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COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands	Jul. 29, 2021 USD ($) home	Jun. 30, 2021 USD ($) community
Real estate properties
Number of communities owned (in communities) | community		153
Costs Incurred to Date		$ 330,447
UDR's Remaining Commitment		289,499
Real estate technology investments RETV I
Real estate properties
Costs Incurred to Date		28,696
UDR's Remaining Commitment		5,220
Real estate technology investments RETV II
Real estate properties
Costs Incurred to Date		3,471
UDR's Remaining Commitment		$ 14,400
Wholly owned - under development
Real estate properties
Number of communities owned (in communities) | community		5
Costs Incurred to Date		$ 286,925
UDR's Remaining Commitment		$ 214,575
Preferred Equity Investments
Real estate properties
Number of communities owned (in communities) | community		3
Costs Incurred to Date		$ 11,355
UDR's Remaining Commitment		$ 55,304
544 apartment home operating community, Maryland
Real estate properties
Number of apartment homes | home	544
Contractual purchase price commitment	$ 124,500
Deposit on purchase	$ 5,000
320 apartment home operating community, Pennsylvania
Real estate properties
Number of apartment homes | home	320
Contractual purchase price commitment	$ 115,000
Deposit on purchase	$ 5,000

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The number of units in a real estate property owned as of the balance sheet date.

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Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(17))
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-Name Accounting Standards Codification
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Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

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