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Organization (Details) $ in Millions	Apr. 01, 2015 USD ($) ft² project property shares	Sep. 30, 2017 ft² property
Business Acquisition [Line Items]
Area of real estate property (in square feet) | ft²		15,164,345
Number of real estate properties (in properties) | property		56
Office
Business Acquisition [Line Items]
Area of real estate property (in square feet) | ft²		13,914,418
Number of real estate properties (in properties) | property		53
Office | Northern California
Business Acquisition [Line Items]
Area of real estate property (in square feet) | ft²		9,600,289
Number of real estate properties (in properties) | property		29
Office | Southern California
Business Acquisition [Line Items]
Area of real estate property (in square feet) | ft²		2,817,509
Number of real estate properties (in properties) | property		16
Office | Pacific Northwest
Business Acquisition [Line Items]
Area of real estate property (in square feet) | ft²		1,496,620
Number of real estate properties (in properties) | property		8
Media and Entertainment Properties
Business Acquisition [Line Items]
Area of real estate property (in square feet) | ft²		1,249,927
Number of real estate properties (in properties) | property		3
Media and Entertainment Properties | Southern California
Business Acquisition [Line Items]
Area of real estate property (in square feet) | ft²		1,249,927
Number of real estate properties (in properties) | property		3
EOP Northern California Portfolio
Business Acquisition [Line Items]
Area of real estate property (in square feet) | ft²	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 (in properties) | property	26
EOP Northern California Portfolio | Development Parcel
Business Acquisition [Line Items]
Number of development projects acquired (in projects) | project	2

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Number of shares of equity interests issued or issuable to acquire entity.

+ References

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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Net rentable area for properties owned.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Reference 1: 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=98514028&loc=d3e3213-108585

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