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JOINT VENTURES AND PARTNERSHIPS - Summary (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025 USD ($) home community property	Jun. 30, 2025 USD ($) home community property	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) home community property item	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
JOINT VENTURES AND PARTNERSHIPS
Number of communities | community	168	168		168
Investment in unconsolidated entities	$ 873,502	$ 873,502		$ 873,502		$ 912,184
Income/(loss) from investments		3,629	$ 4,046	9,443	$ 13,131
Sold joint ventures and other investments		$ 1,243	2,105	$ 2,656	4,145	52,105
Number of preferred equity agreements entered into | item				1
Number of preferred equity agreements redeemed | item				1
UDR/MetLife
JOINT VENTURES AND PARTNERSHIPS
Number of communities | property	13	13		13
Number of apartment homes | home	2,837	2,837		2,837
Investment in unconsolidated entities	$ 198,534	$ 198,534		$ 198,534		$ 206,308
UDR's ownership interest	50.20%	50.20%		50.20%		50.20%
Income/(loss) from investments		$ (1,135)	(1,408)	$ (2,176)	(3,254)
UDR/LaSalle
JOINT VENTURES AND PARTNERSHIPS
Number of communities | property	5	5		5
Number of apartment homes | home	1,590	1,590		1,590
Investment in unconsolidated entities	$ 262,912	$ 262,912		$ 262,912		$ 267,562
UDR's ownership interest	51.00%	51.00%		51.00%		51.00%
Income/(loss) from investments		$ (926)	(2,793)	$ (1,961)	(5,671)
Preferred Equity Investments
JOINT VENTURES AND PARTNERSHIPS
Proceeds from Sale of Real Estate	$ 54,800
Number of investments which receive a variable percentage of the value created from the project upon a capital or liquidating event | item				3
Unconsolidated Joint Ventures
JOINT VENTURES AND PARTNERSHIPS
Number of communities | property	18	18		18
Number of apartment homes | home	4,427	4,427		4,427
Investment in unconsolidated entities	$ 461,446	$ 461,446		$ 461,446		$ 473,870
Income/(loss) from investments		(2,061)	(4,201)	(4,137)	(8,925)
Real estate technology and sustainability investments
JOINT VENTURES AND PARTNERSHIPS
Investment in unconsolidated entities	67,081	67,081		67,081		57,344
Income/(loss) from investments		(158)	(189)	1,511	5,457
UDR Commitment	$ 86,000	$ 86,000		$ 86,000
Operating Community | Preferred Equity Investments
JOINT VENTURES AND PARTNERSHIPS
Number of communities | community	11	11		11
Number of apartment homes | home	6,158	6,158		6,158
Weighted Average Rate	9.70%	9.70%		9.70%
Investment in unconsolidated entities	$ 344,975	$ 344,975		$ 344,975		328,865
Income/(loss) from investments		4,605	6,331	9,413	12,454
UDR Commitment	315,498	315,498		315,498
Debt and Preferred Equity Program | Real estate technology and sustainability investments
JOINT VENTURES AND PARTNERSHIPS
Investment in unconsolidated entities	$ 412,056	412,056		412,056		$ 386,209
Income/(loss) from investments		$ 4,447	$ 6,142	$ 10,924	$ 17,911

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