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JOINT VENTURES AND PARTNERSHIPS - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Financial information relating to unconsolidated joint ventures operations |  |  |  |
Operating income/(loss) | $ 137,873 | $ (5,055) | $ 31,257 |
Joint Ventures and Partnerships |  |  |  |
Financial information relating to unconsolidated joint ventures operations |  |  |  |
Total revenues | 278,006 | 287,083 | 267,116 |
Property operating expenses | 105,349 | 112,347 | 103,969 |
Real estate depreciation and amortization | 105,883 | 115,211 | 106,805 |
Gain (loss) on sale of real estate | 115,516 |  | 71,590 |
Operating income/(loss) | 182,290 | 59,525 | 127,932 |
Interest expense | (80,198) | (87,363) | (78,829) |
Gain loss on revaluation of assets and liabilities | 483,906 |  |  |
Other income/(loss) | 159 | 148 | (439) |
Net income /(loss) | 586,157 | (27,690) | 48,664 |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |
Total real estate, net | 1,545,106 | 3,167,984 |  |
Cash and cash equivalents | 20,190 | 39,405 |  |
Other assets | 17,535 | 29,819 |  |
Total assets | 1,582,831 | 3,237,208 |  |
Third party debt, net | 1,041,663 | 2,114,420 |  |
Accounts payable and accrued liabilities | 26,537 | 59,717 |  |
Total liabilities | 1,068,200 | 2,174,137 |  |
Total equity | 514,631 | 1,063,071 |  |
Unconsolidated Joint Venture Other MetLife |  |  |  |
Financial information relating to unconsolidated joint ventures operations |  |  |  |
Total revenues | 64,273 | 61,967 | 48,032 |
Property operating expenses | 22,019 | 21,998 | 21,908 |
Real estate depreciation and amortization | 35,001 | 35,437 | 32,625 |
Operating income/(loss) | 7,253 | 4,532 | (6,501) |
Interest expense | (17,399) | (17,408) | (13,894) |
Net income /(loss) | (10,146) | (12,876) | (20,395) |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |
Total real estate, net | 621,335 | 653,729 |  |
Cash and cash equivalents | 7,973 | 8,242 |  |
Other assets | 5,400 | 4,904 |  |
Total assets | 634,708 | 666,875 |  |
Third party debt, net | 454,972 | 454,647 |  |
Accounts payable and accrued liabilities | 9,757 | 9,753 |  |
Total liabilities | 464,729 | 464,400 |  |
Total equity | 169,979 | 202,475 |  |
Unconsolidated Joint Venture Vitruvian Park |  |  |  |
Financial information relating to unconsolidated joint ventures operations |  |  |  |
Total revenues | 26,398 | 26,096 | 23,025 |
Property operating expenses | 12,541 | 13,732 | 11,839 |
Real estate depreciation and amortization | 9,832 | 9,495 | 7,169 |
Operating income/(loss) | 4,025 | 2,869 | 4,017 |
Interest expense | (5,948) | (6,051) | (5,030) |
Gain loss on revaluation of assets and liabilities | 25,711 |  |  |
Net income /(loss) | 23,788 | (3,182) | (1,013) |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |
Total real estate, net |  | 315,541 |  |
Cash and cash equivalents |  | 8,865 |  |
Other assets |  | 2,241 |  |
Total assets |  | 326,647 |  |
Third party debt, net |  | 162,131 |  |
Accounts payable and accrued liabilities |  | 14,968 |  |
Total liabilities |  | 177,099 |  |
Total equity |  | 149,548 |  |
Unconsolidated Joint Venture UDR Met Life I Partnership |  |  |  |
Financial information relating to unconsolidated joint ventures operations |  |  |  |
Total revenues | 9,834 | 3,187 |  |
Property operating expenses | 4,533 | 3,066 | 93 |
Real estate depreciation and amortization | 5,787 | 3,392 |  |
Gain (loss) on sale of real estate |  |  | (17) |
Operating income/(loss) | (486) | (3,271) | (110) |
Interest expense | (3,070) | (1,872) |  |
Net income /(loss) | (3,556) | (5,143) | (110) |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |
Total real estate, net | 120,055 | 124,112 |  |
Cash and cash equivalents | 2,317 | 698 |  |
Other assets | 1,053 | 1,074 |  |
Total assets | 123,425 | 125,884 |  |
Third party debt, net | 70,890 | 70,833 |  |
Accounts payable and accrued liabilities | 4,037 | 1,935 |  |
Total liabilities | 74,927 | 72,768 |  |
Total equity | 48,498 | 53,116 |  |
Unconsolidated Joint Venture UDR MetLife II Partnership |  |  |  |
Financial information relating to unconsolidated joint ventures operations |  |  |  |
Total revenues | 151,226 | 158,738 | 156,920 |
Property operating expenses | 54,445 | 56,403 | 52,450 |
Real estate depreciation and amortization | 44,077 | 44,721 | 45,144 |
Gain (loss) on sale of real estate |  |  | (609) |
Operating income/(loss) | 52,704 | 57,614 | 58,717 |
Interest expense | (44,825) | (49,118) | (50,603) |
Gain loss on revaluation of assets and liabilities | 458,195 |  |  |
Net income /(loss) | 466,074 | 8,496 | 8,114 |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |
Total real estate, net | 663,492 | 1,609,903 |  |
Cash and cash equivalents | 4,208 | 11,192 |  |
Other assets | 9,777 | 18,670 |  |
Total assets | 677,477 | 1,639,765 |  |
Third party debt, net | 425,303 | 1,089,231 |  |
Accounts payable and accrued liabilities | 9,303 | 21,258 |  |
Total liabilities | 434,606 | 1,110,489 |  |
Total equity | 242,871 | 529,276 |  |
Unconsolidated Joint Venture Three Washington DC |  |  |  |
Financial information relating to unconsolidated joint ventures operations |  |  |  |
Total revenues | 12,217 | 20,703 | 20,327 |
Property operating expenses | 4,982 | 8,318 | 8,159 |
Real estate depreciation and amortization | 5,746 | 14,487 | 14,480 |
Gain (loss) on sale of real estate | 115,516 |  |  |
Operating income/(loss) | 117,005 | (2,102) | (2,312) |
Interest expense | (4,300) | (6,739) | (5,264) |
Net income /(loss) | 112,705 | (8,841) | (7,576) |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |
Total real estate, net |  | 182,970 |  |
Cash and cash equivalents |  | 1,794 |  |
Other assets |  | 1,320 |  |
Total assets |  | 186,084 |  |
Third party debt, net |  | 165,699 |  |
Accounts payable and accrued liabilities |  | 1,860 |  |
Total liabilities |  | 167,559 |  |
Total equity |  | 18,525 |  |
Preferred Equity Investment West Coast Development JV |  |  |  |
Financial information relating to unconsolidated joint ventures operations |  |  |  |
Total revenues | 14,058 | 16,392 | 18,812 |
Property operating expenses | 6,829 | 8,830 | 9,520 |
Real estate depreciation and amortization | 5,440 | 7,679 | 7,387 |
Gain (loss) on sale of real estate |  |  | 72,216 |
Operating income/(loss) | 1,789 | (117) | 74,121 |
Interest expense | (4,656) | (6,175) | (4,038) |
Other income/(loss) | 159 | 148 | (439) |
Net income /(loss) | (2,708) | (6,144) | 69,644 |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |
Total real estate, net | 140,224 | 281,729 |  |
Cash and cash equivalents | 5,692 | 8,614 |  |
Other assets | 1,305 | 1,610 |  |
Total assets | 147,221 | 291,953 |  |
Third party debt, net | 90,498 | 171,879 |  |
Accounts payable and accrued liabilities | 3,440 | 9,943 |  |
Total liabilities | 93,938 | 181,822 |  |
Total equity | 53,283 | 110,131 |  |
Developer Capital Program excluding West Coast Development Joint Ventures |  |  |  |
Financial information relating to unconsolidated joint ventures operations |  |  |  |
Total revenues |  | 11,200 | 6,000 | $ 7,800
Expenses |  | 3,500 | 1,800 | $ 9,500
Other income/ loss | $ 26,400 |  |  |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |
Total assets |  | 521,000 | 248,100 |
Total liabilities |  | 135,000 | 22,500 |
Total equity |  | $ 386,000 | $ 225,600 |

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