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Dispositions (Details) ft² in Thousands, $ in Thousands | Mar. 01, 2018 USD ($) | Nov. 16, 2017 USD ($) ft² | Jan. 18, 2017 USD ($) ft²
--- | --- | --- | ---
Discontinued Operations: |  |  |
Proceeds from sale | $ 142,500 |  |
Cascade Mall |  |  |
Discontinued Operations: |  |  |
Property area (in square feet) | ft² |  |  | 589
Northgate Mall |  |  |
Discontinued Operations: |  |  |
Property area (in square feet) | ft² |  |  | 750
Cascade and Northgate Malls |  |  |
Discontinued Operations: |  |  |
Proceeds from sale |  |  | $ 170,000
Gain (loss) on disposal |  |  | $ 59,713
500 North Michigan Avenue |  |  |
Discontinued Operations: |  |  |
Property area (in square feet) | ft² |  | 326 |
Proceeds from sale |  | $ 86,350 |
Gain (loss) on disposal |  | $ 14,597 |

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