SEGMENT REPORTING - Revenues and Net Operating Income for Reportable Segments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) segment	Jun. 30, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			1
Segment revenues and net operating income [Abstract]
Revenue	$ 63,116	$ 46,656	$ 123,430	$ 93,304
Property operating expenses, including real estate taxes	26,216	18,760	52,089	38,001
Net operating income	36,900	27,896	71,341	55,303
Property management	(2,721)	(2,085)	(4,974)	(3,852)
Casualty gain (loss)	(382)	27	(980)	(74)
Depreciation and amortization	(24,768)	(19,308)	(55,769)	(39,300)
General and administrative expenses	(5,221)	(3,797)	(9,721)	(7,703)
Gain (loss) on sale of real estate and other investments	27	26,840	27	26,840
Interest expense	(7,561)	(7,089)	(15,276)	(14,320)
Interest and other income (loss)	(17)	619	1,046	1,050
Net income (loss)	(3,743)	23,103	(14,306)	17,944
Multifamily
Segment revenues and net operating income [Abstract]
Revenue	62,201	44,957	121,599	89,198
Property operating expenses, including real estate taxes	25,986	17,967	51,529	35,841
Net operating income	36,215	26,990	70,070	53,357
All Other
Segment revenues and net operating income [Abstract]
Revenue	915	1,699	1,831	4,106
Property operating expenses, including real estate taxes	230	793	560	2,160
Net operating income	$ 685	$ 906	$ 1,271	$ 1,946