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Investment in Real Estate - Narrative (Details)				12 Months Ended
	Dec. 18, 2020 USD ($) ft²	Jul. 30, 2020 USD ($) ft²	Jun. 30, 2020	Dec. 31, 2020 USD ($) property	Dec. 31, 2019 USD ($) property	Dec. 31, 2018 USD ($)	Dec. 24, 2020	Jun. 05, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment loss				$ 0	$ 52,201,000	$ 0
Gains on sale of real estate				$ 0	$ 47,100,000	$ 43,337,000
Number of real estate properties, held-for-sale | property				0	0
Joint Venture Sun Valley Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Joint venture, ownership percentage				50.00%			50.00%
Joint Venture, Blackstone
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Joint venture, ownership percentage				20.00%				20.00%
1918 Eighth
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acquisitions, square feet | ft²	668,109
Acquisitions, purchase price	$ 625,000,000
VIE, ownership percentage	55.00%
Hollywood Media Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area | ft²		2,200,000
Hollywood Media Portfolio | Specific Studio Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Area | ft²		1,100,000
Hollywood Media Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage sold		49.00%	49.00%
Portfolio valuation		$ 1,650,000,000
Cash proceeds		$ 808,500,000
Percentage ownership retained		51.00%

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

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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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