SEGMENTS - Revenues and Net Operating Income for Reportable Segments (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) segment apartmentCommunity	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	1
Segment Reporting Information, Profit (Loss) [Abstract]
Revenue	$ 261,309,000	$ 256,716,000	$ 201,705,000
Property operating expenses, including real estate taxes	105,812,000	108,637,000	81,857,000
Net operating income	155,497,000	148,079,000	119,848,000
Property management expenses	(9,353,000)	(9,895,000)	(8,752,000)
Casualty loss	(2,095,000)	(1,591,000)	(344,000)
Depreciation and amortization	(101,678,000)	(105,257,000)	(92,165,000)
Impairment of real estate investments	(5,218,000)	0	0
General and administrative expenses	(20,080,000)	(17,516,000)	(16,213,000)
Gain on sale of real estate and other investments	71,244,000	41,000	27,518,000
Loss on litigation settlement	(3,864,000)	0	0
Interest expense	(36,429,000)	(32,750,000)	(29,078,000)
Interest and other income (loss)	1,207,000	1,248,000	(2,915,000)
NET INCOME (LOSS)	$ 49,231,000	(17,641,000)	(2,101,000)
Disposed of by Sale | 2023 Diposals
Segment Reporting Information [Line Items]
Number of properties sold, reclassified to other | apartmentCommunity	13
Multifamily
Segment Reporting Information, Profit (Loss) [Abstract]
Revenue	$ 246,364,000	224,375,000	173,436,000
Property operating expenses, including real estate taxes	98,762,000	92,327,000	68,618,000
Net operating income	147,602,000	132,048,000	104,818,000
All Other
Segment Reporting Information, Profit (Loss) [Abstract]
Revenue	14,945,000	32,341,000	28,269,000
Property operating expenses, including real estate taxes	7,050,000	16,310,000	13,239,000
Net operating income	$ 7,895,000	$ 16,031,000	$ 15,030,000