ORGANIZATION, BACKGROUND AND SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Thousands	3 Months Ended									6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2019 USD ($) property_Unit state property property_unit	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)		Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2019 USD ($) property_Unit state property property_unit	Dec. 31, 2018 USD ($)
Real Estate Properties
Number of properties | property	8													8
Number of states in which entity operates | state	6													6
Number of units | property_Unit	1,880													1,880
Real estate investment property, net	$ 169,689	$ 151,046	$ 152,106	$ 175,785	$ 176,942	[1]	$ 160,019	$ 120,539	$ 121,525	$ 152,106	$ 120,539	$ 151,046	$ 160,019	$ 169,689	$ 176,942	[1]
Real estate investments, other	14,399													14,399
Mortgage loans on real estate	4,150													4,150
Revenues	6,922	6,422	7,287	7,130	6,434		6,325	5,408	5,262	14,417	10,670	20,839	16,995	27,761	23,429	[1]
Equity method investment	(2,150)	(2,390)	(2,218)	(2,068)	(1,148)		(1,627)	(2,566)	253	(4,286)	(2,313)	(6,676)	(3,940)	(8,826)	(5,088)	[1]
Restatement Adjustment [Member]
Real Estate Properties
Real estate investment property, net		(961,850)	(946,826)	(901,541)	(852,297)		(860,855)	(933,945)	(871,725)	(946,826)	(933,945)	(961,850)	(860,855)		(852,297)
Revenues		(27,614)	(25,833)	(23,816)	(25,005)		(25,156)	(24,746)	(24,389)	(49,649)	(49,135)	(77,263)	(74,291)		(99,296)
Equity method investment		$ (2,131)	$ (2,057)	$ (1,845)	(1,023)		$ (1,453)	$ (2,439)	$ 316	$ (3,902)	$ (2,123)	$ (6,033)	$ (3,576)		(4,600)
Multi-family residential
Real Estate Properties
Real estate investment property, net	$ 159,400													$ 159,400
Multi-family residential | Building
Real Estate Properties
Real estate property, estimated useful life														30 years
Multi-family residential | Maximum
Real Estate Properties
Operating leases, term of contract	1 year													1 year
Unconsolidated joint ventures
Real Estate Properties
Number of properties | property	30													30
Number of states in which entity operates | state	9													9
Number of units | property_Unit	8,898													8,898
Number of units in real estate property, in lease up stage | property_Unit	741													741
Number of properties in real estate property, in lease up stage | property_unit	2													2
Real estate investment property, net	$ 1,070,941				$ 1,007,302									$ 1,070,941	1,007,302
Net equity investments	$ 177,000													177,000
Revenues														$ 118,177	$ 109,433

[1] * Amounts restated See footnotes 2 and 16 for more information.