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ACQUISITIONS AND DISPOSITIONS (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Jan. 31, 2014 | Jan. 31, 2013
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Land | $ 6,068 |  | $ 20,284 |
Buildings | 28,146 |  | 51,892 |
Intangible assets | 900 |  | 813 |
Acquisition costs | 35,114 |  | 72,989 |
Results of operations from acquired properties [Abstract] |  |  |  |
Total revenue | 1,149 |  | 4,669 |
Net income | (194) |  | (116) |
Dispositions [Abstract] |  |  |  |
Sales price | 80,883 |  | 10,173 |
Book value and sales cost | 73,884 |  | 6,721 |
Gain/(Loss) | 6,999 |  | 3,452 |
Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Land | 1,447 |  | 4,715 |
Buildings | 17,635 |  | 51,892 |
Intangible assets | 518 |  | 813 |
Acquisition costs | 19,600 |  | 57,420 |
Dispositions [Abstract] |  |  |  |
Sales price | 3,510 |  | 8,850 |
Book value and sales cost | 3,738 |  | 5,272 |
Gain/(Loss) | (228) |  | 3,578 |
Commercial Office [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Sales price | 12,950 |  |  |
Book value and sales cost | 14,504 |  |  |
Gain/(Loss) | (1,554) |  |  |
Commercial Retail [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Sales price | 3,285 |  |  |
Book value and sales cost | 3,563 |  |  |
Gain/(Loss) | (278) |  |  |
Commercial Industrial [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Sales price | 61,138 |  |  |
Book value and sales cost | 52,079 |  |  |
Gain/(Loss) | 9,059 |  |  |
Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Land | 3,651 |  | 15,569 |
Buildings | 0 |  | 0 |
Intangible assets | 0 |  | 0 |
Acquisition costs | 3,651 |  | 15,569 |
Other Disposition [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Sales price |  |  | 698 |
Book value and sales cost |  |  | 757 |
Gain/(Loss) |  |  | (59) |
Alps Park - Rapid City, SD [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | May 01, 2013 |  |  |
Land | 287 |  |  |
Buildings | 5,551 |  |  |
Intangible assets | 362 |  |  |
Acquisition costs | 6,200 |  |  |
Number of apartment units | 71 |  |  |
Anoka Strip Center- Anoka, MN [Member] | Commercial Retail [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | Dec. 23, 2013 |  |  |
Sales price | 325 |  |  |
Book value and sales cost | 347 |  |  |
Gain/(Loss) | (22) |  |  |
Area of a real estate property (in square feet) | 10,625 |  |  |
API Building, Duluth, Minnesota [Member] | Commercial Industrial [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | Sep. 24, 2013 |  |  |
Sales price | 2,553 |  |  |
Book value and sales cost | 1,488 |  |  |
Gain/(Loss) | 1,065 |  |  |
Area of a real estate property (in square feet) | 35,000 |  |  |
Badger Hills - Rochester, MN [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | Dec. 14, 2012 | [1]
Land |  |  | 1,050 | [1]
Buildings |  |  | 0 | [1]
Intangible assets |  |  | 0 | [1]
Acquisition costs |  |  | 1,050 | [1]
Bloomington Business Plaza, Bloomington, Minnesota [Member] | Commercial Office [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | Sep. 12, 2013 |  |  |
Sales price | 4,500 |  |  |
Book value and sales cost | 7,339 |  |  |
Gain/(Loss) | (2,839) |  |  |
Area of a real estate property (in square feet) | 121,669 |  |  |
Bodycote Industrial Building - Eden Prairie, MN [Member] | Commercial Industrial [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | May 13, 2013 |  |  |
Sales price | 3,150 |  |  |
Book value and sales cost | 1,375 |  |  |
Gain/(Loss) | 1,775 |  |  |
Area of a real estate property (in square feet) | 41,880 |  |  |
Brooklyn Park 7401 Boone Avenue, Brooklyn Park, Minnesota [Member] | Commercial Industrial [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | Sep. 12, 2013 |  |  |
Sales price | 12,800 |  |  |
Book value and sales cost | 12,181 |  |  |
Gain/(Loss) | 619 |  |  |
Area of a real estate property (in square feet) | 322,751 |  |  |
Burnsville 2 Strip Center - Burnsville, MN [Member] | Commercial Retail [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | Jan. 08, 2014 |  |  |
Sales price | 650 |  |  |
Book value and sales cost | 796 |  |  |
Gain/(Loss) | (146) |  |  |
Area of a real estate property (in square feet) | 8,400 |  |  |
Candlelight - Fargo, ND [Member] | Multi-Family Residential [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal |  |  | Nov. 27, 2012 |
Sales price |  |  | 1,950 |
Book value and sales cost |  |  | 1,178 |
Gain/(Loss) |  |  | 772 |
Number Of Apartment Units Dispositions (in units) |  |  | 66 |
Chateau II - Minot, ND [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | May 21, 2013 |  |  |
Land | 179 |  |  |
Buildings | 0 |  |  |
Intangible assets | 0 |  |  |
Acquisition costs | 179 |  |  |
Cedar Lake Business Center, St. Louis Park, Minnesota [Member] | Commercial Industrial [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | Sep. 12, 2013 |  |  |
Sales price | 2,550 |  |  |
Book value and sales cost | 2,607 |  |  |
Gain/(Loss) | (57) |  |  |
Area of a real estate property (in square feet) | 50,400 |  |  |
Clive 2075NW 94th Street - Clive, IA [Member] | Commercial Industrial [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | Jan. 30, 2014 |  |  |
Sales price | 2,735 |  |  |
Book value and sales cost | 2,675 |  |  |
Gain/(Loss) | 60 |  |  |
Area of a real estate property (in square feet) | 42,510 |  |  |
Colony Lincoln, NE [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | Jun. 04, 2012 |
Land |  |  | 1,515 |
Buildings |  |  | 15,731 |
Intangible assets |  |  | 254 |
Acquisition costs |  |  | 17,500 |
Number of apartment units |  |  | 232 |
Commons at Southgate - Minot, ND [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | Jan. 22, 2013 | [2]
Land |  |  | 3,691 | [2]
Buildings |  |  | 0 | [2]
Intangible assets |  |  | 0 | [2]
Acquisition costs |  |  | 3,691 | [2]
Cypress Court - St. Cloud, MN [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | Aug. 10, 2012 | [3]
Land |  |  | 447 | [3]
Buildings |  |  | 0 | [3]
Intangible assets |  |  | 0 | [3]
Acquisition costs |  |  | 447 | [3]
Cypress Court Apartment Development - St. Cloud, MN [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | Aug. 10, 2012 | [4]
Land |  |  | 1,136 | [4]
Buildings |  |  | 0 | [4]
Intangible assets |  |  | 0 | [4]
Acquisition costs |  |  | 1,136 | [4]
Dixon Avenue Industrial Park, Des Moines, Iowa [Member] | Commercial Industrial [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | Oct. 31, 2013 |  |  |
Sales price | 14,675 |  |  |
Book value and sales cost | 10,328 |  |  |
Gain/(Loss) | 4,347 |  |  |
Area of a real estate property (in square feet) | 606,006 |  |  |
Eagan Community- Eagan, MN [Member] | Commercial Retail [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | May 14, 2013 |  |  |
Sales price | 2,310 |  |  |
Book value and sales cost | 2,420 |  |  |
Gain/(Loss) | (110) |  |  |
Area of a real estate property (in square feet) | 23,187 |  |  |
East Park - Sioux Falls, SD [Member] | Multi-Family Residential [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | Dec. 18, 2013 |  |  |
Sales price | 2,214 |  |  |
Book value and sales cost | 2,358 |  |  |
Gain/(Loss) | (144) |  |  |
Number Of Apartment Units Dispositions (in units) | 84 |  |  |
Fargo 1320 45th St. N - Fargo, ND [Member] | Commercial Industrial [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | May 13, 2013 |  |  |
Sales price | 4,700 |  |  |
Book value and sales cost | 4,100 |  |  |
Gain/(Loss) | 600 |  |  |
Area of a real estate property (in square feet) | 42,244 |  |  |
Heritage Place - Sartell, MN [Member] | Commercial Healthcare [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Oct. 31, 2013 |  |  |
Land | 970 |  |  |
Buildings | 10,511 |  |  |
Intangible assets | 382 |  |  |
Acquisition costs | 11,863 |  |  |
Area Of Real Estate Property Acquisitions (in square feet) | 98,174 |  |  |
Georgetown Square Condominiums 3 and 4 [Member] | Other Disposition [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal |  |  | Aug. 02, 2012 |
Sales price |  |  | 368 |
Book value and sales cost |  |  | 421 |
Gain/(Loss) |  |  | (53) |
Georgetown Square Condominiums 5 and 6 [Member] | Other Disposition [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal |  |  | Jun. 21, 2012 |
Sales price |  |  | 330 |
Book value and sales cost |  |  | 336 |
Gain/(Loss) |  |  | (6) |
Grand Forks Unimproved - Grand Forks, ND [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | Dec. 31, 2012 |
Land |  |  | 4,278 |
Buildings |  |  | 0 |
Intangible assets |  |  | 0 |
Acquisition costs |  |  | 4,278 |
Jamestown Unimproved - Jamestown, ND [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Aug. 09, 2013 |  |  |
Land | 700 |  |  |
Buildings | 0 |  |  |
Intangible assets | 0 |  |  |
Acquisition costs | 700 |  |  |
Kentwood Thomasville Kentwood, MI [Member] | Commercial Retail [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal |  |  | Jun. 20, 2012 |
Sales price |  |  | 625 |
Book value and sales cost |  |  | 692 |
Gain/(Loss) |  |  | (67) |
Area of a real estate property (in square feet) |  |  | 16,080 |
Lakeside Village Lincoln, NE [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | Jun. 04, 2012 |
Land |  |  | 1,215 |
Buildings |  |  | 15,837 |
Intangible assets |  |  | 198 |
Acquisition costs |  |  | 17,250 |
Number of apartment units |  |  | 208 |
Legends at Heritage Place - Sartell, MN [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Oct. 31, 2013 |  |  |
Land | 537 |  |  |
Buildings | 0 |  |  |
Intangible assets | 0 |  |  |
Acquisition costs | 537 |  |  |
Lighthouse - Duluth, MN [Member] | Commercial Industrial [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | Oct. 08, 2013 |  |  |
Sales price | 1,825 |  |  |
Book value and sales cost | 1,547 |  |  |
Gain/(Loss) | 278 |  |  |
Area of a real estate property (in square feet) | 59,292 |  |  |
Metal Improvement - New Brighton, MN [Member] | Commercial Industrial [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | May 13, 2013 |  |  |
Sales price | 2,350 |  |  |
Book value and sales cost | 1,949 |  |  |
Gain/(Loss) | 401 |  |  |
Area of a real estate property (in square feet) | 49,620 |  |  |
Minot Unimproved (Southgate Lot 4) - Minot, ND [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | Jan. 11, 2013 |
Land |  |  | 1,882 |
Buildings |  |  | 0 |
Intangible assets |  |  | 0 |
Acquisition costs |  |  | 1,882 |
Minnetonka 13600 County Road 62 - Minnetonka, MN [Member] | Commercial Industrial [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | Jan. 30, 2014 |  |  |
Sales price | 3,800 |  |  |
Book value and sales cost | 3,084 |  |  |
Gain/(Loss) | 716 |  |  |
Area of a real estate property (in square feet) | 69,984 |  |  |
Nicollet VII, Burnsville, Minnesota [Member] | Commercial Office [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | Sep. 12, 2013 |  |  |
Sales price | 7,290 |  |  |
Book value and sales cost | 6,001 |  |  |
Gain/(Loss) | 1,289 |  |  |
Area of a real estate property (in square feet) | 118,125 |  |  |
Pillsbury Business Center, Bloomington, Minnesota [Member] | Commercial Office [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | Sep. 12, 2013 |  |  |
Sales price | 1,160 |  |  |
Book value and sales cost | 1,164 |  |  |
Gain/(Loss) | (4) |  |  |
Area of a real estate property (in square feet) | 42,929 |  |  |
Pinecone Villas - Sartell, MN [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Oct. 31, 2013 |  |  |
Land | 584 |  |  |
Buildings | 2,191 |  |  |
Intangible assets | 25 |  |  |
Acquisition costs | 2,800 |  |  |
Number of apartment units | 24 |  |  |
Ponds at Heritage Place - Sartell, MN [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | Oct. 10, 2012 |
Land |  |  | 395 |
Buildings |  |  | 4,564 |
Intangible assets |  |  | 61 |
Acquisition costs |  |  | 5,020 |
Number of apartment units |  |  | 58 |
Prairiewood Meadows - Fargo, ND [Member] | Multi-Family Residential [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal |  |  | Sep. 27, 2012 |
Sales price |  |  | 3,450 |
Book value and sales cost |  |  | 2,846 |
Gain/(Loss) |  |  | 604 |
Number Of Apartment Units Dispositions (in units) |  |  | 85 |
RED 20 - Minneapolis, MN [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Aug. 20, 2013 | [5] |  |
Land | 1,900 | [5] |  |
Buildings | 0 | [5] |  |
Intangible assets | 0 | [5] |  |
Acquisition costs | 1,900 | [5] |  |
Roseville 2929 Long Lake Road - Roseville, MN [Member] | Commercial Industrial [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | May 13, 2013 |  |  |
Sales price | 9,275 |  |  |
Book value and sales cost | 9,998 |  |  |
Gain/(Loss) | (723) |  |  |
Area of a real estate property (in square feet) | 172,057 |  |  |
Southpoint - Grand Forks, ND [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Sep. 05, 2013 |  |  |
Land | 576 |  |  |
Buildings | 9,893 |  |  |
Intangible assets | 131 |  |  |
Acquisition costs | 10,600 |  |  |
Number of apartment units | 96 |  |  |
Spring Creek Fruitland - Fruitland, ID [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Jan. 21, 2014 |  |  |
Land | 335 |  |  |
Buildings | 0 |  |  |
Intangible assets | 0 |  |  |
Acquisition costs | 335 |  |  |
Sycamore Village - Sioux Falls, SD [Member] | Multi-Family Residential [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | Dec. 18, 2013 |  |  |
Sales price | 1,296 |  |  |
Book value and sales cost | 1,380 |  |  |
Gain/(Loss) | (84) |  |  |
Number Of Apartment Units Dispositions (in units) | 48 |  |  |
Terrace on the Green - Fargo, ND [Member] | Multi-Family Residential [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal |  |  | Sep. 27, 2012 |
Sales price |  |  | 3,450 |
Book value and sales cost |  |  | 1,248 |
Gain/(Loss) |  |  | 2,202 |
Number Of Apartment Units Dispositions (in units) |  |  | 116 |
The Landing at Southgate, Minot, ND [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | Jan. 22, 2013 | [2]
Land |  |  | 2,262 | [2]
Buildings |  |  | 0 | [2]
Intangible assets |  |  | 0 | [2]
Acquisition costs |  |  | 2,262 | [2]
Villa West Topeka, KS [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | May 08, 2012 |
Land |  |  | 1,590 |
Buildings |  |  | 15,760 |
Intangible assets |  |  | 300 |
Acquisition costs |  |  | 17,650 |
Number of apartment units |  |  | 308 |
University Commons - Williston, ND [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | Aug. 01, 2012 |
Land |  |  | 823 |
Buildings |  |  | 0 |
Intangible assets |  |  | 0 |
Acquisition costs |  |  | 823 |
Winsted Industrial Building - Winsted, MN [Member] | Commercial Industrial [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Date Disposal | Jan. 17, 2014 |  |  |
Sales price | 725 |  |  |
Book value and sales cost | 747 |  |  |
Gain/(Loss) | (22) |  |  |
Area of a real estate property (in square feet) | 41,685 |  |  |
Development Projects Placed in Service [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Land | 0 |  | 0 |
Buildings | 31,348 |  | 22,178 |
Intangible assets | 0 |  | 0 |
Acquisition costs | 31,348 |  | 22,178 |
Development Projects Placed in Service [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Land |  |  | 0 |
Buildings |  |  | 11,649 |
Intangible assets |  |  | 0 |
Acquisition costs |  |  | 11,649 |
Development Projects Placed in Service [Member] | Commercial Healthcare [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Land |  |  | 0 |
Buildings |  |  | 6,576 |
Intangible assets |  |  | 0 |
Acquisition costs |  |  | 6,576 |
Development Projects Placed in Service [Member] | Cypress Court - St. Cloud, MN [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Nov. 01, 2013 | [6] |  |
Land | 0 | [6] |  |
Buildings | 7,836 | [6] |  |
Intangible assets | 0 | [6] |  |
Acquisition costs | 7,836 | [6] |  |
Number of apartment units | 132 | [6] |  |
Development Projects Placed in Service [Member] | Quarry Ridge II Rochester, MN [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | Jun. 29, 2012 | [7]
Land |  |  | 0 | [7]
Buildings |  |  | 4,591 | [7]
Intangible assets |  |  | 0 | [7]
Acquisition costs |  |  | 4,591 | [7]
Number of apartment units |  |  | 159 | [7]
Development Projects Placed in Service [Member] | Jamestown Medical Office Building - Jamestown, ND [Member] | Commercial Healthcare [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | Jan. 01, 2013 | [8]
Land |  |  | 0 | [8]
Buildings |  |  | 4,901 | [8]
Intangible assets |  |  | 0 | [8]
Acquisition costs |  |  | 4,901 | [8]
Area Of Real Estate Property Acquisitions (in square feet) |  |  | 45,222 | [8]
Development Projects Placed in Service [Member] | Minot IPS - Minot, ND [Member] | Commercial Industrial [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | Dec. 17, 2012 | [9]
Land |  |  | 0 | [9]
Buildings |  |  | 3,953 | [9]
Intangible assets |  |  | 0 | [9]
Acquisition costs |  |  | 3,953 | [9]
Area Of Real Estate Property Acquisitions (in square feet) |  |  | 27,567 | [9]
Development Projects Placed in Service [Member] | River Ridge - Bismarck, ND [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Dec. 02, 2013 | [10] |  |
Land | 0 | [10] |  |
Buildings | 14,703 | [10] |  |
Intangible assets | 0 | [10] |  |
Acquisition costs | 14,703 | [10] |  |
Number of apartment units | 146 | [10] |  |
Development Projects Placed in Service [Member] | Spring Wind Expansion - Laramie, WY [Member] | Commercial Healthcare [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | Nov. 16, 2012 | [11]
Land |  |  | 0 | [11]
Buildings |  |  | 1,675 | [11]
Intangible assets |  |  | 0 | [11]
Acquisition costs |  |  | 1,675 | [11]
Area Of Real Estate Property Acquisitions (in square feet) |  |  | 26,662 | [11]
Development Projects Placed in Service [Member] | The Landing at Southgate, Minot, ND [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Sep. 04, 2013 | [12] |  |
Land | 0 | [12] |  |
Buildings | 8,809 | [12] |  |
Intangible assets | 0 | [12] |  |
Acquisition costs | 8,809 | [12] |  |
Number of apartment units | 108 | [12] |  |
Development Projects Placed in Service [Member] | Williston Garden Buildings 3 and 4 Williston, ND [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition |  |  | Jul. 31, 2012 | [13]
Land |  |  | 0 | [13]
Buildings |  |  | 7,058 | [13]
Intangible assets |  |  | 0 | [13]
Acquisition costs |  |  | $ 7,058 | [13]
Number of apartment units |  |  | 73 | [13]
[1] | Acquisition of unimproved land consisted of two parcels acquired separately on December 14 and December 20, 2012, respectively.
[2] | Land is owned by a joint venture entity in which the Company has an approximately 51% interest.
[3] | Land was contributed to a joint venture entity in which the Company has an approximately 86% interest, as of January 31, 2014.
[4] | Land is owned by a joint venture in which the Company has an approximately 86% interest, as of January 31, 2014.
[5] | Land is owned by a joint venture in which the Company has an approximately 58.6% interest. The joint venture is consolidated in IRET's financial statements.
[6] | Development property placed in service November 1, 2013. Additional costs paid in fiscal year 2013 totaled $5.8 million, for a total project cost at January 31, 2014 of $13.6 million. The project is owned by a joint venture entity in which the Company has an approximately 86% interest.
[7] | Development property placed in service June 29, 2012. Additional costs paid in fiscal years 2012 and 2011, and land acquired in fiscal year 2007, totaled $13.0 million, for a total project cost at January 31, 2013 of $17.6 million.
[8] | Development property placed in service January 1, 2013. Additional costs paid in fiscal year 2012 totaled $1.0 million, for a total project cost at January 31, 2013 of $5.9 million.
[9] | Development property placed in service December 17, 2012. Additional costs paid in fiscal year 2012 totaled $1.8 million, for a total project cost at January 31, 2013 of $5.8 million.
[10] | Development property placed in service December 2, 2013. Additional costs paid in fiscal year 2013 totaled $10.1 million, including land acquired in fiscal year 2009, for a total project cost at January 31, 2014 of $24.8 million.
[11] | Expansion project placed in service November 16, 2012. Additional costs paid in fiscal year 2012 totaled $1.8 million, for a total project cost at January 31, 2013 of $3.5 million.
[12] | Development property placed in service September 4, 2013. Additional costs paid in fiscal year 2013 totaled $6.3 million, for a total project cost at January 31, 2014 of $15.1 million. The project is owned by a joint venture entity in which the Company has an approximately 51% interest.
[13] | Development property placed in service July 31, 2012. Buildings 1 and 2 were placed in service in fiscal year 2012. Additional costs paid in fiscal year 2012 totaled $12.0 million, for a total project cost at January 31, 2013 of $19.1 million.

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