,646,000	935,000
UDR Commitment	86,000,000
Development Community | Preferred Equity Investments and Real Estate Technology Investments
Unconsolidated entities
Investment in unconsolidated entities	444,663,000		$ 432,153,000
Income/(loss) from investments	$ 13,809,000	$ 9,570,000