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Amount of real estate acquired, at the acquisition date.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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ACQUISITIONS AND DISPOSITIONS - Acquisitions (Details) - Acquisitions	8 Months Ended	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) ft² unit	Apr. 30, 2018 USD ($) unit
Acquisitions and development projects placed in service [Abstract]
Total acquisition costs	$ 0	$ 171,362,000	$ 373,050,000
Form of consideration, cash		154,802,000	373,050,000
Form of consideration, equity		16,560,000
Investment allocation, land		13,316,000	54,098,000
Investment allocation, building		154,796,000	314,971,000
Investment allocation, intangible assets		2,825,000	3,981,000
Acquisition credit related to retail space lease-up		425,000
Multi-Family Residential
Acquisitions and development projects placed in service [Abstract]
Total acquisition costs		169,250,000
Form of consideration, cash		152,690,000
Form of consideration, equity		16,560,000
Investment allocation, land		13,070,000
Investment allocation, building		152,930,000
Investment allocation, intangible assets		2,825,000
Multi-Family Residential \| 272 homes - SouthFork Townhomes - Lakeville, MN
Acquisitions and development projects placed in service [Abstract]
Total acquisition costs		44,000,000
Form of consideration, cash		27,440,000
Form of consideration, equity		16,560,000
Investment allocation, land		3,502,000
Investment allocation, building		39,950,000
Investment allocation, intangible assets		$ 548,000
Number of apartment units \| unit		272
Multi-Family Residential \| 96 homes - FreightYard Townhomes and Flats - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Total acquisition costs		$ 26,000,000
Form of consideration, cash		26,000,000
Form of consideration, equity		0
Investment allocation, land		1,889,000
Investment allocation, building		23,615,000
Investment allocation, intangible assets		$ 496,000
Number of apartment units \| unit		96
Multi-Family Residential \| 328 homes - Lugano at Cherry Creek - Denver, CO(3)
Acquisitions and development projects placed in service [Abstract]
Total acquisition costs		$ 99,250,000
Form of consideration, cash		99,250,000
Form of consideration, equity		0
Investment allocation, land		7,679,000
Investment allocation, building		89,365,000
Investment allocation, intangible assets		$ 1,781,000
Number of apartment units \| unit		328
Multi-Family Residential \| Oxbo - St Paul, MN
Acquisitions and development projects placed in service [Abstract]
Total acquisition costs			61,500,000
Form of consideration, cash			61,500,000
Investment allocation, land			5,809,000
Investment allocation, building			54,910,000
Investment allocation, intangible assets			$ 781,000
Number of apartment units \| unit			191
Area of real estate property (sq ft) \| ft²		11,477
Multi-Family Residential \| 500 homes - Park Place - Plymouth, MN
Acquisitions and development projects placed in service [Abstract]
Total acquisition costs			$ 92,250,000
Form of consideration, cash			92,250,000
Investment allocation, land			10,609,000
Investment allocation, building			80,711,000
Investment allocation, intangible assets			$ 930,000
Number of apartment units \| unit			500
Multi-Family Residential \| 274 homes - Dylan - Denver, CO
Acquisitions and development projects placed in service [Abstract]
Total acquisition costs			$ 90,600,000
Form of consideration, cash			90,600,000
Investment allocation, land			12,155,000
Investment allocation, building			77,249,000
Investment allocation, intangible assets			$ 1,196,000
Number of apartment units \| unit			274
Multi-Family Residential \| 390 homes - Westend - Denver, CO
Acquisitions and development projects placed in service [Abstract]
Total acquisition costs			$ 128,700,000
Form of consideration, cash			128,700,000
Investment allocation, land			25,525,000
Investment allocation, building			102,101,000
Investment allocation, intangible assets			$ 1,074,000
Number of apartment units \| unit			390
Other \| 3100 10th St SW - Minot, ND
Acquisitions and development projects placed in service [Abstract]
Total acquisition costs		$ 2,112,000
Form of consideration, cash		2,112,000
Form of consideration, equity		0
Investment allocation, land		246,000
Investment allocation, building		1,866,000
Investment allocation, intangible assets		$ 0