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SEGMENT REPORTING - Revenues and Net Operating Income for Reportable Segments (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) segment | Sep. 30, 2020 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments | segment |  |  | 1 |
Segment revenues and net operating income [Abstract] |  |  |  |
Revenue | $ 50,413 | $ 44,138 | $ 143,717 | $ 132,454
Property operating expenses, including real estate taxes | 20,350 | 18,531 | 58,351 | 55,234
Net operating income | 30,063 | 25,607 | 85,366 | 77,220
Property management | (2,203) | (1,442) | (6,055) | (4,341)
Casualty gain (loss) | 10 | (91) | (64) | (1,331)
Depreciation and amortization | (22,447) | (18,995) | (61,747) | (55,311)
General and administrative expenses | (4,279) | (3,077) | (11,982) | (9,707)
Interest expense | (7,302) | (6,771) | (21,622) | (20,622)
Interest and other income (loss) | (5,082) | 277 | (4,032) | (1,979)
Income (loss) before gain (loss) on sale of real estate and other investments | (11,240) | (4,492) | (20,136) | (16,071)
Gain (loss) on sale of real estate and other investments | 0 | 25,676 | 26,840 | 25,486
Net income (loss) | (11,240) | 21,184 | 6,704 | 9,415
Multifamily |  |  |  |
Segment revenues and net operating income [Abstract] |  |  |  |
Revenue | 49,248 | 40,688 | 138,447 | 120,946
Property operating expenses, including real estate taxes | 20,066 | 16,900 | 55,907 | 49,626
Net operating income | 29,182 | 23,788 | 82,540 | 71,320
All Other |  |  |  |
Segment revenues and net operating income [Abstract] |  |  |  |
Revenue | 1,165 | 3,450 | 5,270 | 11,508
Property operating expenses, including real estate taxes | 284 | 1,631 | 2,444 | 5,608
Net operating income | $ 881 | $ 1,819 | $ 2,826 | $ 5,900

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