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SUBSEQUENT EVENTS (Details) $ / shares in Units, $ in Thousands |  |  |  | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 25, 2015 USD ($) Unit Parcel | Jun. 12, 2015 USD ($) Unit State | May. 18, 2015 USD ($) | Jun. 29, 2015 USD ($) ft² | Apr. 30, 2015 USD ($) | Apr. 30, 2014 USD ($) | Jun. 02, 2015 $ / shares
Subsequent Event [Line Items] |  |  |  |  |  |  |
Purchase price of acquired property |  |  |  |  | $ 56,297 | $ 43,580 |
Commitment of credit facility |  |  |  |  | 90,000 |  |
Minimum [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Commitment of credit facility |  |  |  |  | 90,000 |  |
Maximum [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Commitment of credit facility |  |  |  |  | $ 100,000 |  |
Common Shares and Limited Partnership Units [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Record Date |  |  |  |  | Jun. 15, 2015 |  |
Payment Date |  |  |  |  | Jul. 01, 2015 |  |
Series A Preferred Stock [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Record Date |  |  |  |  | Jun. 15, 2015 |  |
Payment Date |  |  |  |  | Jun. 30, 2015 |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Record Date |  |  |  |  | Jun. 15, 2015 |  |
Payment Date |  |  |  |  | Jun. 30, 2015 |  |
Multi Family Residential [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Purchase price of acquired property |  |  |  |  | $ 41,780 | $ 19,600 |
Subsequent Event [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Sales price of office properties | $ 81,500 | $ 250,000 |  |  |  |  |
Number of units | Unit | 17 | 34 |  |  |  |  |
Number of states | State |  | 8 |  |  |  |  |
Commitment of credit facility |  |  |  | $ 100,000 |  |  |
Parcel of undeveloped real estate sold | Parcel | 1 |  |  |  |  |  |
Subsequent Event [Member] | Common Shares and Limited Partnership Units [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Quarterly amount per share or unit (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.1300
Subsequent Event [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Quarterly amount per share or unit (in dollars per share) | $ / shares |  |  |  |  |  |  | 0.5156
Subsequent Event [Member] | Series B Preferred Stock [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Quarterly amount per share or unit (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.4968
Subsequent Event [Member] | Commercial Office [Member] | Omaha, Nebraska [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Square footage of pending development (in square feet) | ft² |  |  |  | 28,000 |  |  |
Purchase price of acquired property |  |  |  | $ 6,500 |  |  |
Subsequent Event [Member] | Commercial Office [Member] | Mendota Heights, Minnesota [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Sales price of office properties |  | $ 40,000 |  |  |  |  |
Number of units | Unit |  | 5 |  |  |  |  |
Interest in joint venture (in hundredths) |  | 51.00% |  |  |  |  |
Subsequent Event [Member] | Commercial Office [Member] | Minneapolis, Minnesota [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Sales price of office properties |  |  | $ 7,000 |  |  |  |

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