ACQUISITIONS AND DISPOSITIONS - Acquisitions (Details) $ in Thousands		12 Months Ended
	Sep. 01, 2021 USD ($)	Dec. 31, 2022 USD ($) apartmentHome	Dec. 31, 2021 USD ($) apartmentUnit
2022 Acquisitions
Acquisitions and development projects placed in service [Abstract]
Total acquisition cost		$ 211,874
Form of Consideration
Cash		104,093
Units		22,882
Other		84,899
Investment Allocation
Land		13,812
Building		192,229
Intangible Assets		7,050
Other		(1,217)
Capitalized transaction cost		$ 573
Martin Blu - Eden Prairie, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment communities acquired | apartmentHome		191
Total acquisition cost		$ 49,825
Form of Consideration
Cash		3,031
Units		18,885
Other		27,909
Investment Allocation
Land		3,547
Building		45,212
Intangible Assets		1,813
Other		$ (747)
Elements of Linden Hills - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment communities acquired | apartmentHome		31
Total acquisition cost		$ 9,066
Form of Consideration
Cash		1,290
Units		1,748
Other		6,028
Investment Allocation
Land		941
Building		7,853
Intangible Assets		335
Other		$ (63)
Zest - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment communities acquired | apartmentHome		45
Total acquisition cost		$ 11,364
Form of Consideration
Cash		1,429
Units		2,249
Other		7,686
Investment Allocation
Land		936
Building		10,261
Intangible Assets		574
Other		$ (407)
Noko Apartments - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment communities acquired | apartmentHome		130
Total acquisition cost		$ 46,619
Form of Consideration
Cash		3,343
Units		0
Other		43,276
Investment Allocation
Land		1,915
Building		42,754
Intangible Assets		1,950
Other		$ 0
Lyra Apartments - Centennial, CO
Acquisitions and development projects placed in service [Abstract]
Number of apartment communities acquired | apartmentHome		215
Total acquisition cost		$ 95,000
Form of Consideration
Cash		95,000
Units		0
Other		0
Investment Allocation
Land		6,473
Building		86,149
Intangible Assets		2,378
Other		$ 0
2021 Acquisitions
Acquisitions and development projects placed in service [Abstract]
Total acquisition cost			$ 499,816
Form of Consideration
Cash			155,599
Units			217,513
Other			126,704
Investment Allocation
Land			51,746
Building			431,189
Intangible Assets			19,234
Other			$ (2,353)
Capitalized transaction cost	$ 9,100
2021 Acquisitions | Series E Preferred Stock
Acquisitions and development projects placed in service [Abstract]
Total acquisition cost	$ 36,100
Union Pointe Apartment Homes - Longmont, CO
Acquisitions and development projects placed in service [Abstract]
Number of apartment communities acquired | apartmentUnit			256
Total acquisition cost			$ 76,900
Form of Consideration
Cash			76,900
Units			0
Other			0
Investment Allocation
Land			5,727
Building			69,966
Intangible Assets			1,207
Other			$ 0
Bayberry Place - Eagan, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment communities acquired | apartmentUnit			120
Total acquisition cost			$ 16,673
Form of Consideration
Cash			898
Units			9,855
Other			5,920
Investment Allocation
Land			1,807
Building			14,113
Intangible Assets			753
Other			$ 0
Burgandy & Hillsboro Court - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment communities acquired | apartmentUnit			251
Total acquisition cost			$ 35,569
Form of Consideration
Cash			2,092
Units			22,542
Other			10,935
Investment Allocation
Land			2,834
Building			31,148
Intangible Assets			1,587
Other			$ 0
Venue on Knox - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment communities acquired | apartmentUnit			97
Total acquisition cost			$ 18,896
Form of Consideration
Cash			500
Units			11,375
Other			7,021
Investment Allocation
Land			3,438
Building			14,743
Intangible Assets			715
Other			$ 0
Gatewood - St. Cloud, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment communities acquired | apartmentUnit			120
Total acquisition cost			$ 7,781
Form of Consideration
Cash			378
Units			3,388
Other			4,015
Investment Allocation
Land			327
Building			6,858
Intangible Assets			596
Other			$ 0
Grove Ridge - Cottage Grove, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment communities acquired | apartmentUnit			84
Total acquisition cost			$ 12,060
Form of Consideration
Cash			121
Units			8,579
Other			3,360
Investment Allocation
Land			1,250
Building			10,271
Intangible Assets			539
Other			$ 0
The Legacy - St. Cloud, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment communities acquired | apartmentUnit			119
Total acquisition cost			$ 10,560
Form of Consideration
Cash			229
Units			5,714
Other			4,617
Investment Allocation
Land			412
Building			9,556
Intangible Assets			592
Other			$ 0
New Hope Garden & Village - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment communities acquired | apartmentUnit			151
Total acquisition cost			$ 15,006
Form of Consideration
Cash			1,435
Units			10,812
Other			2,759
Investment Allocation
Land			1,603
Building			12,578
Intangible Assets			825
Other			$ 0
Palisades - Roseville, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment communities acquired | apartmentUnit			330
Total acquisition cost			$ 53,354
Form of Consideration
Cash			2,884
Units			30,470
Other			20,000
Investment Allocation
Land			6,919
Building			46,577
Intangible Assets			2,211
Other			$ (2,353)
Plymouth Pointe - Plymouth, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment communities acquired | apartmentUnit			96
Total acquisition cost			$ 14,450
Form of Consideration
Cash			370
Units			9,061
Other			5,019
Investment Allocation
Land			1,042
Building			12,809
Intangible Assets			599
Other			$ 0
Pointe West - St. Cloud, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment communities acquired | apartmentUnit			93
Total acquisition cost			$ 7,558
Form of Consideration
Cash			91
Units			3,605
Other			3,862
Investment Allocation
Land			246
Building			6,849
Intangible Assets			463
Other			$ 0
River Pointe - Fridley, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment communities acquired | apartmentUnit			301
Total acquisition cost			$ 38,348
Form of Consideration
Cash			2,249
Units			21,653
Other			14,446
Investment Allocation
Land			3,346
Building			33,117
Intangible Assets			1,885
Other			$ 0
Southdale Parc - Richfield, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment communities acquired | apartmentUnit			70
Total acquisition cost			$ 9,670
Form of Consideration
Cash			165
Units			7,907
Other			1,598
Investment Allocation
Land			1,569
Building			7,740
Intangible Assets			361
Other			$ 0
Portage - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment communities acquired | apartmentUnit			62
Total acquisition cost			$ 9,171
Form of Consideration
Cash			323
Units			5,588
Other			3,260
Investment Allocation
Land			2,133
Building			6,685
Intangible Assets			353
Other			$ 0
Windsor Gates - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment communities acquired | apartmentUnit			200
Total acquisition cost			$ 22,231
Form of Consideration
Cash			1,122
Units			12,080
Other			9,029
Investment Allocation
Land			2,140
Building			18,943
Intangible Assets			1,148
Other			$ 0
Wingate - New Hope, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment communities acquired | apartmentUnit			136
Total acquisition cost			$ 15,784
Form of Consideration
Cash			723
Units			10,246
Other			4,815
Investment Allocation
Land			1,480
Building			13,530
Intangible Assets			774
Other			$ 0
Woodhaven - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment communities acquired | apartmentUnit			178
Total acquisition cost			$ 25,009
Form of Consideration
Cash			1,682
Units			15,200
Other			8,127
Investment Allocation
Land			3,940
Building			20,080
Intangible Assets			989
Other			$ 0
Woodland Pointe - Woodbury, MN
Acquisitions and development projects placed in service [Abstract]
Number of apartment communities acquired | apartmentUnit			288
Total acquisition cost			$ 47,796
Form of Consideration
Cash			437
Units			29,438
Other			17,921
Investment Allocation
Land			5,367
Building			40,422
Intangible Assets			2,007
Other			$ 0
Civic Lofts - Denver, CO
Acquisitions and development projects placed in service [Abstract]
Number of apartment communities acquired | apartmentUnit			176
Total acquisition cost			$ 63,000
Form of Consideration
Cash			63,000
Units			0
Other			0
Investment Allocation
Land			6,166
Building			55,204
Intangible Assets			1,630
Other			$ 0