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Investment in Real Estate - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) property	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) property	Sep. 30, 2020 USD ($)
Real Estate [Abstract]
Number of properties acquired | property			0
Number of dispositions | property			0
Number of real-estate properties classified as held-for-sale | property	0		0
Real Estate
Impairment loss | $	$ 2,762,000	$ 0	$ 2,762,000	$ 0
Del Amo Office
Real Estate
Impairment loss | $			2,800,000
Investment in real estate, fair value | $	$ 17,400,000		$ 17,400,000

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Investments In Real Estate, Fair Value Disclosure

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The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230

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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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