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JOINT VENTURES AND PARTNERSHIPS - Commitments (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2025 USD ($) home | Jun. 30, 2025 USD ($) home | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) home | Jun. 30, 2024 USD ($) | Jul. 31, 2025 USD ($) home | Apr. 30, 2025 USD ($) home | Dec. 31, 2024 USD ($)
Joint Ventures |  |  |  |  |  |  |  |
Investment in unconsolidated entities | $ 873,502 | $ 873,502 |  | $ 873,502 |  |  |  | $ 912,184
Deferred fees from the sale of properties | 7,200 | 7,200 |  | 7,200 |  |  |  | 7,600
Joint venture management and other fees |  | $ 2,398 | $ 1,992 | $ 4,510 | $ 3,957 |  |  |
Type of revenue |  | udr:ManagementAndOtherFeesMember | udr:ManagementAndOtherFeesMember | udr:ManagementAndOtherFeesMember | udr:ManagementAndOtherFeesMember |  |  |
13th and Market Properties LLC | Accounts payable and Accrued Liabilities |  |  |  |  |  |  |  |
Joint Ventures |  |  |  |  |  |  |  |
Investment in unconsolidated entities | (6,300) | $ (6,300) |  | $ (6,300) |  |  |  | (5,300)
Daly City, CA |  |  |  |  |  |  |  |
Joint Ventures |  |  |  |  |  |  |  |
Number of apartment homes | home |  |  |  |  |  |  | 256 |
Equity investment |  |  |  |  |  |  | $ 13,000 |
Preferred return (as a percent) |  |  |  |  |  |  | 12.00% |
Preferred Equity Investments |  |  |  |  |  |  |  |
Joint Ventures |  |  |  |  |  |  |  |
Proceeds from sale of real estate | 54,800 |  |  |  |  |  |  |
Orlando, Florida |  |  |  |  |  |  |  |
Joint Ventures |  |  |  |  |  |  |  |
Number of apartment homes | home |  |  |  |  |  | 350 |  |
Equity investment |  |  |  |  |  | $ 23,800 |  |
Preferred return (as a percent) |  |  |  |  |  | 11.25% |  |
Operating Community | Preferred Equity Investments |  |  |  |  |  |  |  |
Joint Ventures |  |  |  |  |  |  |  |
Investment in unconsolidated entities | $ 344,975 | $ 344,975 |  | $ 344,975 |  |  |  | $ 328,865
Number of apartment homes | home | 6,158 | 6,158 |  | 6,158 |  |  |  |
Preferred return (as a percent) | 9.70% | 9.70% |  | 9.70% |  |  |  |

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