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Investment in Real Estate - Dispositions (Details) - Disposed of by Sale $ in Millions			12 Months Ended
	Jul. 30, 2019 USD ($) ft²	Jul. 24, 2019 USD ($) ft²	Dec. 31, 2019 USD ($) ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Area of real estate property (sqft) | ft²			1,417,930
Sales Price | $			$ 148.4
Campus Center Office
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Area of real estate property (sqft) | ft²		471,580
Sales Price | $		$ 70.3
Campus Center Land
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Area of real estate property (sqft) | ft²	946,350
Sales Price | $	$ 78.1

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Asset Disposition, Sales Price

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Area of a real estate property.

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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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