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Investment in Real Estate - Real Estate Investment Property (Details) |  |  |  |  |  |  | 12 Months Ended
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Dec. 12, 2016 USD ($) ft² | Oct. 07, 2016 USD ($) ft² | Jul. 01, 2016 USD ($) ft² | Aug. 17, 2015 USD ($) ft² | May 22, 2015 USD ($) ft² | Apr. 01, 2015 USD ($) ft² property project | Dec. 31, 2016 USD ($) ft² | Dec. 31, 2015 USD ($) ft²
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Square Feet (unaudited) | ft² |  |  |  |  |  |  | 968,831 | 8,405,678
Purchase Price |  |  |  |  |  |  | $ 640,800,000 | $ 3,904,977,000
Hill7 office property |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Joint venture, ownership percentage |  | 55.00% |  |  |  |  |  |
Secured Debt | Hill7 office property |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 101,000,000.0 |  |  |  |  |  |
11601 Wilshire |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Square Feet (unaudited) | ft² |  |  | 500,475 |  |  |  |  |
Purchase Price |  |  | $ 311,000,000 |  |  |  |  |
Joint venture, ownership percentage |  |  | 28.00% |  |  |  |  |
Hill7 office property |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Square Feet (unaudited) | ft² |  | 285,680 |  |  |  |  |  |
Purchase Price |  | $ 179,800,000 |  |  |  |  |  |
Page Mill Hill |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Square Feet (unaudited) | ft² | 182,676 |  |  |  |  |  |  |
Purchase Price | $ 150,000,000 |  |  |  |  |  |  |
EOP Northern California Portfolio |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Square Feet (unaudited) | ft² |  |  |  |  |  | 8,201,456 |  |
Purchase Price |  |  |  |  |  | $ 3,815,700,000 |  |
EOP Northern California Portfolio | Office Building |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of Buildings (unaudited) | property |  |  |  |  |  | 26 |  |
EOP Northern California Portfolio | Development Parcel |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of real estate development projects acquired | project |  |  |  |  |  | 2 |  |
4th and Traction |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Square Feet (unaudited) | ft² |  |  |  |  | 120,937 |  |  |
Purchase Price |  |  |  |  | $ 49,250,000 |  |  |
405 Mateo |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Square Feet (unaudited) | ft² |  |  |  | 83,285 |  |  |  |
Purchase Price |  |  |  | $ 40,000,000 |  |  |  |

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