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Investment in Real Estate - Narrative (Details)				12 Months Ended
	Dec. 23, 2021 USD ($) ft²	Dec. 18, 2020 USD ($) ft²	Jul. 30, 2020 USD ($) ft²	Dec. 31, 2021 USD ($) ft² property	Dec. 31, 2020 USD ($) property	Dec. 31, 2019 USD ($) ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Impairment loss				$ 2,762,000	$ 0	$ 52,201,000
Gains on sale of real estate				$ 0	$ 0	$ 47,100,000
Number of properties | property				66	0
Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Area of real estate property (sqft) | ft²						1,417,930
Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Area of real estate property (sqft) | ft²				745,171
Number of properties | property				4
Hollywood Media Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
VIE, ownership percentage				51.00%
Hollywood Media Portfolio | Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
VIE, ownership percentage			49.00%
Area of land (sqft) | ft²			2,200,000
Portfolio valuation			$ 1,650,000,000
Cash proceeds			$ 808,500,000
1918 Eighth
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Acquisitions, purchase price		$ 625,000,000
Area of real estate property (sqft) | ft²		668,209
VIE, ownership percentage		55.00%
Specific Studio Properties | Hollywood Media Portfolio | Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Area of land (sqft) | ft²			1,100,000
Del Amo Office
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Impairment loss				$ 2,800,000
Investment in real estate, fair value				$ 17,400,000		$ 70,300,000
5th & Bell Office Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Acquisitions, square feet | ft²	197,136
Acquisitions, purchase price	$ 118,900,000

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Area of land held.

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Area of a real estate property.

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The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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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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The number of real estate properties owned as of the balance sheet date.

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Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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