SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) apartmentCommunity	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Gross amount at which carries at close of period [Abstract]
Total	$ 2,420,146	$ 2,534,124	$ 2,271,170
Accumulated Depreciation	(530,703)	(535,401)	(443,592)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at beginning of year	2,534,124	2,271,170	1,812,557
Multifamily and Other	87,757	206,623	491,648
Improvements and Other	62,117	57,203	34,427
Total additions including opening balance	2,683,998	2,534,996	2,338,632
Cost of real estate sold	(243,889)	0	(57,698)
Impairment charge	(5,218)	0	0
Other	(14,745)	(872)	(9,764)
Balance at close of year	2,420,146	2,534,124	2,271,170
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at beginning of year	535,401	443,592	399,249
Additions during year
Provisions for depreciation	98,691	92,056	78,268
Deductions during year
Accumulated depreciation on real estate sold or classified as held for sale	(92,239)	0	(24,161)
Other	(11,150)	(247)	(9,764)
Balance at close of year	530,703	535,401	443,592
Total real estate investments, excluding mortgage notes receivable	$ 1,889,443	1,998,723	$ 1,827,578
Number of apartment communities impaired during year | apartmentCommunity	2
Net basis of real estate investments for federal income tax purposes	$ 1,400,000	$ 1,500,000
Multi Family Same-Store
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	462,396
Initial Cost to Company [Abstract]
Land	177,545
Buildings & Improvements	1,685,002
Costs capitalized subsequent to acquisition	243,970
Gross amount at which carries at close of period [Abstract]
Land	189,440
Buildings & Improvements	1,917,077
Total	2,106,517
Accumulated Depreciation	(512,452)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	2,106,517
Deductions during year
Balance at close of year	512,452
Multi Family Same-Store | 71 France - Edina, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	49,675
Initial Cost to Company [Abstract]
Land	4,721
Buildings & Improvements	61,762
Costs capitalized subsequent to acquisition	1,653
Gross amount at which carries at close of period [Abstract]
Land	4,801
Buildings & Improvements	63,335
Total	68,136
Accumulated Depreciation	(21,322)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	68,136
Deductions during year
Balance at close of year	$ 21,322
Multi Family Same-Store | 71 France - Edina, MN | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Alps Park Apartments - Rapid City, SD
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	287
Buildings & Improvements	5,551
Costs capitalized subsequent to acquisition	671
Gross amount at which carries at close of period [Abstract]
Land	336
Buildings & Improvements	6,173
Total	6,509
Accumulated Depreciation	(2,162)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	6,509
Deductions during year
Balance at close of year	$ 2,162
Multi Family Same-Store | Alps Park Apartments - Rapid City, SD | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Arcata Apartments - Golden Valley, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	2,088
Buildings & Improvements	31,036
Costs capitalized subsequent to acquisition	781
Gross amount at which carries at close of period [Abstract]
Land	2,128
Buildings & Improvements	31,777
Total	33,905
Accumulated Depreciation	(11,660)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	33,905
Deductions during year
Balance at close of year	$ 11,660
Multi Family Same-Store | Arcata Apartments - Golden Valley, MN | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Ashland Apartment Homes - Grand Forks, ND
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	741
Buildings & Improvements	7,569
Costs capitalized subsequent to acquisition	285
Gross amount at which carries at close of period [Abstract]
Land	823
Buildings & Improvements	7,772
Total	8,595
Accumulated Depreciation	(3,120)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	8,595
Deductions during year
Balance at close of year	$ 3,120
Multi Family Same-Store | Ashland Apartment Homes - Grand Forks, ND | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Avalon Cove Townhomes - Rochester, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	1,616
Buildings & Improvements	34,074
Costs capitalized subsequent to acquisition	4,984
Gross amount at which carries at close of period [Abstract]
Land	1,808
Buildings & Improvements	38,866
Total	40,674
Accumulated Depreciation	(10,222)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	40,674
Deductions during year
Balance at close of year	$ 10,222
Multi Family Same-Store | Avalon Cove Townhomes - Rochester, MN | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Bayberry Place - Eagan, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 11,048
Initial Cost to Company [Abstract]
Land	1,807
Buildings & Improvements	14,113
Costs capitalized subsequent to acquisition	1,637
Gross amount at which carries at close of period [Abstract]
Land	1,865
Buildings & Improvements	15,692
Total	17,557
Accumulated Depreciation	$ (1,347)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 17,557
Deductions during year
Balance at close of year	1,347
Multi Family Same-Store | Burgandy & Hillsboro - New Hope, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	23,570
Initial Cost to Company [Abstract]
Land	2,834
Buildings & Improvements	31,149
Costs capitalized subsequent to acquisition	2,132
Gross amount at which carries at close of period [Abstract]
Land	2,913
Buildings & Improvements	33,202
Total	36,115
Accumulated Depreciation	$ (3,066)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 36,115
Deductions during year
Balance at close of year	3,066
Multi Family Same-Store | Canyon Lake Apartments - Rapid City, SD
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	0
Initial Cost to Company [Abstract]
Land	305
Buildings & Improvements	3,958
Costs capitalized subsequent to acquisition	2,335
Gross amount at which carries at close of period [Abstract]
Land	420
Buildings & Improvements	6,178
Total	6,598
Accumulated Depreciation	(3,591)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	6,598
Deductions during year
Balance at close of year	$ 3,591
Multi Family Same-Store | Canyon Lake Apartments - Rapid City, SD | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Cardinal Point Apartments - Grand Forks, ND
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	1,600
Buildings & Improvements	33,400
Costs capitalized subsequent to acquisition	(111)
Gross amount at which carries at close of period [Abstract]
Land	1,727
Buildings & Improvements	33,162
Total	34,889
Accumulated Depreciation	(6,287)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	34,889
Deductions during year
Balance at close of year	$ 6,287
Multi Family Same-Store | Cardinal Point Apartments - Grand Forks, ND | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Cascade Shores Townhomes + Flats - Rochester, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 43,835
Initial Cost to Company [Abstract]
Land	6,588
Buildings & Improvements	67,072
Costs capitalized subsequent to acquisition	10,705
Gross amount at which carries at close of period [Abstract]
Land	6,776
Buildings & Improvements	77,589
Total	84,365
Accumulated Depreciation	(23,733)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	84,365
Deductions during year
Balance at close of year	$ 23,733
Multi Family Same-Store | Cascade Shores Townhomes + Flats - Rochester, MN | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Castlerock Apartment Homes - Billings, MT
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	736
Buildings & Improvements	4,864
Costs capitalized subsequent to acquisition	2,075
Gross amount at which carries at close of period [Abstract]
Land	1,045
Buildings & Improvements	6,630
Total	7,675
Accumulated Depreciation	(4,782)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	7,675
Deductions during year
Balance at close of year	$ 4,782
Multi Family Same-Store | Castlerock Apartment Homes - Billings, MT | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Civic Lofts - Denver, CO
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	6,166
Buildings & Improvements	55,182
Costs capitalized subsequent to acquisition	597
Gross amount at which carries at close of period [Abstract]
Land	6,171
Buildings & Improvements	55,774
Total	61,945
Accumulated Depreciation	$ (4,525)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 61,945
Deductions during year
Balance at close of year	4,525
Multi Family Same-Store | Connelly on Eleven - Burnsville, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	0
Initial Cost to Company [Abstract]
Land	2,401
Buildings & Improvements	11,515
Costs capitalized subsequent to acquisition	16,844
Gross amount at which carries at close of period [Abstract]
Land	3,206
Buildings & Improvements	27,554
Total	30,760
Accumulated Depreciation	(18,022)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	30,760
Deductions during year
Balance at close of year	$ 18,022
Multi Family Same-Store | Connelly on Eleven - Burnsville, MN | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Cottonwood Apartment Homes - Bismarck, ND
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	1,056
Buildings & Improvements	17,372
Costs capitalized subsequent to acquisition	6,823
Gross amount at which carries at close of period [Abstract]
Land	1,962
Buildings & Improvements	23,289
Total	25,251
Accumulated Depreciation	(14,117)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	25,251
Deductions during year
Balance at close of year	$ 14,117
Multi Family Same-Store | Cottonwood Apartment Homes - Bismarck, ND | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Country Meadows Apartment Homes - Billings, MT
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	491
Buildings & Improvements	7,809
Costs capitalized subsequent to acquisition	1,437
Gross amount at which carries at close of period [Abstract]
Land	599
Buildings & Improvements	9,138
Total	9,737
Accumulated Depreciation	(6,079)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	9,737
Deductions during year
Balance at close of year	$ 6,079
Multi Family Same-Store | Country Meadows Apartment Homes - Billings, MT | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Cypress Court Apartments - St. Cloud, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 10,697
Initial Cost to Company [Abstract]
Land	1,583
Buildings & Improvements	18,879
Costs capitalized subsequent to acquisition	1,074
Gross amount at which carries at close of period [Abstract]
Land	1,625
Buildings & Improvements	19,911
Total	21,536
Accumulated Depreciation	(7,089)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	21,536
Deductions during year
Balance at close of year	$ 7,089
Multi Family Same-Store | Cypress Court Apartments - St. Cloud, MN | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Deer Ridge Apartment Homes - Jamestown, ND
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	711
Buildings & Improvements	24,129
Costs capitalized subsequent to acquisition	814
Gross amount at which carries at close of period [Abstract]
Land	785
Buildings & Improvements	24,869
Total	25,654
Accumulated Depreciation	(8,883)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	25,654
Deductions during year
Balance at close of year	$ 8,883
Multi Family Same-Store | Deer Ridge Apartment Homes - Jamestown, ND | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Donovan Apartment Homes - Lincoln, NE
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	1,515
Buildings & Improvements	15,730
Costs capitalized subsequent to acquisition	8,263
Gross amount at which carries at close of period [Abstract]
Land	1,817
Buildings & Improvements	23,691
Total	25,508
Accumulated Depreciation	(8,980)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	25,508
Deductions during year
Balance at close of year	$ 8,980
Multi Family Same-Store | Donovan Apartment Homes - Lincoln, NE | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Dylan at RiNo - Denver, CO
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	12,155
Buildings & Improvements	77,215
Costs capitalized subsequent to acquisition	1,376
Gross amount at which carries at close of period [Abstract]
Land	12,241
Buildings & Improvements	78,505
Total	90,746
Accumulated Depreciation	$ (16,307)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 90,746
Deductions during year
Balance at close of year	16,307
Multi Family Same-Store | Evergreen Apartment Homes - Isanti, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	0
Initial Cost to Company [Abstract]
Land	1,129
Buildings & Improvements	5,524
Costs capitalized subsequent to acquisition	753
Gross amount at which carries at close of period [Abstract]
Land	1,159
Buildings & Improvements	6,247
Total	7,406
Accumulated Depreciation	(2,666)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	7,406
Deductions during year
Balance at close of year	$ 2,666
Multi Family Same-Store | Evergreen Apartment Homes - Isanti, MN | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | FreightYard Townhomes & Flats - Minneapolis, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	1,889
Buildings & Improvements	23,616
Costs capitalized subsequent to acquisition	1,447
Gross amount at which carries at close of period [Abstract]
Land	1,745
Buildings & Improvements	25,207
Total	26,952
Accumulated Depreciation	$ (4,006)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 26,952
Deductions during year
Balance at close of year	4,006
Multi Family Same-Store | Gardens Apartments - Grand Forks, ND
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	0
Initial Cost to Company [Abstract]
Land	518
Buildings & Improvements	8,702
Costs capitalized subsequent to acquisition	152
Gross amount at which carries at close of period [Abstract]
Land	535
Buildings & Improvements	8,837
Total	9,372
Accumulated Depreciation	(2,761)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	9,372
Deductions during year
Balance at close of year	$ 2,761
Multi Family Same-Store | Gardens Apartments - Grand Forks, ND | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Grand Gateway Apartment Homes - St. Cloud, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	814
Buildings & Improvements	7,086
Costs capitalized subsequent to acquisition	3,336
Gross amount at which carries at close of period [Abstract]
Land	970
Buildings & Improvements	10,266
Total	11,236
Accumulated Depreciation	(4,460)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	11,236
Deductions during year
Balance at close of year	$ 4,460
Multi Family Same-Store | Grand Gateway Apartment Homes - St. Cloud, MN | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Greenfield - Omaha, NE
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	578
Buildings & Improvements	4,122
Costs capitalized subsequent to acquisition	3,147
Gross amount at which carries at close of period [Abstract]
Land	876
Buildings & Improvements	6,971
Total	7,847
Accumulated Depreciation	(3,653)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	7,847
Deductions during year
Balance at close of year	$ 3,653
Multi Family Same-Store | Greenfield - Omaha, NE | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Grove Ridge - Cottage Grove, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 7,992
Initial Cost to Company [Abstract]
Land	1,250
Buildings & Improvements	10,271
Costs capitalized subsequent to acquisition	790
Gross amount at which carries at close of period [Abstract]
Land	1,293
Buildings & Improvements	11,018
Total	12,311
Accumulated Depreciation	$ (981)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 12,311
Deductions during year
Balance at close of year	981
Multi Family Same-Store | Homestead Garden Apartments - Rapid City, SD
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	0
Initial Cost to Company [Abstract]
Land	655
Buildings & Improvements	14,139
Costs capitalized subsequent to acquisition	1,783
Gross amount at which carries at close of period [Abstract]
Land	792
Buildings & Improvements	15,785
Total	16,577
Accumulated Depreciation	(5,006)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	16,577
Deductions during year
Balance at close of year	$ 5,006
Multi Family Same-Store | Homestead Garden Apartments - Rapid City, SD | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Ironwood - New Hope, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	2,165
Buildings & Improvements	36,874
Costs capitalized subsequent to acquisition	764
Gross amount at which carries at close of period [Abstract]
Land	2,167
Buildings & Improvements	37,636
Total	39,803
Accumulated Depreciation	$ (5,435)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 39,803
Deductions during year
Balance at close of year	5,435
Multi Family Same-Store | Lakeside Village Apartment Homes - Lincoln, NE
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	0
Initial Cost to Company [Abstract]
Land	1,215
Buildings & Improvements	15,837
Costs capitalized subsequent to acquisition	5,945
Gross amount at which carries at close of period [Abstract]
Land	1,476
Buildings & Improvements	21,521
Total	22,997
Accumulated Depreciation	(8,013)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	22,997
Deductions during year
Balance at close of year	$ 8,013
Multi Family Same-Store | Lakeside Village Apartment Homes - Lincoln, NE | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Legacy Apartments - Grand Forks, ND
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	1,362
Buildings & Improvements	21,727
Costs capitalized subsequent to acquisition	11,075
Gross amount at which carries at close of period [Abstract]
Land	2,474
Buildings & Improvements	31,690
Total	34,164
Accumulated Depreciation	(21,434)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	34,164
Deductions during year
Balance at close of year	$ 21,434
Multi Family Same-Store | Legacy Apartments - Grand Forks, ND | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Legacy Heights Apartment Homes - Bismarck, ND
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	1,207
Buildings & Improvements	13,742
Costs capitalized subsequent to acquisition	300
Gross amount at which carries at close of period [Abstract]
Land	1,142
Buildings & Improvements	14,107
Total	15,249
Accumulated Depreciation	(3,961)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	15,249
Deductions during year
Balance at close of year	$ 3,961
Multi Family Same-Store | Legacy Heights Apartment Homes - Bismarck, ND | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Lugano at Cherry Creek - Denver, CO
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	7,679
Buildings & Improvements	87,766
Costs capitalized subsequent to acquisition	8,410
Gross amount at which carries at close of period [Abstract]
Land	7,679
Buildings & Improvements	96,176
Total	103,855
Accumulated Depreciation	$ (15,386)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 103,855
Deductions during year
Balance at close of year	15,386
Multi Family Same-Store | Meadows Apartments - Jamestown, ND
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	0
Initial Cost to Company [Abstract]
Land	590
Buildings & Improvements	4,519
Costs capitalized subsequent to acquisition	1,992
Gross amount at which carries at close of period [Abstract]
Land	730
Buildings & Improvements	6,371
Total	7,101
Accumulated Depreciation	(4,133)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	7,101
Deductions during year
Balance at close of year	$ 4,133
Multi Family Same-Store | Meadows Apartments - Jamestown, ND | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Monticello Crossings - Monticello, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	1,734
Buildings & Improvements	30,136
Costs capitalized subsequent to acquisition	556
Gross amount at which carries at close of period [Abstract]
Land	1,951
Buildings & Improvements	30,475
Total	32,426
Accumulated Depreciation	(8,329)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	32,426
Deductions during year
Balance at close of year	$ 8,329
Multi Family Same-Store | Monticello Crossings - Monticello, MN | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Monticello Village - Monticello, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	490
Buildings & Improvements	3,756
Costs capitalized subsequent to acquisition	1,206
Gross amount at which carries at close of period [Abstract]
Land	655
Buildings & Improvements	4,797
Total	5,452
Accumulated Depreciation	(2,924)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	5,452
Deductions during year
Balance at close of year	$ 2,924
Multi Family Same-Store | Monticello Village - Monticello, MN | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | New Hope Garden & Village - New Hope, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 9,943
Initial Cost to Company [Abstract]
Land	1,603
Buildings & Improvements	12,578
Costs capitalized subsequent to acquisition	1,393
Gross amount at which carries at close of period [Abstract]
Land	1,651
Buildings & Improvements	13,923
Total	15,574
Accumulated Depreciation	$ (1,419)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 15,574
Deductions during year
Balance at close of year	1,419
Multi Family Same-Store | Northridge Apartments - Bismarck, ND
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	0
Initial Cost to Company [Abstract]
Land	884
Buildings & Improvements	7,515
Costs capitalized subsequent to acquisition	280
Gross amount at which carries at close of period [Abstract]
Land	1,048
Buildings & Improvements	7,631
Total	8,679
Accumulated Depreciation	(2,412)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	8,679
Deductions during year
Balance at close of year	$ 2,412
Multi Family Same-Store | Northridge Apartments - Bismarck, ND | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Olympic Village Apartments - Billings, MT
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	1,164
Buildings & Improvements	10,441
Costs capitalized subsequent to acquisition	4,174
Gross amount at which carries at close of period [Abstract]
Land	1,885
Buildings & Improvements	13,894
Total	15,779
Accumulated Depreciation	(9,224)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	15,779
Deductions during year
Balance at close of year	$ 9,224
Multi Family Same-Store | Olympic Village Apartments - Billings, MT | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Oxbo Urban Rentals - St Paul, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	5,809
Buildings & Improvements	51,586
Costs capitalized subsequent to acquisition	711
Gross amount at which carries at close of period [Abstract]
Land	5,822
Buildings & Improvements	52,284
Total	58,106
Accumulated Depreciation	$ (11,861)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 58,106
Deductions during year
Balance at close of year	11,861
Multi Family Same-Store | Palisades - Roseville, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	21,622
Initial Cost to Company [Abstract]
Land	6,919
Buildings & Improvements	46,577
Costs capitalized subsequent to acquisition	4,806
Gross amount at which carries at close of period [Abstract]
Land	6,959
Buildings & Improvements	51,343
Total	58,302
Accumulated Depreciation	$ (4,233)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 58,302
Deductions during year
Balance at close of year	4,233
Multi Family Same-Store | Park Place Apartments - Plymouth, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	0
Initial Cost to Company [Abstract]
Land	10,609
Buildings & Improvements	80,781
Costs capitalized subsequent to acquisition	20,098
Gross amount at which carries at close of period [Abstract]
Land	10,819
Buildings & Improvements	100,669
Total	111,488
Accumulated Depreciation	(26,469)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	111,488
Deductions during year
Balance at close of year	26,469
Multi Family Same-Store | Parkhouse Apartment Homes - Thornton, CO
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	89,239
Initial Cost to Company [Abstract]
Land	10,474
Buildings & Improvements	132,105
Costs capitalized subsequent to acquisition	3,074
Gross amount at which carries at close of period [Abstract]
Land	10,484
Buildings & Improvements	135,169
Total	145,653
Accumulated Depreciation	$ (17,666)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 145,653
Deductions during year
Balance at close of year	17,666
Multi Family Same-Store | Plymouth Pointe - Plymouth, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	9,575
Initial Cost to Company [Abstract]
Land	1,042
Buildings & Improvements	12,810
Costs capitalized subsequent to acquisition	340
Gross amount at which carries at close of period [Abstract]
Land	1,073
Buildings & Improvements	13,119
Total	14,192
Accumulated Depreciation	$ (1,261)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 14,192
Deductions during year
Balance at close of year	1,261
Multi Family Same-Store | Pointe West Apartments - Rapid City, SD
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	0
Initial Cost to Company [Abstract]
Land	240
Buildings & Improvements	3,538
Costs capitalized subsequent to acquisition	2,075
Gross amount at which carries at close of period [Abstract]
Land	463
Buildings & Improvements	5,390
Total	5,853
Accumulated Depreciation	(4,267)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	5,853
Deductions during year
Balance at close of year	$ 4,267
Multi Family Same-Store | Pointe West Apartments - Rapid City, SD | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Ponds at Heritage Place - Sartell, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	395
Buildings & Improvements	4,564
Costs capitalized subsequent to acquisition	510
Gross amount at which carries at close of period [Abstract]
Land	419
Buildings & Improvements	5,050
Total	5,469
Accumulated Depreciation	(2,059)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	5,469
Deductions during year
Balance at close of year	$ 2,059
Multi Family Same-Store | Ponds at Heritage Place - Sartell, MN | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Prosper West - Waite Park, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 16,425
Initial Cost to Company [Abstract]
Land	939
Buildings & Improvements	10,167
Costs capitalized subsequent to acquisition	17,929
Gross amount at which carries at close of period [Abstract]
Land	1,912
Buildings & Improvements	27,123
Total	29,035
Accumulated Depreciation	(16,762)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	29,035
Deductions during year
Balance at close of year	$ 16,762
Multi Family Same-Store | Prosper West - Waite Park, MN | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Quarry Ridge Apartments - Rochester, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	2,254
Buildings & Improvements	30,024
Costs capitalized subsequent to acquisition	9,493
Gross amount at which carries at close of period [Abstract]
Land	2,412
Buildings & Improvements	39,359
Total	41,771
Accumulated Depreciation	(16,051)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	41,771
Deductions during year
Balance at close of year	$ 16,051
Multi Family Same-Store | Quarry Ridge Apartments - Rochester, MN | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Red 20 Apartments - Minneapolis, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 19,718
Initial Cost to Company [Abstract]
Land	1,900
Buildings & Improvements	24,116
Costs capitalized subsequent to acquisition	809
Gross amount at which carries at close of period [Abstract]
Land	1,908
Buildings & Improvements	24,917
Total	26,825
Accumulated Depreciation	(9,063)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	26,825
Deductions during year
Balance at close of year	$ 9,063
Multi Family Same-Store | Red 20 Apartments - Minneapolis, MN | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Regency Park Estates - St. Cloud, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 6,669
Initial Cost to Company [Abstract]
Land	702
Buildings & Improvements	10,198
Costs capitalized subsequent to acquisition	8,683
Gross amount at which carries at close of period [Abstract]
Land	1,179
Buildings & Improvements	18,404
Total	19,583
Accumulated Depreciation	(7,676)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	19,583
Deductions during year
Balance at close of year	$ 7,676
Multi Family Same-Store | Regency Park Estates - St. Cloud, MN | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Rimrock West Apartments - Billings, MT
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	330
Buildings & Improvements	3,489
Costs capitalized subsequent to acquisition	1,883
Gross amount at which carries at close of period [Abstract]
Land	568
Buildings & Improvements	5,134
Total	5,702
Accumulated Depreciation	(3,588)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	5,702
Deductions during year
Balance at close of year	$ 3,588
Multi Family Same-Store | Rimrock West Apartments - Billings, MT | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | River Pointe - Fridley, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 25,412
Initial Cost to Company [Abstract]
Land	3,346
Buildings & Improvements	33,118
Costs capitalized subsequent to acquisition	5,515
Gross amount at which carries at close of period [Abstract]
Land	3,426
Buildings & Improvements	38,553
Total	41,979
Accumulated Depreciation	$ (3,750)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 41,979
Deductions during year
Balance at close of year	3,750
Multi Family Same-Store | River Ridge Apartment Homes - Bismarck, ND
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	0
Initial Cost to Company [Abstract]
Land	576
Buildings & Improvements	24,670
Costs capitalized subsequent to acquisition	1,432
Gross amount at which carries at close of period [Abstract]
Land	922
Buildings & Improvements	25,756
Total	26,678
Accumulated Depreciation	(10,811)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	26,678
Deductions during year
Balance at close of year	$ 10,811
Multi Family Same-Store | River Ridge Apartment Homes - Bismarck, ND | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Rocky Meadows Apartments - Billings, MT
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	656
Buildings & Improvements	5,726
Costs capitalized subsequent to acquisition	1,511
Gross amount at which carries at close of period [Abstract]
Land	840
Buildings & Improvements	7,053
Total	7,893
Accumulated Depreciation	(5,019)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	7,893
Deductions during year
Balance at close of year	$ 5,019
Multi Family Same-Store | Rocky Meadows Apartments - Billings, MT | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Rum River Apartments - Isanti, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	843
Buildings & Improvements	4,823
Costs capitalized subsequent to acquisition	533
Gross amount at which carries at close of period [Abstract]
Land	870
Buildings & Improvements	5,329
Total	6,199
Accumulated Depreciation	(2,632)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	6,199
Deductions during year
Balance at close of year	$ 2,632
Multi Family Same-Store | Rum River Apartments - Isanti, MN | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Silver Springs Apartment Homes - Rapid City, SD
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	215
Buildings & Improvements	3,007
Costs capitalized subsequent to acquisition	1,046
Gross amount at which carries at close of period [Abstract]
Land	273
Buildings & Improvements	3,995
Total	4,268
Accumulated Depreciation	(1,376)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	4,268
Deductions during year
Balance at close of year	$ 1,376
Multi Family Same-Store | Silver Springs Apartment Homes - Rapid City, SD | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Southdale Parc - Richfield, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 5,301
Initial Cost to Company [Abstract]
Land	1,569
Buildings & Improvements	7,740
Costs capitalized subsequent to acquisition	(2,205)
Gross amount at which carries at close of period [Abstract]
Land	1,618
Buildings & Improvements	5,486
Total	7,104
Accumulated Depreciation	$ (780)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 7,104
Deductions during year
Balance at close of year	780
Multi Family Same-Store | SouthFork Townhomes + Flats - Lakeville, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	21,675
Initial Cost to Company [Abstract]
Land	3,502
Buildings & Improvements	40,153
Costs capitalized subsequent to acquisition	11,288
Gross amount at which carries at close of period [Abstract]
Land	3,583
Buildings & Improvements	51,360
Total	54,943
Accumulated Depreciation	$ (12,684)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 54,943
Deductions during year
Balance at close of year	12,684
Multi Family Same-Store | Southpoint Apartments - Grand Forks, ND
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	0
Initial Cost to Company [Abstract]
Land	576
Buildings & Improvements	9,893
Costs capitalized subsequent to acquisition	409
Gross amount at which carries at close of period [Abstract]
Land	663
Buildings & Improvements	10,215
Total	10,878
Accumulated Depreciation	(3,432)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	10,878
Deductions during year
Balance at close of year	$ 3,432
Multi Family Same-Store | Southpoint Apartments - Grand Forks, ND | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Sunset Trail Apartment Homes - Rochester, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	336
Buildings & Improvements	12,814
Costs capitalized subsequent to acquisition	5,961
Gross amount at which carries at close of period [Abstract]
Land	826
Buildings & Improvements	18,285
Total	19,111
Accumulated Depreciation	(10,340)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	19,111
Deductions during year
Balance at close of year	$ 10,340
Multi Family Same-Store | Sunset Trail Apartment Homes - Rochester, MN | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Union Pointe - Longmont, CO
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	5,727
Buildings & Improvements	69,966
Costs capitalized subsequent to acquisition	678
Gross amount at which carries at close of period [Abstract]
Land	5,736
Buildings & Improvements	70,635
Total	76,371
Accumulated Depreciation	$ (8,307)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 76,371
Deductions during year
Balance at close of year	8,307
Multi Family Same-Store | Venue on Knox - Minneapolis, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	11,660
Initial Cost to Company [Abstract]
Land	3,438
Buildings & Improvements	14,743
Costs capitalized subsequent to acquisition	5,997
Gross amount at which carries at close of period [Abstract]
Land	3,530
Buildings & Improvements	20,648
Total	24,178
Accumulated Depreciation	$ (2,074)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 24,178
Deductions during year
Balance at close of year	2,074
Multi Family Same-Store | Westend - Denver, CO
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	0
Initial Cost to Company [Abstract]
Land	25,525
Buildings & Improvements	102,180
Costs capitalized subsequent to acquisition	1,578
Gross amount at which carries at close of period [Abstract]
Land	25,532
Buildings & Improvements	103,751
Total	129,283
Accumulated Depreciation	$ (20,846)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 129,283
Deductions during year
Balance at close of year	20,846
Multi Family Same-Store | Whispering Ridge - Omaha, NE
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	21,800
Initial Cost to Company [Abstract]
Land	2,139
Buildings & Improvements	25,424
Costs capitalized subsequent to acquisition	5,595
Gross amount at which carries at close of period [Abstract]
Land	2,551
Buildings & Improvements	30,607
Total	33,158
Accumulated Depreciation	(11,771)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	33,158
Deductions during year
Balance at close of year	$ 11,771
Multi Family Same-Store | Whispering Ridge - Omaha, NE | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Multi Family Same-Store | Wingate - New Hope, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 10,459
Initial Cost to Company [Abstract]
Land	1,480
Buildings & Improvements	13,530
Costs capitalized subsequent to acquisition	(1,032)
Gross amount at which carries at close of period [Abstract]
Land	1,526
Buildings & Improvements	12,452
Total	13,978
Accumulated Depreciation	$ (1,422)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 13,978
Deductions during year
Balance at close of year	1,422
Multi Family Same-Store | Woodhaven - Minneapolis, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	14,408
Initial Cost to Company [Abstract]
Land	3,940
Buildings & Improvements	20,080
Costs capitalized subsequent to acquisition	1,891
Gross amount at which carries at close of period [Abstract]
Land	4,040
Buildings & Improvements	21,871
Total	25,911
Accumulated Depreciation	$ (1,849)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 25,911
Deductions during year
Balance at close of year	1,849
Multi Family Same-Store | Woodland Pointe - Woodbury, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	31,673
Initial Cost to Company [Abstract]
Land	5,367
Buildings & Improvements	40,422
Costs capitalized subsequent to acquisition	15,422
Gross amount at which carries at close of period [Abstract]
Land	5,449
Buildings & Improvements	55,762
Total	61,211
Accumulated Depreciation	$ (5,160)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 61,211
Deductions during year
Balance at close of year	5,160
Multi Family Same-Store | Woodridge on Second - Rochester, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	0
Initial Cost to Company [Abstract]
Land	370
Buildings & Improvements	6,028
Costs capitalized subsequent to acquisition	6,062
Gross amount at which carries at close of period [Abstract]
Land	761
Buildings & Improvements	11,699
Total	12,460
Accumulated Depreciation	(7,746)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	12,460
Deductions during year
Balance at close of year	$ 7,746
Multi Family Same-Store | Woodridge on Second - Rochester, MN | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
MultiFamily Non-Same-Store
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 127,594
Initial Cost to Company [Abstract]
Land	20,430
Buildings & Improvements	272,796
Costs capitalized subsequent to acquisition	2,801
Gross amount at which carries at close of period [Abstract]
Land	20,503
Buildings & Improvements	275,524
Total	296,027
Accumulated Depreciation	(14,113)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	296,027
Deductions during year
Balance at close of year	14,113
MultiFamily Non-Same-Store | Elements of Linden Hills - Minneapolis, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	5,842
Initial Cost to Company [Abstract]
Land	941
Buildings & Improvements	7,853
Costs capitalized subsequent to acquisition	290
Gross amount at which carries at close of period [Abstract]
Land	949
Buildings & Improvements	8,135
Total	9,084
Accumulated Depreciation	$ (686)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 9,084
Deductions during year
Balance at close of year	686
MultiFamily Non-Same-Store | Lake Vista Apartments Homes - Loveland, CO
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	49,033
Initial Cost to Company [Abstract]
Land	6,618
Buildings & Improvements	80,737
Costs capitalized subsequent to acquisition	434
Gross amount at which carries at close of period [Abstract]
Land	6,649
Buildings & Improvements	81,140
Total	87,789
Accumulated Depreciation	$ (885)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 87,789
Deductions during year
Balance at close of year	885
MultiFamily Non-Same-Store | Lyra Apartments - Centennial, CO
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	37,809
Initial Cost to Company [Abstract]
Land	6,473
Buildings & Improvements	86,149
Costs capitalized subsequent to acquisition	423
Gross amount at which carries at close of period [Abstract]
Land	6,481
Buildings & Improvements	86,564
Total	93,045
Accumulated Depreciation	$ (4,500)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 93,045
Deductions during year
Balance at close of year	4,500
MultiFamily Non-Same-Store | Martin Blu - Eden Prairie, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	27,193
Initial Cost to Company [Abstract]
Land	3,547
Buildings & Improvements	45,212
Costs capitalized subsequent to acquisition	866
Gross amount at which carries at close of period [Abstract]
Land	3,560
Buildings & Improvements	46,065
Total	49,625
Accumulated Depreciation	$ (3,756)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 49,625
Deductions during year
Balance at close of year	3,756
MultiFamily Non-Same-Store | Noko Apartments - Minneapolis, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	0
Initial Cost to Company [Abstract]
Land	1,915
Buildings & Improvements	42,636
Costs capitalized subsequent to acquisition	295
Gross amount at which carries at close of period [Abstract]
Land	1,918
Buildings & Improvements	42,928
Total	44,846
Accumulated Depreciation	$ (3,401)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 44,846
Deductions during year
Balance at close of year	3,401
MultiFamily Non-Same-Store | Zest - Minneapolis, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	7,717
Initial Cost to Company [Abstract]
Land	936
Buildings & Improvements	10,209
Costs capitalized subsequent to acquisition	493
Gross amount at which carries at close of period [Abstract]
Land	946
Buildings & Improvements	10,692
Total	11,638
Accumulated Depreciation	$ (885)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 11,638
Deductions during year
Balance at close of year	885
Total Multifamily
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	589,990
Initial Cost to Company [Abstract]
Land	197,975
Buildings & Improvements	1,957,798
Costs capitalized subsequent to acquisition	246,771
Gross amount at which carries at close of period [Abstract]
Land	209,943
Buildings & Improvements	2,192,601
Total	2,402,544
Accumulated Depreciation	(526,565)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	2,402,544
Deductions during year
Balance at close of year	526,565
Other - Mixed Use
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	0
Initial Cost to Company [Abstract]
Land	0
Buildings & Improvements	13,646
Costs capitalized subsequent to acquisition	1,966
Gross amount at which carries at close of period [Abstract]
Land	0
Buildings & Improvements	15,612
Total	15,612
Accumulated Depreciation	(3,776)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	15,612
Deductions during year
Balance at close of year	3,776
Other - Mixed Use | 71 France - Edina, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	0
Initial Cost to Company [Abstract]
Land	0
Buildings & Improvements	5,879
Costs capitalized subsequent to acquisition	616
Gross amount at which carries at close of period [Abstract]
Land	0
Buildings & Improvements	6,495
Total	6,495
Accumulated Depreciation	(1,665)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	6,495
Deductions during year
Balance at close of year	$ 1,665
Other - Mixed Use | 71 France - Edina, MN | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Other - Mixed Use | Civic Lofts - Denver, CO
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	0
Buildings & Improvements	0
Costs capitalized subsequent to acquisition	0
Gross amount at which carries at close of period [Abstract]
Land	0
Buildings & Improvements	0
Total	0
Accumulated Depreciation	$ 0
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 0
Deductions during year
Balance at close of year	0
Other - Mixed Use | Lugano at Cherry Creek - Denver, CO
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	0
Initial Cost to Company [Abstract]
Land	0
Buildings & Improvements	1,600
Costs capitalized subsequent to acquisition	861
Gross amount at which carries at close of period [Abstract]
Land	0
Buildings & Improvements	2,461
Total	2,461
Accumulated Depreciation	$ (350)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 2,461
Deductions during year
Balance at close of year	350
Other - Mixed Use | Zest - Minneapolis, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	0
Initial Cost to Company [Abstract]
Land	0
Buildings & Improvements	52
Costs capitalized subsequent to acquisition	1
Gross amount at which carries at close of period [Abstract]
Land	0
Buildings & Improvements	53
Total	53
Accumulated Depreciation	$ (19)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 53
Deductions during year
Balance at close of year	19
Other - Mixed Use | Noko - Minneapolis, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	0
Initial Cost to Company [Abstract]
Land	0
Buildings & Improvements	118
Costs capitalized subsequent to acquisition	0
Gross amount at which carries at close of period [Abstract]
Land	0
Buildings & Improvements	118
Total	118
Accumulated Depreciation	$ (17)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 118
Deductions during year
Balance at close of year	17
Other - Mixed Use | 191 homes - Oxbo - St Paul, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	0
Initial Cost to Company [Abstract]
Land	0
Buildings & Improvements	3,472
Costs capitalized subsequent to acquisition	54
Gross amount at which carries at close of period [Abstract]
Land	0
Buildings & Improvements	3,526
Total	3,526
Accumulated Depreciation	$ (728)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 3,526
Deductions during year
Balance at close of year	728
Other - Mixed Use | Red 20 - Minneapolis, MN
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	0
Initial Cost to Company [Abstract]
Land	0
Buildings & Improvements	2,525
Costs capitalized subsequent to acquisition	434
Gross amount at which carries at close of period [Abstract]
Land	0
Buildings & Improvements	2,959
Total	2,959
Accumulated Depreciation	(997)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	2,959
Deductions during year
Balance at close of year	$ 997
Other - Mixed Use | Red 20 - Minneapolis, MN | Maximum
Gross amount at which carries at close of period [Abstract]
Life on which depreciation in latest income statement is computed	37 years
Other - Commercial
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	$ 0
Initial Cost to Company [Abstract]
Land	246
Buildings & Improvements	1,866
Costs capitalized subsequent to acquisition	(122)
Gross amount at which carries at close of period [Abstract]
Land	246
Buildings & Improvements	1,744
Total	1,990
Accumulated Depreciation	(362)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	1,990
Deductions during year
Balance at close of year	362
Other - Commercial | 3100 10th St SW - Minot, ND
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	0
Initial Cost to Company [Abstract]
Land	246
Buildings & Improvements	1,866
Costs capitalized subsequent to acquisition	(122)
Gross amount at which carries at close of period [Abstract]
Land	246
Buildings & Improvements	1,744
Total	1,990
Accumulated Depreciation	$ (362)
Life on which depreciation in latest income statement is computed	30 years
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	$ 1,990
Deductions during year
Balance at close of year	362
Total
Real Estate And Accumulated Depreciation [Abstract]
Encumbrances	589,990
Initial Cost to Company [Abstract]
Land	198,221
Buildings & Improvements	1,973,310
Costs capitalized subsequent to acquisition	248,615
Gross amount at which carries at close of period [Abstract]
Land	210,189
Buildings & Improvements	2,209,957
Total	2,420,146
Accumulated Depreciation	(530,703)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at close of year	2,420,146
Deductions during year
Balance at close of year	$ 530,703