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SEGMENTS - Revenues and Net Operating Income for Reportable Segments (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 USD ($) apartmentCommunity | Sep. 30, 2023 USD ($) apartmentCommunity | Sep. 30, 2024 USD ($) segment apartmentCommunity | Sep. 30, 2023 USD ($) apartmentCommunity | Dec. 31, 2023 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Number of reportable segments | segment |  |  | 1 |  |
Segment revenues and net operating income [Abstract] |  |  |  |  |
Revenue | $ 65,025,000 | $ 64,568,000 | $ 194,574,000 | $ 197,241,000 |
Property operating expenses, including real estate taxes | 26,659,000 | 26,745,000 | 76,917,000 | 80,714,000 |
Net operating income | 38,366,000 | 37,823,000 | 117,657,000 | 116,527,000 |
Property management expense | (2,242,000) | (2,197,000) | (6,794,000) | (7,012,000) |
Casualty gain (loss) | 412,000 | (937,000) | (918,000) | (1,242,000) |
Depreciation and amortization | (26,084,000) | (24,697,000) | (78,810,000) | (75,061,000) |
General and administrative expenses | (4,102,000) | (3,832,000) | (12,941,000) | (15,717,000) |
Gain on sale of real estate and other investments | 0 | 11,235,000 | (577,000) | 71,327,000 |
Loss on litigation settlement | 0 | 0 | 0 | (2,864,000) | $ (1,000,000.0)
Interest expense | (8,946,000) | (8,556,000) | (27,485,000) | (27,516,000) |
Interest and other income | 645,000 | 330,000 | 1,462,000 | 674,000 |
Net income (loss) | (1,951,000) | 9,169,000 | (8,406,000) | 59,116,000 |
All Other |  |  |  |  |
Segment revenues and net operating income [Abstract] |  |  |  |  |
Revenue | 568,000 | 3,779,000 | 2,312,000 | 16,482,000 |
Property operating expenses, including real estate taxes | 229,000 | 1,727,000 | 974,000 | 7,943,000 |
Net operating income | $ 339,000 | $ 2,052,000 | $ 1,338,000 | $ 8,539,000 |
Disposed of by Sale |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of properties sold | apartmentCommunity | 0 | 4 | 2 | 13 |
Multifamily | Operating Segments |  |  |  |  |
Segment revenues and net operating income [Abstract] |  |  |  |  |
Revenue | $ 64,457,000 | $ 60,789,000 | $ 192,262,000 | $ 180,759,000 |
Property operating expenses, including real estate taxes | 26,430,000 | 25,018,000 | 75,943,000 | 72,771,000 |
Net operating income | $ 38,027,000 | $ 35,771,000 | $ 116,319,000 | $ 107,988,000 |

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