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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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This element represents the amount of gain (loss) on sale of properties during the reporting period net of the applicable income taxes realized.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 974
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-15.(a)(1)(ii))
-URI http://asc.fasb.org/extlink&oid=6875705&loc=d3e641549-123027

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Allowance for Funds Used during Construction
-URI http://asc.fasb.org/extlink&oid=6504829

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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-Section 50
-Paragraph 1
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