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Organization (Details) $ in Millions	Apr. 01, 2015 USD ($) ft² project property shares	Dec. 31, 2017 ft² property
Business Acquisition [Line Items]
Net rentable area (in square feet) | ft²		14,541,458
Number of Properties | property		54
Office
Business Acquisition [Line Items]
Net rentable area (in square feet) | ft²		13,291,531
Number of Properties | property		51
Media & Entertainment
Business Acquisition [Line Items]
Net rentable area (in square feet) | ft²		1,249,927
Number of Properties | property		3
EOP Northern California Portfolio
Business Acquisition [Line Items]
Net rentable area (in square feet) | ft²	8,200,000
Payments to acquire businesses | $	$ 1,750
Shares issued as consideration for business combination | shares	63,474,791
EOP Northern California Portfolio | Office Building
Business Acquisition [Line Items]
Number of real estate properties acquired | property	26
EOP Northern California Portfolio | Development Parcel
Business Acquisition [Line Items]
Number of real estate development projects acquired | 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 number of real estate properties owned as of the balance sheet date.

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

+ References

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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