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JOINT VENTURES AND PARTNERSHIPS - Commitments (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 28, 2021 USD ($) | Jan. 31, 2021 USD ($) home community | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Feb. 28, 2022 | Mar. 31, 2021 USD ($) home | Dec. 31, 2020 USD ($)
Joint Ventures |  |  |  |  |  |  |  |  |
Investment in unconsolidated entities |  |  | $ 613,903 |  | $ 613,903 |  |  |  | $ 595,486
Balance payments made | $ 12,500 |  |  |  |  |  |  |  |
Gain/(loss) on sale of real estate owned |  |  |  | $ 61,303 | 50,829 | $ 61,303 |  |  |
Deferred fees from the sale of properties |  |  | 9,100 |  | 9,100 |  |  |  | 8,400
Joint venture management and other fees |  |  | $ 2,232 | $ 1,274 | $ 3,847 | $ 2,662 |  |  |
Type of revenue |  |  | udr:ManagementAndOtherFeesMember | udr:ManagementAndOtherFeesMember | udr:ManagementAndOtherFeesMember | udr:ManagementAndOtherFeesMember |  |  |
Preferred Equity Investment Herndon, Virginia |  |  |  |  |  |  |  |  |
Joint Ventures |  |  |  |  |  |  |  |  |
Investment in unconsolidated entities |  | $ 30,200 |  |  |  |  |  |  |
Preferred return (as a percent) |  | 9.00% |  |  |  |  |  |  |
Joint venture, number of homes in communities | home |  | 356 |  |  |  |  |  |  |
Preferred Equity Investment Allen, Texas |  |  |  |  |  |  |  |  |
Joint Ventures |  |  |  |  |  |  |  |  |
Investment in unconsolidated entities |  |  |  |  |  |  |  | $ 19,800 |
Number of apartment homes | home |  |  |  |  |  |  |  | 469 |
Preferred return (as a percent) |  |  |  |  |  |  |  | 9.00% |
Preferred Equity Investment Los Angeles, California |  |  |  |  |  |  |  |  |
Joint Ventures |  |  |  |  |  |  |  |  |
Number of apartment homes | community |  | 293 |  |  |  |  |  |  |
Proceeds from sale of real estate |  | $ 121,000 |  |  |  |  |  |  |
Gain/(loss) on sale of real estate owned |  | $ 2,500 |  |  |  |  |  |  |
Preferred Equity Investment 1200 Broadway Nashville TN |  |  |  |  |  |  |  |  |
Joint Ventures |  |  |  |  |  |  |  |  |
Preferred return (as a percent) | 12.25% |  |  |  |  |  |  |  |
Preferred Equity Investment 1200 Broadway Nashville TN | Forecast |  |  |  |  |  |  |  |  |
Joint Ventures |  |  |  |  |  |  |  |  |
Preferred return (as a percent) |  |  |  |  |  |  | 8.00% |  |
Accounts Payable, Accrued Expenses and Other Liabilities | 13th and Market Properties LLC |  |  |  |  |  |  |  |  |
Joint Ventures |  |  |  |  |  |  |  |  |
Investment in unconsolidated entities |  |  | $ (5,300) |  | $ (5,300) |  |  |  | $ (4,700)

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