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ACQUISITIONS, DEVELOPMENTS PLACED IN SERVICE AND DISPOSITIONS, Property Dispositions (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jan. 29, 2016 USD ($) Property | Jan. 31, 2016 USD ($) ft² Property | Jan. 31, 2015 USD ($) ft² Property Unit | Jan. 31, 2016 ft² Property | Jan. 31, 2016 USD ($) ft² | Jan. 31, 2015 USD ($) ft² Unit
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Sales Price |  |  | $ 3,500 | $ 10,000 |  | $ 504,914 | $ 27,619
Book Value and Sales Cost |  |  |  |  |  | 442,932 | 28,412
Gain/(Loss) |  |  |  |  |  | $ 61,982 | $ (793)
Office Properties [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of properties sold | Property |  |  |  | 1 | 48 |  |
Number of properties transferred | Property |  | 9 |  |  |  |  |
Estimated fair value of properties transferred |  | $ 89,300 |  |  |  |  |
Retail Properties [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of properties sold | Property |  |  | 3 | 1 | 17 |  |
Multifamily [Member] | 83 unit - Lancaster - St. Cloud, MN [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Date Disposed |  |  |  |  |  |  | Sep. 22, 2014
Sales Price |  |  |  |  |  |  | $ 4,451
Book Value and Sales Cost |  |  |  |  |  |  | 3,033
Gain/(Loss) |  |  |  |  |  |  | $ 1,418
Units | Unit |  |  |  | 83 |  |  | 83
Industrial [Member] | 198,600 sq ft Eagan 2785 & 2795 - Eagan, MN [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Date Disposed |  |  |  |  |  |  | Jul. 15, 2014
Sales Price |  |  |  |  |  |  | $ 3,600
Book Value and Sales Cost |  |  |  |  |  |  | 5,393
Gain/(Loss) |  |  |  |  |  |  | $ (1,793)
Area of real estate property | ft² |  |  |  | 198,600 |  |  | 198,600
Other [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  | $ 18,898
Book Value and Sales Cost |  |  |  |  |  |  | 19,316
Gain/(Loss) |  |  |  |  |  |  | $ (418)
Other [Member] | 117,144 sq ft Thresher Square - Minneapolis, MN [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Date Disposed |  |  |  |  |  | May 18, 2015 |
Sales Price |  |  |  |  |  | $ 7,000 |
Book Value and Sales Cost |  |  |  |  |  | 7,175 |
Gain/(Loss) |  |  |  |  |  | $ (175) |
Area of real estate property | ft² |  |  | 117,144 |  | 117,144 | 117,144 |
Other [Member] | 2,549,222 sq ft Office Sale Portfolio [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Date Disposed | [1] |  |  |  |  | Aug. 03, 2015 |
Sales Price | [1] |  |  |  |  | $ 250,000 |
Book Value and Sales Cost | [1] |  |  |  |  | 231,537 |
Gain/(Loss) | [1] |  |  |  |  | $ 18,463 |
Area of real estate property | ft² | [1] |  | 2,549,222 |  | 2,549,222 | 2,549,222 |
Other [Member] | 420,216 sq ft Mendota Office Center Portfolio - Mendota Heights, MN [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Date Disposed | [2] |  |  |  |  | Aug. 12, 2015 |
Sales Price | [2] |  |  |  |  | $ 40,000 |
Book Value and Sales Cost | [2] |  |  |  |  | 41,574 |
Gain/(Loss) | [2] |  |  |  |  | $ (1,574) |
Area of real estate property | ft² | [2] |  | 420,216 |  | 420,216 | 420,216 |
Other [Member] | 1,027,208 sq ft Retail Sale Portfolio [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Date Disposed | [3] |  |  |  |  | Sep. 30, 2015 |
Sales Price | [3] |  |  |  |  | $ 78,960 |
Book Value and Sales Cost | [3] |  |  |  |  | 71,913 |
Gain/(Loss) | [3] |  |  |  |  | $ 7,047 |
Area of real estate property | ft² | [3] |  | 1,027,208 |  | 1,027,208 | 1,027,208 |
Other [Member] | 48,700 sq ft Eden Prairie 6101 Blue Circle Drive - Eden Prairie, MN [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Date Disposed |  |  |  |  |  | Oct. 19, 2015 |
Sales Price |  |  |  |  |  | $ 2,900 |
Book Value and Sales Cost |  |  |  |  |  | 2,928 |
Gain/(Loss) |  |  |  |  |  | $ (28) |
Area of real estate property | ft² |  |  | 48,700 |  | 48,700 | 48,700 |
Other [Member] | 8,526 sq ft Burnsville I Strip Center - Burnsville, MN [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Date Disposed |  |  |  |  |  | Dec. 23, 2015 |
Sales Price |  |  |  |  |  | $ 1,300 |
Book Value and Sales Cost |  |  |  |  |  | 913 |
Gain/(Loss) |  |  |  |  |  | $ 387 |
Area of real estate property | ft² |  |  | 8,526 |  | 8,526 | 8,526 |
Other [Member] | 4,800 sq ft Pine City C-Store - Pine City, MN [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Date Disposed |  |  |  |  |  | Jan. 08, 2016 |
Sales Price |  |  |  |  |  | $ 300 |
Book Value and Sales Cost |  |  |  |  |  | 355 |
Gain/(Loss) |  |  |  |  |  | $ (55) |
Area of real estate property | ft² |  |  | 4,800 |  | 4,800 | 4,800 |
Other [Member] | 11,003 sq ft Minot Plaza - Minot, ND [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Date Disposed |  |  |  |  |  | Jan. 19, 2016 |
Sales Price |  |  |  |  |  | $ 1,854 |
Book Value and Sales Cost |  |  |  |  |  | 393 |
Gain/(Loss) |  |  |  |  |  | $ 1,461 |
Area of real estate property | ft² |  |  | 11,003 |  | 11,003 | 11,003 |
Other [Member] | 937,518 sq ft 9-Building Office Portfolio [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Date Disposed | [4],[5] |  |  |  |  | Jan. 29, 2016 |
Sales Price | [4] |  |  |  |  | $ 122,600 |
Book Value and Sales Cost | [4] |  |  |  |  | 86,144 |
Gain/(Loss) | [4] |  |  |  |  | $ 36,456 |
Area of real estate property | ft² | [4],[5] |  | 937,518 |  | 937,518 | 937,518 |
Other [Member] | 73,338 sq ft Dewey Hill - Edina, MN [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Date Disposed |  |  |  |  |  |  | May 19, 2014
Sales Price |  |  |  |  |  |  | $ 3,100
Book Value and Sales Cost |  |  |  |  |  |  | 3,124
Gain/(Loss) |  |  |  |  |  |  | $ (24)
Area of real estate property | ft² |  |  |  | 73,338 |  |  | 73,338
Other [Member] | 25,644 sq ft Weston Retail - Weston, WI [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Date Disposed |  |  |  |  |  |  | Jul. 28, 2014
Book Value and Sales Cost |  |  |  |  |  |  | $ 1,176
Gain/(Loss) |  |  |  |  |  |  | $ (1,176)
Area of real estate property | ft² |  |  |  | 25,644 |  |  | 25,644
Other [Member] | 74,568 sq ft Wirth Corporate Center - Golden Valley, MN [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Date Disposed |  |  |  |  |  |  | Aug. 29, 2014
Sales Price |  |  |  |  |  |  | $ 4,525
Book Value and Sales Cost |  |  |  |  |  |  | 4,695
Gain/(Loss) |  |  |  |  |  |  | $ (170)
Area of real estate property | ft² |  |  |  | 74,568 |  |  | 74,568
Other [Member] | 52,000 sq ft Kalispell Retail - Kalispell, MT [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Date Disposed |  |  |  |  |  |  | Oct. 15, 2014
Sales Price |  |  |  |  |  |  | $ 1,230
Book Value and Sales Cost |  |  |  |  |  |  | 1,229
Gain/(Loss) |  |  |  |  |  |  | $ 1
Area of real estate property | ft² |  |  |  | 52,000 |  |  | 52,000
Other [Member] | 34,226 sq ft Fargo Express Center & SC Pad - Fargo, ND [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Date Disposed |  |  |  |  |  |  | Nov. 18, 2014
Sales Price |  |  |  |  |  |  | $ 2,843
Book Value and Sales Cost |  |  |  |  |  |  | 2,211
Gain/(Loss) |  |  |  |  |  |  | $ 632
Area of real estate property | ft² |  |  |  | 34,226 |  |  | 34,226
Other [Member] | 79,297 sq ft Northgate I - Maple Grove, MN [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Date Disposed |  |  |  |  |  |  | Dec. 01, 2014
Sales Price |  |  |  |  |  |  | $ 7,200
Book Value and Sales Cost |  |  |  |  |  |  | 6,881
Gain/(Loss) |  |  |  |  |  |  | $ 319
Area of real estate property | ft² |  |  |  | 79,297 |  |  | 79,297
Unimproved Land [Member] | Kalispell Unimproved - Kalispell, MT [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Date Disposed |  |  |  |  |  |  | Oct. 15, 2014
Sales Price |  |  |  |  |  |  | $ 670
Book Value and Sales Cost |  |  |  |  |  |  | 670
Gain/(Loss) |  |  |  |  |  |  | $ 0
[1] | The properties included in this portfolio disposition are: 610 Business Center, 7800 West Brown Deer Road, Ameritrade, Barry Pointe Office Park, Benton Business Park, Brenwood, Brook Valley I, Crosstown Centre, Golden Hills Office Center, Granite Corporate Center, Great Plains, Highlands Ranch I, Highlands Ranch II, Interlachen Corporate Center, Intertech Building, Minnesota National Bank, Northpark Corporate Center, Omaha 10802 Farnam Dr, Plaza VII, Plymouth 5095 Nathan Lane, Prairie Oak Business Center, Rapid City 900 Concourse Drive, Spring Valley IV, Spring Valley V, Spring Valley X, Spring Valley XI, Superior Office Building, TCA Building, Three Paramount Plaza, UHC Office, US Bank Financial Center, Wells Fargo Center, West River Business Park and Westgate.
[2] | The properties included in this portfolio disposition are: Mendota Office Center I, Mendota Office Center II, Mendota Office Center III, Mendota Office Center IV and American Corporate Center.
[3] | The properties included in this portfolio disposition are: Champlin South Pond, Chan West Village, Duluth 4615 Grand, Duluth Denfeld Retail, Forest Lake Auto, Forest Lake Westlake Center, Grand Forks Medpark Mall, Jamestown Buffalo Mall, Jamestown Business Center, Lakeville Strip Center, Monticello C Store & vacant land, Omaha Barnes & Noble, Pine City Evergreen Square, Rochester Maplewood Square and St. Cloud Westgate.
[4] | On January 29, 2016, we transferred ownership of nine properties to the mortgage lender on a $122.6 million non-recourse loan and removed the debt obligation and accrued interest from our balance sheet. The properties had an estimated fair value of $89.3 million on the transfer date. Upon completion of this transfer, we recognized a gain on extinguishment of debt of $36.5 million, representing the difference between the loan and accrued interest payable extinguished over the carrying value of the properties, cash, accounts payable and accounts receivable transferred as of the transfer date and related closing costs.
[5] | The properties included in this portfolio disposition are: Corporate Center West, Farnam Executive Center, Flagship Corporate Center, Gateway Corporate Center, Miracle Hills One, Pacific Hills, Riverport, Timberlands, and Woodlands Plaza IV.

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