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JOINT VENTURES AND PARTNERSHIPS - Summary (Details) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025 USD ($) community home property	Jun. 30, 2025 USD ($)	Sep. 30, 2025 USD ($) community home property	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) community home property item	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
JOINT VENTURES AND PARTNERSHIPS
Number of communities | community	168		168		168
Investment in unconsolidated entities	$ 905,105		$ 905,105		$ 905,105		$ 912,183
Income/(loss) from investments			14,011	$ (1,880)	23,454	$ 11,251
Sold unconsolidated joint ventures and partnerships			$ 3,765	2,241	$ 5,792	7,626	81,123
Number of preferred equity agreements entered into | item					3
Number of preferred equity agreements redeemed | item					2
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	$ 195,387		$ 195,387		$ 195,387		$ 206,308
UDR's ownership interest	50.20%		50.20%		50.20%		50.20%
Income/(loss) from investments			$ 62	(2,050)	$ (2,114)	(5,304)
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	$ 258,381		$ 258,381		$ 258,381		$ 267,562
UDR's ownership interest	51.00%		51.00%		51.00%		51.00%
Income/(loss) from investments			$ (813)	(1,311)	$ (2,774)	(6,982)
Preferred Equity Investments
JOINT VENTURES AND PARTNERSHIPS
Proceeds from Sale of Real Estate	$ 32,200	$ 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
Impairment loss			$ 8,100		$ 8,100
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	$ 453,768		$ 453,768		$ 453,768		$ 473,870
Income/(loss) from investments			(751)	(3,361)	(4,888)	(12,286)
Real estate technology and sustainability investments
JOINT VENTURES AND PARTNERSHIPS
Investment in unconsolidated entities	71,900		71,900		71,900		57,344
Income/(loss) from investments			4,416	493	5,927	5,950
UDR Commitment	$ 86,000		$ 86,000		$ 86,000
Operating Community | Preferred Equity Investments
JOINT VENTURES AND PARTNERSHIPS
Number of communities | community	12		12		12
Number of apartment homes | home	6,766		6,766		6,766
Weighted Average Rate	9.70%		9.70%		9.70%
Investment in unconsolidated entities	$ 379,437		$ 379,437		$ 379,437		299,846
Income/(loss) from investments			6,581	(1,253)	16,623	9,961
UDR Commitment	354,989		354,989		354,989
Debt and Preferred Equity Program | Real estate technology and sustainability investments
JOINT VENTURES AND PARTNERSHIPS
Investment in unconsolidated entities	$ 451,337		451,337		451,337		$ 357,190
Income/(loss) from investments			$ 10,997	$ (760)	$ 22,550	$ 15,911

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