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SUBSEQUENT EVENTS (Details) (USD $) | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 30, 2014 sqft | Apr. 30, 2013 | May 22, 2014 Subsequent Event [Member] Bismarck, North Dakota [Member] acre | Apr. 30, 2014 Subsequent Event [Member] Bismarck, North Dakota [Member] Unit | Apr. 30, 2014 Subsequent Event [Member] Golden Valley, Minnesota [Member] | Apr. 30, 2014 Subsequent Event [Member] Edina, Minnesota [Member] Unit sqft | Jun. 05, 2014 Subsequent Event [Member] Brooklyn Park, Minnesota [Member] acre | May 19, 2014 Subsequent Event [Member] Dewey Hill Business Center Edina MN [Member] Property | Jun. 02, 2014 Subsequent Event [Member] Rapid City, South Dakota [Member] Unit | Apr. 30, 2014 Subsequent Event [Member] Common Shares and Limited Partnership Units [Member] | Apr. 30, 2014 Subsequent Event [Member] Series A Preferred Stock [Member] | Apr. 30, 2014 Subsequent Event [Member] Series B Preferred Stock [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Quarterly amount per share or unit (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.1300 | $ 0.5156 | $ 0.4968
Record Date |  |  |  |  |  |  |  |  |  | Jun. 16, 2014 | Jun. 16, 2014 | Jun. 16, 2014
Payment Date |  |  |  |  |  |  |  |  |  | Jul. 01, 2014 | Jun. 30, 2014 | Jun. 30, 2014
Number of units acquired |  |  |  |  |  |  |  |  | 204 |  |  |
Purchase price of acquired property |  |  | $ 4,300,000 | $ 8,500,000 |  |  | $ 2,600,000 |  | $ 18,300,000 |  |  |
Area of land (in acres) |  |  | 35.0 |  |  |  | 10.5 |  |  |  |  |
Area of property (square feet) | 5,500,000 |  |  |  |  |  |  |  |  |  |  |
Sales Price of Property Disposed |  |  |  |  | 4,800,000 |  |  | 3,100,000 |  |  |  |
Cash paid for acquisition of property | 38,200,000 | 76,020,000 | 4,300,000 |  |  |  | 2,600,000 |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  | 12,200,000 |  |  |
Number of units |  |  |  | 68 |  |  |  |  |  |  |  |
Number of office properties sold |  |  |  |  |  |  |  | 1 |  |  |  |
Number of units pending development |  |  |  |  |  | 246 |  |  |  |  |  |
Square footage of pending development (in square feet) |  |  |  |  |  | 21,000 |  |  |  |  |  |
Cost of pending development |  |  |  |  |  | $ 69,900,000 |  |  |  |  |  |
Interest in joint venture (in hundredths) |  |  |  |  |  | 50.50% |  |  |  |  |  |

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