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Investment in Real Estate - Summary of Property Sold (Details)			3 Months Ended		6 Months Ended
	Mar. 21, 2017 USD ($) ft²	Feb. 14, 2017 USD ($) ft²	Jun. 30, 2017 USD ($) property	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) ft² property	Jun. 30, 2016 USD ($)	Dec. 31, 2016 property
Real Estate [Line Items]
Area of real estate property (in square feet) | ft²					199,484
Sales Price					$ 86,800,000
Gains on sale of real estate			$ 0	$ 2,163,000	$ 16,866,000	$ 8,515,000
Number of properties held for sale (in properties) | property			0		0		2
Long-lived asset impairment charges					$ 0
222 Kearny Street
Real Estate [Line Items]
Area of real estate property (in square feet) | ft²		148,797
Sales Price		$ 51,800,000
3402 Pico Boulevard
Real Estate [Line Items]
Area of real estate property (in square feet) | ft²	50,687
Sales Price	$ 35,000,000

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Area Of Real Estate Disposed

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Asset Disposition, Sales Price

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- Definition

Number of Real Estate Properties Held for Sale

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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- Definition

This element represents the amount of gain (loss) on sale of properties during the reporting period net of the applicable income taxes realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 974
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-15.(a)(1)(ii))
-URI http://asc.fasb.org/extlink&oid=6875705&loc=d3e641549-123027

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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