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SUBSEQUENT EVENTS (Details) (USD $) |  |  |  | 0 Months Ended | 12 Months Ended |  | 0 Months Ended
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Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2013 Jamestown, North Dakota [Member] acre | Apr. 30, 2013 Grand Forks Grand Forks, ND [Member] | May 15, 2013 Subsequent Event [Member] | May 13, 2013 Subsequent Event [Member] | Apr. 30, 2013 Subsequent Event [Member] Bloomington Business Plaza [Member] sqft | Apr. 30, 2013 Subsequent Event [Member] Brooklyn Park 7401 Boone Avenue [Member] sqft | Apr. 30, 2013 Subsequent Event [Member] Cedar Lake Business Center [Member] sqft | Apr. 30, 2013 Subsequent Event [Member] Clive 2075 NW 94th Street Clive IA [Member] sqft | Apr. 30, 2013 Subsequent Event [Member] Dixon Avenue Industrial Park [Member] sqft | Apr. 30, 2013 Subsequent Event [Member] Nicollett VII [Member] sqft | Apr. 30, 2013 Subsequent Event [Member] Pillsbury Business Center [Member] sqft | Apr. 30, 2013 Subsequent Event [Member] Jamestown, North Dakota [Member] | Apr. 30, 2013 Subsequent Event [Member] Rapid City, Kansas [Member] | Apr. 30, 2013 Subsequent Event [Member] Rapid City, South Dakota [Member] | Apr. 30, 2013 Subsequent Event [Member] Grand Forks Grand Forks, ND [Member] | Apr. 30, 2013 Subsequent Event [Member] Minot, North Dakota [Member] acre | Jul. 01, 2013 Subsequent Event [Member] Issuance of Equity [Member] | Jul. 01, 2013 Subsequent Event [Member] Series A Preferred Stock [Member] Issuance of Equity [Member] | Jul. 01, 2013 Subsequent Event [Member] Series B Preferred Stock [Member] Issuance of Equity [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions, Redeemable Preferred Shares (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 51.56 | $ 49.68
Distributions, common shares and units (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13.00 |  |
Purchase price of acquired property |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000 |  | $ 6,200,000 | $ 10,600,000 | $ 171,000 |  |  |
Acquisition paid with issuance of equity | 12,600,000 | 8,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 560,000 |  |  |  |
Area of land (in acres) |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.69 |  |  |
Area of property (square feet) |  |  |  |  |  |  | 121,669 | 322,751 | 50,400 | 42,510 | 606,006 | 118,125 | 42,929 |  |  |  |  |  |  |  |
Sales Price of Property Disposed |  |  |  |  | 2,300,000 | 19,500,000 | 4,500,000 | 12,800,000 | 2,600,000 | 2,700,000 | 14,700,000 | 7,200,000 | 1,300,000 |  |  |  |  |  |  |  |
Cash paid for acquisition of property | 135,800,000 | 97,100,000 |  |  |  |  |  |  |  |  |  |  |  |  | 2,900,000 |  |  |  |  |  |
Operating Partnership valued at issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,300,000 |  |  |  |  |  |
Number of units |  |  |  | 96 |  |  |  |  |  |  |  |  |  |  |  | 71 |  |  |  |  |
Number of properties sold |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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