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Investment in Real Estate (Details)			3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 01, 2016 USD ($) ft²	Apr. 01, 2015 ft² project property	Sep. 30, 2016 USD ($) ft²	Sep. 30, 2015 USD ($) ft²	Sep. 30, 2016 USD ($) ft² building	Sep. 30, 2015 USD ($) ft² building	Dec. 31, 2015 ft² project property	Nov. 03, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area of real estate property (in square feet) | ft²			820,587	483,862	820,587	483,862
Payments to purchase office building					$ 307,919,000	$ 1,804,596,000
Allocation of consideration paid
Number of real estate properties acquired | building					6	2
Gains on sale of real estate			$ 0	$ 8,371,000	$ 8,515,000	$ 30,471,000
Impairment charges			0	$ 0	0	0
Disposal group disposed by sale, not discontinued operations | 12655 Jefferson | Subsequent Event
Allocation of consideration paid
Consideration for discontinued operations								$ 80,000,000
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
Allocation of consideration paid
Number of real estate properties acquired | property		26					26
EOP Northern California Portfolio | Development Parcel
Allocation of consideration paid
Number of development projects acquired | project		2					2
11601 Wilshire Boulevard Office Building
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area of real estate property (in square feet) | ft²	500,475
Payments to purchase office building	$ 311,000,000
Acquiree Revenue			5,400,000		5,400,000
Acquiree net loss			$ 1,800,000		1,800,000
Allocation of consideration paid
Investment in real estate, net	300,430,000
Net asset and liabilities assumed	307,919,000
Total revenues					483,193,000	382,327,000
Net income (loss)					$ 11,608,000	$ (18,767,000)
11601 Wilshire Boulevard Office Building | Above-market leases
Allocation of consideration paid
Intangible assets	$ 167,000
Intangible assets, weighted average useful lives	6 years 2 months 21 days
11601 Wilshire Boulevard Office Building | Deferred leasing costs and lease intangible assets, net
Allocation of consideration paid
Intangible assets	$ 13,884,000
Intangible assets, weighted average useful lives	5 years 6 months 21 days
11601 Wilshire Boulevard Office Building | Below-market lease
Allocation of consideration paid
Intangible assets	$ 6,562,000
Intangible assets, weighted average useful lives	7 years 3 months 21 days

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