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Investment in Real Estate - Narrative (Details)								12 Months Ended
	Jan. 14, 2016 USD ($)	Sep. 29, 2015 USD ($)	Aug. 17, 2015 USD ($) ft² floor	May. 22, 2015 USD ($) ft² floor	Apr. 01, 2015 USD ($) ft² property	Mar. 06, 2015 USD ($)	Jul. 06, 2014 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Jul. 16, 2014 USD ($)	Jul. 12, 2013 USD ($)
Business Acquisition
Total consideration								$ 3,904,977,000	$ 113,580,000
Impairment loss from discontinued operations								0	0	$ 5,580,000
Proceeds from sale of real estate								177,488,000	$ 18,629,000	$ 52,994,000
Subsequent Event | Bayhill
Business Acquisition
Proceeds from sale of real estate	$ 215,000,000
Disposal Group, Not Discontinued Operations | Bay Park Plaza
Business Acquisition
Consideration for disposal group		$ 90,000,000
Gain on sale of real estate		$ 8,400,000
Disposal Group, Not Discontinued Operations | First Financial
Business Acquisition
Consideration for disposal group						$ 89,000,000
Gain on sale of real estate						$ 22,100,000
Disposal Group, Not Discontinued Operations | Tierrasanta
Business Acquisition
Consideration for disposal group											$ 19,500,000
Gain on sale of real estate							$ 5,500,000
Discontinued Operations, Held-for-sale | City Plaza
Business Acquisition
Consideration for disposal group												$ 56,000,000
EOP Northern California Portfolio
Business Acquisition
Area of real estate property | ft²					8,200,000
Total consideration					$ 3,815,727,000
Payments to acquire businesses					1,750,000,000
Proceeds from issuance of debt					1,300,000,000
Equity consideration					$ 63,474,791
Revenue of acquiree since acquisition date								254,900,000
Pro forma, earnings since acquisition date, actual								100,000
EOP Northern California Portfolio | Office Building
Business Acquisition
Number of real estate properties | property					26
EOP Northern California Portfolio | Development Parcel
Business Acquisition
Number of real estate properties | property					2
4th & Traction
Business Acquisition
Area of real estate property | ft²				120,937
Total consideration				$ 49,250,000
Number of floors | floor				3
Pro forma, earnings since acquisition date, actual								0
405 Mateo
Business Acquisition
Area of real estate property | ft²			83,285
Total consideration			$ 40,000,000
Number of floors | floor			3
Pro forma, earnings since acquisition date, actual								$ 0

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