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Organization - Narrative (Details) $ in Millions		6 Months Ended		12 Months Ended
	Apr. 01, 2015 USD ($) ft² project property shares	Jun. 30, 2016 ft² property building	Jun. 30, 2015 ft² building	Dec. 31, 2015 ft² project property
Business Acquisition [Line Items]
Number of real estate properties acquired | building		6	1
Area of real estate property (in square feet) | ft²		820,587	223,679
Office Properties
Business Acquisition [Line Items]
Number of real estate properties		51
Media and Entertainment Properties
Business Acquisition [Line Items]
Number of real estate properties		2
EOP Northern California Portfolio
Business Acquisition [Line Items]
Area of real estate property (in square feet) | ft²	8,200,000			8,200,000
Gross payments to acquire business | $	$ 1,750
Consideration transferred, common units (in shares) | shares	63,474,791
EOP Northern California Portfolio | Office Building
Business Acquisition [Line Items]
Number of real estate properties acquired	26			26
EOP Northern California Portfolio | Development Parcel
Business Acquisition [Line Items]
Development projects acquired | project	2			2

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585

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