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ACQUISITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE AND DISPOSITIONS - Property Dispositions (Details) $ in Thousands | 2 Months Ended | 3 Months Ended | 8 Months Ended | 12 Months Ended
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Dec. 31, 2018 USD ($) ft² unit | Oct. 31, 2018 USD ($) | Jul. 31, 2018 USD ($) | Apr. 30, 2018 USD ($) ft² unit apartment_community | Jan. 31, 2018 USD ($) | Oct. 31, 2017 USD ($) | Jul. 31, 2017 USD ($) | Apr. 30, 2017 USD ($) ft² property | Jan. 31, 2017 USD ($) | Oct. 31, 2016 USD ($) | Jul. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) ft² property unit | Dec. 31, 2017 USD ($) | Apr. 30, 2018 USD ($) ft² property unit apartment_community | Apr. 30, 2017 USD ($) ft² property | Apr. 30, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price | $ 30,287 | $ 45,638 | $ 45,946 | $ 44,185 | $ 42,716 | $ 41,866 | $ 40,978 | $ 42,811 | $ 39,797 | $ 39,195 | $ 38,301 | $ 121,871 | $ 111,249 | $ 169,745 | $ 160,104 | $ 145,500
Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  | 63,357 |  | 515,130 | 286,926 |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | $ 9,707 |  | 184,268 | 74,949 |
Retail Site | Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | property |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |
Multi-Family Residential | Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | property |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  | $ 41,500 |  | 18,913 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 8,453 |  | 3,343 |  |
Multi-Family Residential | Disposed of by Sale | Dakota Commons Williston Nd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  | 4,420 |  |  |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | $ 542 |  |  |  |
Number of apartment units, dispositions | unit | 44 |  |  |  |  |  |  |  |  |  |  | 44 |  |  |  |
Multi-Family Residential | Disposed of by Sale | Williston Garden Williston Nd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  | $ 12,310 |  |  |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | $ 997 |  |  |  |
Number of apartment units, dispositions | unit | 145 |  |  |  |  |  |  |  |  |  |  | 145 |  |  |  |
Interest in joint venture | 74.11% |  |  |  |  |  |  |  |  |  |  | 74.11% |  |  |  |
Multi-Family Residential | Disposed of by Sale | Renaissance Heights Williston Nd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  | $ 24,770 |  |  |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | $ 6,914 |  |  |  |
Number of apartment units, dispositions | unit | 288 |  |  |  |  |  |  |  |  |  |  | 288 |  |  |  |
Interest in joint venture | 87.14% |  |  |  |  |  |  |  |  |  |  | 87.14% |  |  |  |
Multi-Family Residential | Disposed of by Sale | Multifamily 327 Unit Minot Nd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,263 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 701 |  |
Number of apartment units, dispositions | unit |  |  |  | 327 |  |  |  |  |  |  |  |  |  | 327 |  |
Number of apartment communities | apartment_community |  |  |  | 13 |  |  |  |  |  |  |  |  |  | 13 |  |
Multi-Family Residential | Disposed of by Sale | Crown - Rochester, MN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,700 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,382 |  |
Number of apartment units, dispositions | unit |  |  |  | 48 |  |  |  |  |  |  |  |  |  | 48 |  |
Multi-Family Residential | Disposed of by Sale | Northern Valley - Rochester, MN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 950 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 260 |  |
Number of apartment units, dispositions | unit |  |  |  | 16 |  |  |  |  |  |  |  |  |  | 16 |  |
Multi-Family Residential | Disposed of by Sale | Pinecone Villas Sartell Mn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,540 |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 808 |
Number of apartment units, dispositions | property |  |  |  |  |  |  |  | 24 |  |  |  |  |  |  | 24 |
Other | Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  | $ 16,707 |  | $ 493,042 | $ 17,400 |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 1,302 |  | 180,938 | 11,419 |
Other | Disposed of by Sale | Minot Southgate Retail - Minot, ND |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  | 1,925 |  | 3,440 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | $ (131) |  | $ 108 |  |
Area of real estate property | ft² | 7,849 |  |  | 4,998 |  |  |  |  |  |  |  | 7,849 |  | 4,998 |  |
Other | Disposed of by Sale | Fresenius - Duluth, MN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  | $ 1,900 |  |  |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | $ 822 |  |  |  |
Area of real estate property | ft² | 9,052 |  |  |  |  |  |  |  |  |  |  | 9,052 |  |  |  |
Other | Disposed of by Sale | Minot 2505 16th Street SW - Minot, ND |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  | $ 1,710 |  |  |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | $ (104) |  |  |  |
Area of real estate property | ft² | 15,000 |  |  |  |  |  |  |  |  |  |  | 15,000 |  |  |  |
Other | Disposed of by Sale | 81594 Sq Ft Minot Arrowhead - Minot, ND |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  | $ 6,622 |  |  |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | $ 715 |  |  |  |
Area of real estate property | ft² | 81,594 |  |  |  |  |  |  |  |  |  |  | 81,594 |  |  |  |
Other | Disposed of by Sale | Bloomington 2000 W 94th Street - Bloomington, MN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  | $ 4,550 |  |  |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |
Area of real estate property | ft² | 100,850 |  |  |  |  |  |  |  |  |  |  | 100,850 |  |  |  |
Other | Disposed of by Sale | Lexington Commerce Center Eagan Mn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,000 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,037 |  |
Area of real estate property | ft² |  |  |  | 90,260 |  |  |  |  |  |  |  |  |  | 90,260 |  |
Other | Disposed of by Sale | Eagan 1440 Duckwood Medical - Eagan, MN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,100 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 214 |  |
Area of real estate property | ft² |  |  |  | 17,640 |  |  |  |  |  |  |  |  |  | 17,640 |  |
Other | Disposed of by Sale | Edgewood Vista Hermantown Mn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 36,884 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,187 |  |
Area of real estate property | ft² |  |  |  | 279,834 |  |  |  |  |  |  |  |  |  | 279,834 |  |
Other | Disposed of by Sale | Urbandale - Urbandale IA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,700 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,843 |  |
Area of real estate property | ft² |  |  |  | 518,161 |  |  |  |  |  |  |  |  |  | 518,161 |  |
Other | Disposed of by Sale | Long Lake Road - Roseville MN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,650 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,884 |  |
Area of real estate property | ft² |  |  |  | 36,053 |  |  |  |  |  |  |  |  |  | 36,053 |  |
Other | Disposed of by Sale | Healthcare Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | property |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 370,268 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 137,490 |  |
Area of real estate property | ft² |  |  |  | 1,205,432 |  |  |  |  |  |  |  |  |  | 1,205,432 |  |
Other | Disposed of by Sale | Garden View - St. Paul MN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,000 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,809 |  |
Area of real estate property | ft² |  |  |  | 43,404 |  |  |  |  |  |  |  |  |  | 43,404 |  |
Other | Disposed of by Sale | Ritchie Medical - St. Paul MN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,500 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,081 |  |
Area of real estate property | ft² |  |  |  | 52,116 |  |  |  |  |  |  |  |  |  | 52,116 |  |
Other | Disposed of by Sale | Bismarck 715 East Broadway - Bismarck, ND |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,500 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,285 |  |
Area of real estate property | ft² |  |  |  | 22,187 |  |  |  |  |  |  |  |  |  | 22,187 |  |
Other | Disposed of by Sale | Stone Container Fargo Nd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,400 |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,982 |
Area of real estate property | ft² |  |  |  |  |  |  |  | 195,075 |  |  |  |  |  |  | 195,075 |
Other | Disposed of by Sale | Grand Forks Carmike Grand Forks Nd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,000 |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,437 |
Area of real estate property | ft² |  |  |  |  |  |  |  | 28,528 |  |  |  |  |  |  | 28,528 |
Unimproved Land | Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | property |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  | $ 5,150 |  |  |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | (48) |  |  |  |
Unimproved Land | Disposed of by Sale | Grand Forks Grand Forks Nd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  | 3,000 |  |  |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | 14 |  |  |  |
Unimproved Land | Disposed of by Sale | Renaissance Heights Unimproved |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  | 750 |  |  |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | $ 66 |  |  |  |
Interest in joint venture | 70.00% |  |  |  |  |  |  |  |  |  |  | 70.00% |  |  |  |
Unimproved Land | Disposed of by Sale | Badger Hills - Rochester, MN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  | $ 1,400 |  |  |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  | (128) |  |  |  |
Unimproved Land | Disposed of by Sale | Bismarck 4916 - Bismarck, ND |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,175 |  |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | (13) |  |
Unimproved Land | Disposed of by Sale | Grand Chute, Wisconsin, Unimproved Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 250 |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (24) |
Healthcare | Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 265,736 |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 62,746 |
Healthcare | Disposed of by Sale | Idaho Spring Creek Senior Housing Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 43,900 |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,503 |
Area of real estate property | ft² |  |  |  |  |  |  |  | 189,244 |  |  |  |  |  |  | 189,244 |
Healthcare | Disposed of by Sale | Five Edgewood Vista Senior Housing Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 69,928 |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19,535 |
Area of real estate property | ft² |  |  |  |  |  |  |  | 426,652 |  |  |  |  |  |  | 426,652 |
Healthcare | Disposed of by Sale | Wyoming Senior Housing Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 49,600 |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,131 |
Area of real estate property | ft² |  |  |  |  |  |  |  | 286,854 |  |  |  |  |  |  | 286,854 |
Healthcare | Disposed of by Sale | Nine Edgewood Vista Senior Housing Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,700 |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,619 |
Area of real estate property | ft² |  |  |  |  |  |  |  | 169,001 |  |  |  |  |  |  | 169,001 |
Healthcare | Disposed of by Sale | Four Edgewood Vista Senior Housing Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 35,348 |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,837 |
Area of real estate property | ft² |  |  |  |  |  |  |  | 169,562 |  |  |  |  |  |  | 169,562 |
Healthcare | Disposed of by Sale | Healtheast St John And Woodwinds Maplewood And Woodbury Mn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,700 |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,923 |
Area of real estate property | ft² |  |  |  |  |  |  |  | 114,316 |  |  |  |  |  |  | 114,316 |
Healthcare | Disposed of by Sale | Sartell 2000 23 Rd Street South Sartell Mn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,600 |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (323) |
Area of real estate property | ft² |  |  |  |  |  |  |  | 59,760 |  |  |  |  |  |  | 59,760 |
Healthcare | Disposed of by Sale | Legends At Heritage Place Sartell Mn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,960 |
Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,479) |
Area of real estate property | ft² |  |  |  |  |  |  |  | 98,174 |  |  |  |  |  |  | 98,174 |
Real Estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  | 50,719 |  | 73,034 | $ 64,326 | $ 58,148
Real Estate | Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  | 53,650 |  | 330,862 | 211,977 |
Real Estate | Multi-Family Residential | Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  | 33,047 |  | 15,570 |  |
Real Estate | Multi-Family Residential | Disposed of by Sale | Dakota Commons Williston Nd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  | 3,878 |  |  |  |
Real Estate | Multi-Family Residential | Disposed of by Sale | Williston Garden Williston Nd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  | 11,313 |  |  |  |
Real Estate | Multi-Family Residential | Disposed of by Sale | Renaissance Heights Williston Nd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  | 17,856 |  |  |  |
Real Estate | Multi-Family Residential | Disposed of by Sale | Multifamily 327 Unit Minot Nd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,562 |  |
Real Estate | Multi-Family Residential | Disposed of by Sale | Crown - Rochester, MN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,318 |  |
Real Estate | Multi-Family Residential | Disposed of by Sale | Northern Valley - Rochester, MN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 690 |  |
Real Estate | Multi-Family Residential | Disposed of by Sale | Pinecone Villas Sartell Mn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,732 |
Real Estate | Other | Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  | 15,405 |  | 312,104 | 5,981 |
Real Estate | Other | Disposed of by Sale | Minot Southgate Retail - Minot, ND |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  | 2,056 |  | 3,332 |  |
Real Estate | Other | Disposed of by Sale | Fresenius - Duluth, MN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  | 1,078 |  |  |  |
Real Estate | Other | Disposed of by Sale | Minot 2505 16th Street SW - Minot, ND |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  | 1,814 |  |  |  |
Real Estate | Other | Disposed of by Sale | 81594 Sq Ft Minot Arrowhead - Minot, ND |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  | 5,907 |  |  |  |
Real Estate | Other | Disposed of by Sale | Bloomington 2000 W 94th Street - Bloomington, MN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  | 4,550 |  |  |  |
Real Estate | Other | Disposed of by Sale | Lexington Commerce Center Eagan Mn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,963 |  |
Real Estate | Other | Disposed of by Sale | Eagan 1440 Duckwood Medical - Eagan, MN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,886 |  |
Real Estate | Other | Disposed of by Sale | Edgewood Vista Hermantown Mn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,697 |  |
Real Estate | Other | Disposed of by Sale | Urbandale - Urbandale IA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,857 |  |
Real Estate | Other | Disposed of by Sale | Long Lake Road - Roseville MN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,766 |  |
Real Estate | Other | Disposed of by Sale | Healthcare Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 232,778 |  |
Real Estate | Other | Disposed of by Sale | Garden View - St. Paul MN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,191 |  |
Real Estate | Other | Disposed of by Sale | Ritchie Medical - St. Paul MN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,419 |  |
Real Estate | Other | Disposed of by Sale | Bismarck 715 East Broadway - Bismarck, ND |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,215 |  |
Real Estate | Other | Disposed of by Sale | Stone Container Fargo Nd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,418 |
Real Estate | Other | Disposed of by Sale | Grand Forks Carmike Grand Forks Nd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,563 |
Real Estate | Unimproved Land | Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  | 5,198 |  |  |  |
Real Estate | Unimproved Land | Disposed of by Sale | Grand Forks Grand Forks Nd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  | 2,986 |  |  |  |
Real Estate | Unimproved Land | Disposed of by Sale | Renaissance Heights Unimproved |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  | 684 |  |  |  |
Real Estate | Unimproved Land | Disposed of by Sale | Badger Hills - Rochester, MN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  | $ 1,528 |  |  |  |
Real Estate | Unimproved Land | Disposed of by Sale | Bismarck 4916 - Bismarck, ND |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,188 |  |
Real Estate | Unimproved Land | Disposed of by Sale | Grand Chute, Wisconsin, Unimproved Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 274 |
Real Estate | Healthcare | Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 202,990 |
Real Estate | Healthcare | Disposed of by Sale | Idaho Spring Creek Senior Housing Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,397 |
Real Estate | Healthcare | Disposed of by Sale | Five Edgewood Vista Senior Housing Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,393 |
Real Estate | Healthcare | Disposed of by Sale | Wyoming Senior Housing Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,469 |
Real Estate | Healthcare | Disposed of by Sale | Nine Edgewood Vista Senior Housing Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,081 |
Real Estate | Healthcare | Disposed of by Sale | Four Edgewood Vista Senior Housing Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,511 |
Real Estate | Healthcare | Disposed of by Sale | Healtheast St John And Woodwinds Maplewood And Woodbury Mn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,777 |
Real Estate | Healthcare | Disposed of by Sale | Sartell 2000 23 Rd Street South Sartell Mn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,923 |
Real Estate | Healthcare | Disposed of by Sale | Legends At Heritage Place Sartell Mn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,439 |

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