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COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands	3 Months Ended
	Sep. 30, 2022 USD ($) community	Apr. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)
Real estate properties
Number of communities owned (in communities) | community	164
Costs Incurred to Date	$ 420,367
UDR's Remaining Commitment	203,611
Casualty-related charges related to Hurricane Ian	1,000
Real estate technology investments RETV I
Real estate properties
Costs Incurred to Date	25,639
UDR's Remaining Commitment	4,320
Real estate technology investments RETV II
Real estate properties
Costs Incurred to Date	9,607
UDR's Remaining Commitment	8,100
Real estate technology investments RET Strategic Fund
Real estate properties
Costs Incurred to Date	7,435
UDR's Remaining Commitment	17,500
Climate Technology Fund
Real estate properties
Costs Incurred to Date	5,262		$ 5,300
UDR's Remaining Commitment	4,656
Contractual commitment			$ 10,000
RET ESG Technology Fund
Real estate properties
Costs Incurred to Date	3,959	$ 4,000
UDR's Remaining Commitment	$ 6,000
Contractual commitment		$ 10,000
Wholly owned - under development
Real estate properties
Number of communities owned (in communities) | community	5
Costs Incurred to Date	$ 368,465
UDR's Remaining Commitment	$ 163,035

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