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Investment in Real Estate - Real Estate Investment Property (Details)							12 Months Ended
	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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-Name Accounting Standards Codification
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