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COMMITMENTS AND CONTINGENCIES (Details) (USD $) | 3 Months Ended |  | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |
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Jul. 31, 2014 Unit Property sqft | Jul. 31, 2013 | Jul. 31, 2014 Commons at Southgate, Minot, North Dakota [Member] Unit | Jul. 31, 2014 Bismarck, North Dakota [Member] Property One [Member] Unit | Jul. 31, 2014 Bismarck, North Dakota [Member] Property Two [Member] Unit | Jul. 31, 2014 Cardinal Point, Grand Forks, North Dakota [Member] Unit | Jul. 31, 2014 Cypress Court - St. Cloud, MN [Member] Unit | Jul. 31, 2014 Grand Forks, ND [Member] Unit | Jul. 31, 2014 Arcata Apartments, Golden Valley, Minnesota [Member] Unit | Jul. 31, 2014 Chateau II, Minot, North Dakota [Member] Unit | Apr. 30, 2014 Chateau II, Minot, North Dakota [Member] | Apr. 30, 2014 Fargo, ND [Member] | Apr. 30, 2014 St. Cloud, MN [Member] | Jul. 31, 2014 Deer Ridge - Jamestown, ND [Member] Unit | Jul. 31, 2014 RED 20 - Minneapolis, MN [Member] sqft Unit | Apr. 30, 2014 Maple Grove, MN [Member] | Jul. 31, 2014 71 France Phase I - Edina, MN [Member] Unit | Jul. 31, 2014 71 France Phase I - Edina, MN [Member] Footnote (7) [Member] | Jul. 31, 2014 PrairieCare Medical - Brooklyn Park, MN [Member] sqft | Jul. 31, 2014 Renaissance Heights I Apartments, Williston, North Dakota [Member] Unit | Jul. 31, 2014 Renaissance Heights I Apartments, Williston, North Dakota [Member] Project Phase One [Member] | Jul. 31, 2014 Edina 6565 France SMC III - Edina, MN [Member] sqft | Jul. 31, 2014 Minot Wells Fargo Bank - Minot, ND [Member] sqft | Jul. 31, 2014 Roseville 3075 Long Lake Rd - Roseville, MN [Member] sqft | Jul. 31, 2014 Vacant land in Monticello, MN [Member] sqft | Jul. 31, 2014 Other [Member]
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties subject to purchase options | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total property cost subject to purchase options | $ 120,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total gross rental revenue from properties subject to purchase options | 2,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties subject to restrictions on taxable dispositions | 110 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of a real estate property | 5,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,625 | [1] |  |  |  |  |  | 75,000 |  |  |  |  |  | 72,012 |  | 4,998 |  | 202,807 |  | 12,700,000 |  |
Number of apartment units placed in service | 5,106 |  |  |  |  | 68 | 119 |  |  |  |  | 74 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate investment amount of properties (net of accumulated depreciation) | 827,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption basis | one-for-one |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period to hold the beneficial interest, minimum | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of consecutive trading days for valuation | 10 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate redemption value of UPREIT Units of operating partnership owned by limited partners | 154,400,000 |  | 197,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint ventures partner's interest acquired | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tenant Improvements | 8,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment period for tenant improvements | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of apartment units |  |  |  | 233 | [2] |  |  | 251 |  | 66 | [3] |  | 165 |  | 72 | [4] |  |  |  |  | 163 |  | 130 | [1] |  | 109 |  |  |  |  |  | 288 | [5] |  |  |  |  |  |  |  |  |  |  |
Anticipated Total Cost | 354,552,000 |  |  | 37,201,000 | [2] |  |  | 40,042,000 |  | 7,028,000 | [3] |  | 33,448,000 |  | 14,711,000 | [4] |  |  |  |  | 24,519,000 |  | 29,462,000 | [1] |  | 29,660,000 |  | 69,900,000 | [6] | 24,251,000 |  | 62,362,000 | [5] |  |  | 34,665,000 |  | 3,288,000 |  | 13,915,000 |  |  |  |
Project costs incurred to date | 153,964,000 | [7] |  | 33,218,000 | [2],[7] |  |  | 9,333,000 | [7] | 3,168,000 | [3],[7] |  | 19,048,000 | [7] | 5,681,000 | [4],[7] |  |  |  |  | 1,793,000 | [7] | 20,399,000 | [1],[7] |  | 4,255,000 | [7] |  |  | 4,486,000 | [7] | 44,251,000 | [5],[7] | 23,000,000 | [5] | 4,204,000 | [7] | 1,550,000 | [7] | 2,578,000 | [7] |  | 874,000 | [7]
Estimated quarter for completion | 189,193,000 |  |  | 24,480,000 | [2] |  |  | 24,500,000 |  | 4,200,000 | [3] |  | 24,250,000 |  | 0 | [4] |  |  |  |  | 0 |  | 21,726,000 | [1] |  | 20,365,000 |  |  |  | 15,000,000 |  | 43,672,000 | [5] |  |  | 0 |  | 0 |  | 11,000,000 |  |  |  |
Estimated year for completion |  |  |  | FY2015 Q2 | [2] |  |  | FY2016 Q1 |  | FY2015 Q3 | [3] |  | FY2015 Q3 |  | FY2016 Q1 | [4] |  |  |  |  | FY2016 Q2 |  | FY2015 Q3 | [1] |  | FY2016 Q1 |  |  |  | FY2016 Q2 |  | FY2015 Q4 | [5] |  |  | FY2016 Q2 |  | FY2015 Q2 |  | FY2015 Q4 |  |  |  |
Interest in joint venture (in hundredths) |  |  |  | 52.90% | [2] |  |  |  |  | 86.10% | [3] |  |  |  |  |  |  |  |  |  |  |  | 58.60% | [1] |  | 55.30% |  | 51.00% | [6] |  |  | 70.00% | [5] |  |  |  |  |  |  |  |  |  |  |
Insurance proceeds receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 | [4] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Construction interest capitalized | 1,000,000 |  | 580,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase Price of Pending Acquisition |  |  |  |  |  | 8,500,000 | 15,000,000 |  |  |  |  | 9,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 |  |
Value of limited partnership units |  |  |  |  |  | 100,000 | 700,000 |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price of pending disposition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,800,000 | 4,500,000 |  |  |  |  | 7,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition |  |  |  |  |  | $ 8,400,000 | $ 14,300,000 |  |  |  |  | $ 8,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,700,000 |  |
[1] | The Company is an approximately 58.6% partner in the joint venture entity constructing this project; the anticipated total cost amount given is the total cost to the joint venture entity.
[2] | The Company is an approximately 52.9% partner in the joint venture entity constructing this project; the anticipated total cost amount given is the total cost to the joint venture entity.
[3] | The Company is an approximately 86.1% partner in the joint venture entity constructing this project; the anticipated total cost amount given is the total cost to the joint venture entity.
[4] | On December 5, 2013, this development project was destroyed by fire. As of July 31, 2014, $4.0 million of expected insurance proceeds were included in accounts receivable on the Company’s consolidated balance sheet. See Note 2 for additional information.
[5] | The Company is an approximately 70% partner in the joint venture entity constructing this project; the anticipated total cost amount given is the total cost to the joint venture entity.
[6] | The Company is currently an approximately 55.3% partner in the joint venture entity constructing this project. The project will be constructed in three phases, and at the conclusion of construction of the third phase, the Company will have an approximately 50.5% interest in the project. The anticipated total cost amount given in the table above is the total cost to the joint venture entity of the project’s first phase. The expected total project cost for all three phases is approximately $69.9 million for a total of approximately 241 residential units and approximately 21,772 square feet of commercial retail space.
[7] | Includes costs related to development projects that are placed in service in phases (Renaissance Heights I - $23.0 million).

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