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Summary of Significant Accounting Policies - Narrative (Details)		12 Months Ended
	Aug. 19, 2014 USD ($)	Dec. 31, 2016 USD ($) segment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jul. 01, 2016 USD ($)	Jun. 16, 2016 USD ($)
Accounting Policies [Line Items]
Construction costs capitalization period after substantially complete		1 year
Capitalized personnel costs		$ 9,347,000	$ 7,349,000	$ 3,061,000
Capitalized interest		11,307,000	6,516,000	6,938,000
Loss from discontinued operations		0	0	$ 164,000
Notes Receivable
Notes receivable, maximum principal	$ 140,000,000.0
Notes receivable, share of maximum principal, percentage	23.77%
Notes receivable, share of maximum principal, amount	$ 33,300,000
Note receivable, interest rate	11.00%
Commitment fee earned	$ 400,000
Notes receivable from loan acquired		$ 0	28,684,000
Number of reportable segments | segment		2
Income Taxes
Income tax expense		$ 0
Investment in unconsolidated entities		37,228,000	$ 0
11601 Wilshire
Income Taxes
Joint venture, ownership percentage					28.00%
Investment in unconsolidated entities					$ 7,836,000
Santa Clara, CA Joint Venture
Income Taxes
Joint venture, ownership percentage						21.00%
Investment in unconsolidated entities						$ 29,400,000
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-09, Forfeiture Rate Component | Pro Forma
Notes Receivable
Cumulative effect of adoption of new accounting principle		$ 700,000
Building and improvements
Accounting Policies [Line Items]
Estimated useful life		39 years
Land improvements
Accounting Policies [Line Items]
Estimated useful life		15 years
Furniture and fixtures | Minimum
Accounting Policies [Line Items]
Estimated useful life		5 years
Furniture and fixtures | Maximum
Accounting Policies [Line Items]
Estimated useful life		7 years

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