SEGMENT REPORTING - Segment Assets and Accumulated Depreciation (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Property owned	$ 2,534,124	$ 2,271,170
Less accumulated depreciation	(535,401)	(443,592)
Total property owned	1,998,723	1,827,578
Cash and cash equivalents	10,458	31,267	$ 392
Restricted cash	1,433	7,358	$ 6,918
Other assets	22,687	30,582
Mortgage loans receivable	0	43,276
TOTAL ASSETS	2,033,301	1,940,061
Multifamily
Segment Reporting Information [Line Items]
Property owned	2,507,448	2,244,250
Less accumulated depreciation	(527,199)	(436,004)
Total property owned	1,980,249	1,808,246
All Other
Segment Reporting Information [Line Items]
Property owned	26,676	26,920
Less accumulated depreciation	(8,202)	(7,588)
Total property owned	$ 18,474	$ 19,332