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JOINT VENTURES AND PARTNERSHIPS - Commitments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Dec. 31, 2025
Joint Ventures |  |  |
Investment in unconsolidated entities | $ 750,459 |  | $ 879,735
Deferred fees from the sale of properties | 8,200 |  | 8,400
Joint venture management and other fees | $ 2,528 | $ 2,112 |
Type of revenue | udr:ManagementAndOtherFeesMember | udr:ManagementAndOtherFeesMember |
Equity method investment amount sold |  |  | 136,234
Management Services |  |  |
Joint Ventures |  |  |
Joint venture management and other fees | $ 2,500 | $ 2,100 |
13th and Market Properties LLC | Accounts payable and Accrued Liabilities |  |  |
Joint Ventures |  |  |
Investment in unconsolidated entities | $ (7,200) |  | $ (6,800)

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