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Investment in Real Estate (Details) $ in Thousands			1 Months Ended	6 Months Ended
	May. 22, 2015 USD ($) ft² story	Apr. 01, 2015 USD ($) ft² project property shares	Apr. 30, 2015 USD ($) ft² project	Jun. 30, 2015 USD ($)	Mar. 06, 2015 USD ($)
Disposal Group, Not Discontinued Operations | First Financial
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Discontinued operations, sales price					$ 89,000
EOP Northern California Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Area of real estate property | ft²		8,200,000
Gross payments to acquire business		$ 1,750,000
Proceeds from issuance of new term debt		$ 1,300,000
Consideration transferred, common units | shares		63,474,791
EOP Northern California Portfolio | Office Building
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Number of real estate properties acquired | property		26
EOP Northern California Portfolio | Development Parcel
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Development projects acquired | project		2
4th & Traction
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Area of real estate property | ft²	120,937
Gross payments to acquire business	$ 49,250
Number of floors | story	3
2015 Business Acquisitions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Revenues from acquired businesses				$ 87,600
Net income from acquired businesses				$ 6,600
Downtown Los Angeles Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Area of real estate property | ft²			80,000
Gross payments to acquire business			$ 40,000
Payments for non-refundable deposits			$ 1,500
Downtown Los Angeles Property | Development Parcel
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Development projects acquired | project			2

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