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ACQUISITIONS AND DISPOSITIONS (Details) (USD $) | 3 Months Ended
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Jul. 31, 2012 | Jul. 31, 2011
Significant Acquisitions and Disposals [Line Items] |  |  |  |
Transaction costs expensed during the period | $ 73,000 |  | $ 0 |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Land | 4,320,000 |  |  |
Buildings | 47,328,000 |  |  |
Intangible assets | 752,000 |  |  |
Acquisition costs | 52,400,000 |  |  |
Dispositions [Abstract] |  |  |  |
Sales price | 955,000 |  |  |
Book value and sales cost | 1,028,000 |  |  |
Gain/(Loss) | (73,000) |  |  |
Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Number of apartment units | 4,522 |  |  |
Villa West - Topeka, KS [Member] |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |
Area of land (in acres) | 18.3 |  |  |
Cash paid for acquisition of property | 5,200,000 |  |  |
Assumed debt | 12,500,000 |  |  |
Villa West - Topeka, KS [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date acquired | May 08, 2012 |  |  |
Land | 1,590,000 |  |  |
Buildings | 15,760,000 |  |  |
Intangible assets | 300,000 |  |  |
Acquisition costs | 17,650,000 |  |  |
Number of apartment units | 308 |  |  |
Colony - Lincoln, NE [Member] |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |
Area of land (in acres) | 14.7 |  |  |
Cash paid for acquisition of property | 14,200,000 |  |  |
Noncontrolling Interest in Operating Partnerships | 3,300,000 |  |  |
Colony - Lincoln, NE [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date acquired | Jun. 04, 2012 |  |  |
Land | 1,515,000 |  |  |
Buildings | 15,731,000 |  |  |
Intangible assets | 254,000 |  |  |
Acquisition costs | 17,500,000 |  |  |
Number of apartment units | 232 |  |  |
Lakeside Village - Lincoln, NE [Member] |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |
Area of land (in acres) | 11.5 |  |  |
Cash paid for acquisition of property | 13,800,000 |  |  |
Noncontrolling Interest in Operating Partnerships | 3,500,000 |  |  |
Lakeside Village - Lincoln, NE [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date acquired | Jun. 04, 2012 |  |  |
Land | 1,215,000 |  |  |
Buildings | 15,837,000 |  |  |
Intangible assets | 198,000 |  |  |
Acquisition costs | 17,250,000 |  |  |
Number of apartment units | 208 |  |  |
Quarry Ridge II - Rochester, MN [Member] |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |
Number of buildings | 4 |  |  |
Project costs incurred to date | 17,300,000 |  |  |
Estimated cost of construction | 15,600,000 |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Project costs incurred to date | 17,300,000 |  |  |
Williston Garden Buildings 3 and 4 - Williston, ND [Member] |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |
Interest in joint venture (in hundredths) | 60.00% |  |  |
Project costs incurred to date | 19,500,000 |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Project costs incurred to date | 19,500,000 |  |  |
Georgetown Condos 5 and 6 [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Sales price | 330,000 |  |  |
Book value and sales cost | 336,000 |  |  |
Gain/(Loss) | (6,000) |  |  |
Kentwood Thomasville - Kentwood, MI [Member] | Commercial Retail [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Area of a real estate property (in square feet) | 16,080 |  |  |
Dispositions [Abstract] |  |  |  |
Sales price | 625,000 |  |  |
Book value and sales cost | 692,000 |  |  |
Gain/(Loss) | (67,000) |  |  |
Area of a real estate property (in square feet) | 16,080 |  |  |
Development Projects Placed in Service [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Land | 0 |  | 0 |
Buildings | 7,701,000 |  | 764,000 |
Intangible assets | 0 |  | 0 |
Acquisition costs | 7,701,000 |  | 764,000 |
Development Projects Placed in Service [Member] | Quarry Ridge II - Rochester, MN [Member] | Multi-Family Residential [Member] |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |
Project costs incurred to date | 16,500,000 |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date acquired | Jun. 29, 2012 | [1] |  |
Land | 0 | [1] |  |
Buildings | 3,543,000 | [1] |  |
Intangible assets | 0 | [1] |  |
Acquisition costs | 3,543,000 | [1] |  |
Number of apartment units | 159 |  |  |
Additional construction costs during the period | 13,000,000 |  |  |
Project costs incurred to date | 16,500,000 |  |  |
Development Projects Placed in Service [Member] | Williston Garden Buildings 3 and 4 - Williston, ND [Member] | Multi-Family Residential [Member] |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |
Project costs incurred to date | 16,200,000 |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date acquired | Jul. 31, 2012 | [2] |  |
Land | 0 | [2] |  |
Buildings | 4,158,000 | [2] |  |
Intangible assets | 0 | [2] |  |
Acquisition costs | 4,158,000 | [2] |  |
Number of apartment units | 73 |  |  |
Additional construction costs during the period | 12,000,000 |  |  |
Project costs incurred to date | 16,200,000 |  |  |
Development Projects Placed in Service [Member] | Jamestown Buffalo Mall - Jamestown, ND [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Acquisition costs |  |  | 764,000 | [3]
Development Projects Placed in Service [Member] | Jamestown Buffalo Mall - Jamestown, ND [Member] | Commercial Retail [Member] |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |
Project costs incurred to date |  |  | 2,200,000 |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date acquired |  |  | Jun. 15, 2011 | [3]
Land |  |  | 0 | [3]
Buildings |  |  | 764,000 | [3]
Intangible assets |  |  | 0 | [3]
Area of a real estate property (in square feet) |  |  | 19,037 |
Additional construction costs during the period |  |  | 1,400,000 |
Project costs incurred to date |  |  | $ 2,200,000 |
Dispositions [Abstract] |  |  |  |
Area of a real estate property (in square feet) |  |  | 19,037 |
[1] | (1) 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 July 31, 2012 of $16.5 million.
[2] | (2) 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 July 31, 2012 of $16.2 million.
[3] | (1) Construction project placed in service June 15, 2011. Additional costs incurred in fiscal year 2011 totaled $1.4 million, for a total project cost at July 31, 2011 of $2.2 million.

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