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UNCONSOLIDATED ENTITIES (UNITED DOMINION REALTY, L.P.) - Summary Financial Information (Details) - UDR Lighthouse DownREIT L.P. - United Dominion Realty L.P. - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Total real estate, net | $ 1,106,703 | $ 1,167,720 |
Cash and cash equivalents | 20 | 39 |
Note receivable from the General Partner | 222,853 | 221,022 |
Other assets | 4,829 | 5,561 |
Total assets | 1,334,405 | 1,394,342 |
Secured debt, net | 427,592 | 431,735 |
Other liabilities | 28,087 | 26,597 |
Liabilities | 455,679 | 458,332 |
Total capital | 878,726 | 936,010 |
Total revenues | 128,621 | 138,121 | $ 134,669
Property operating expenses | (51,747) | (56,998) | (55,487)
Real estate depreciation and amortization | (82,283) | (85,872) | (84,000)
Gain/(loss) on sale of real estate |  | 24,053 |
Operating income/(loss) | (5,409) | 19,304 | (4,818)
Interest expense | (15,648) | (14,456) | (14,483)
Other income/(loss) | 8,061 | 4,884 | 4,718
Net income /(loss) | $ (12,996) | $ 9,732 | $ (14,583)

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