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ACQUISITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE AND DISPOSITIONS, PROPERTY DISPOSITIONS (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2016 ft² property | Oct. 31, 2015 ft² property | Oct. 31, 2016 USD ($) ft² | Oct. 31, 2015 USD ($) ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sale price |  |  | $ 57,550 | $ 378,860
Book value and sales cost |  |  | 42,089 | 355,127
Gain/(Loss) |  |  | $ 15,461 | $ 23,733
Healthcare [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of properties sold | property | 8 | 1 |  |
Healthcare [Member] | Idaho Spring Creek Senior Housing Properties [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Date disposed |  |  | Oct. 31, 2016 |
Sale price |  |  | $ 43,900 |
Book value and sales cost |  |  | 37,397 |
Gain/(Loss) |  |  | $ 6,503 |
Area of real estate property | ft² | 189,244 |  | 189,244 |
Other [Member] | Stone Container - Fargo, ND [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Date disposed |  |  | Jul. 25, 2016 |
Sale price |  |  | $ 13,400 |
Book value and sales cost |  |  | 4,418 |
Gain/(Loss) |  |  | $ 8,982 |
Area of real estate property | ft² | 195,075 |  | 195,075 |
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
Sale price |  |  |  | $ 7,000
Book value and sales cost |  |  |  | 7,175
Gain/(Loss) |  |  |  | $ (175)
Area of real estate property | ft² |  | 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 |  |  |  | Aug. 03, 2015
Sale price |  |  |  | $ 250,000
Book value and sales cost |  |  |  | 231,537
Gain/(Loss) |  |  |  | $ 18,463
Area of real estate property | ft² |  | 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 |  |  |  | Aug. 12, 2015
Sale price |  |  |  | $ 40,000
Book value and sales cost |  |  |  | 41,574
Gain/(Loss) |  |  |  | $ (1,574)
Area of real estate property | ft² |  | 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 |  |  |  | Sep. 30, 2015
Sale price |  |  |  | $ 78,960
Book value and sales cost |  |  |  | 71,913
Gain/(Loss) |  |  |  | $ 7,047
Area of real estate property | ft² |  | 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
Sale price |  |  |  | $ 2,900
Book value and sales cost |  |  |  | 2,928
Gain/(Loss) |  |  |  | $ (28)
Area of real estate property | ft² |  | 48,700 |  | 48,700
Office [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of properties sold | property |  | 39 |  |
Retail [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of properties sold | property |  | 15 |  |
Unimproved Land [Member] | Georgetown Square - Grand Chute, WI [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Date disposed |  |  | May 06, 2016 |
Sale price |  |  | $ 250 |
Book value and sales cost |  |  | 274 |
Gain/(Loss) |  |  | $ (24) |

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