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Investment in Real Estate - Schedule of Dispositions (Details) $ in Millions								12 Months Ended
	Nov. 04, 2016 USD ($) ft²	Jun. 01, 2016 USD ($) ft²	Apr. 07, 2016 USD ($) ft²	Jan. 14, 2016 USD ($) ft²	Sep. 29, 2015 USD ($) ft²	Mar. 06, 2015 USD ($) ft²	Jul. 16, 2014 USD ($) ft²	Dec. 31, 2016 USD ($) ft²	Dec. 31, 2015 USD ($) ft²	Dec. 31, 2014 USD ($) ft²	Jan. 07, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area of real estate property | ft²								921,343	483,862	112,300
Sales Price | $								$ 367.4	$ 179.0	$ 19.5
Bayhill Office Center
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area of real estate property | ft²				554,328
Sales Price | $				$ 215.0
Patrick Henry Drive
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area of real estate property | ft²			70,520
Sales Price | $			$ 19.0
One Bay Plaza
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area of real estate property | ft²		195,739
Sales Price | $		$ 53.4
12655 Jefferson
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area of real estate property | ft²	100,756
Sales Price | $	$ 80.0
First Financial
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area of real estate property | ft²						223,679
Sales Price | $						$ 89.0
Bay Park Plaza
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area of real estate property | ft²					260,183
Sales Price | $					$ 90.0
Tierrasanta
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area of real estate property | ft²							112,300
Sales Price | $							$ 19.5
1455 Market
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Joint venture, ownership percentage											45.00%

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Area Of Real Estate Property, Disposed

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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