ACQUISITIONS AND DISPOSITIONS - Acquisitions (Details) - Acquisitions $ in Thousands	12 Months Ended
Dec. 31, 2020 USD ($) unit	Dec. 31, 2019 USD ($) unit
Acquisitions and development projects placed in service [Abstract]
Total acquisition costs	$ 191,013	$ 171,362
Form of consideration, cash	173,350	154,802
Form of consideration, other	17,663
Form of consideration, units		16,560
Investment allocation, land	12,639	13,316
Investment allocation, building	168,974	154,796
Investment allocation, intangible assets	2,995	2,825
Investment allocation, other	6,405
Ironwood Apartments - New Hope, MN
Acquisitions and development projects placed in service [Abstract]
Total acquisition costs	46,263
Form of consideration, cash	28,600
Form of consideration, other	17,663
Investment allocation, land	2,165
Investment allocation, building	36,869
Investment allocation, intangible assets	824
Investment allocation, other	6,405
Parkhouse Apartments - Thornton, CO
Acquisitions and development projects placed in service [Abstract]
Total acquisition costs	144,750
Form of consideration, cash	144,750
Form of consideration, other	0
Investment allocation, land	10,474
Investment allocation, building	132,105
Investment allocation, intangible assets	2,171
Investment allocation, other	$ 0
MultiFamily Same-Store
Acquisitions and development projects placed in service [Abstract]
Total acquisition costs		169,250
Form of consideration, cash		152,690
Form of consideration, units		16,560
Investment allocation, land		13,070
Investment allocation, building		152,930
Investment allocation, intangible assets		$ 2,825
MultiFamily Same-Store \| Ironwood Apartments - New Hope, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes \| unit	182
MultiFamily Same-Store \| Parkhouse Apartments - Thornton, CO
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes \| unit	465
MultiFamily Same-Store \| SouthFork Townhomes - Lakeville, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes \| unit		272
Total acquisition costs		$ 44,000
Form of consideration, cash		27,440
Form of consideration, units		16,560
Investment allocation, land		3,502
Investment allocation, building		39,950
Investment allocation, intangible assets		$ 548
MultiFamily Same-Store \| FreightYard Townhomes and Flats - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes \| unit		96
Total acquisition costs		$ 26,000
Form of consideration, cash		26,000
Form of consideration, units		0
Investment allocation, land		1,889
Investment allocation, building		23,615
Investment allocation, intangible assets		$ 496
MultiFamily Same-Store \| Lugano at Cherry Creek - Denver, CO
Acquisitions and development projects placed in service [Abstract]
Number of apartment homes \| unit		328
Total acquisition costs		$ 99,250
Form of consideration, cash		99,250
Form of consideration, units		0
Investment allocation, land		7,679
Investment allocation, building		89,365
Investment allocation, intangible assets		1,781
Acquisition credit		425
Other Property \| Minot, North Dakota
Acquisitions and development projects placed in service [Abstract]
Total acquisition costs		2,112
Form of consideration, cash		2,112
Form of consideration, units		0
Investment allocation, land		246
Investment allocation, building		1,866
Investment allocation, intangible assets		$ 0

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