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Investment in Real Estate (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 01, 2015 ft² project property | Jun. 30, 2016 USD ($) ft² | Jun. 30, 2015 USD ($) ft² | Jun. 30, 2016 USD ($) ft² building | Jun. 30, 2015 USD ($) ft² building | Dec. 31, 2015 ft² project property | Apr. 25, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of real estate properties acquired | building |  |  |  | 6 | 1 |  |
Area of real estate property (in square feet) | ft² |  | 820,587 | 223,679 | 820,587 | 223,679 |  |
Gains (loss) on sale of real estate |  | $ 2,163 | $ (591) | $ 8,515 | $ 22,100 |  |
Capitalized personnel costs |  | 2,300 | 1,900 | 4,600 | 2,800 |  |
Capitalized interests |  | $ 2,900 | $ 900 | $ 5,500 | $ 3,000 |  |
EOP Northern California Portfolio |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Area of real estate property (in square feet) | ft² | 8,200,000 |  |  |  |  | 8,200,000 |
EOP Northern California Portfolio | Office Building |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of real estate properties acquired | property | 26 |  |  |  |  | 26 |
EOP Northern California Portfolio | Development Parcel |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Development projects acquired | project | 2 |  |  |  |  | 2 |
Disposal group held for sale | 12655 Jefferson |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Consideration for discontinued operations |  |  |  |  |  |  | $ 80,000

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