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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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