Revenue Recognition (Details) ft² in Thousands	1 Months Ended	2 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($) ft²	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) ft²	Sep. 30, 2022 USD ($)	Oct. 26, 2023 USD ($)	Aug. 08, 2023 ft² property	Dec. 31, 2022 USD ($)
Disaggregation of Revenue [Line Items]
Revenues			$ 198,848,000	$ 195,170,000	$ 605,896,000	$ 567,748,000
Reduction of revenue related to write-down of net assets associated with lease	$ 1,600,000
Deferred rents receivable			$ 203,561,000		$ 203,561,000				$ 184,043,000
WeWork Inc.
Disaggregation of Revenue [Line Items]
Ownership interest percentage			20.00%		20.00%
WeWork Inc.
Disaggregation of Revenue [Line Items]
Area of property | ft²			33		33			162
Number of real estate properties | property								3
WeWork Inc. | Subsequent Event
Disaggregation of Revenue [Line Items]
Deferred rents receivable							$ 1,200,000
WeWork Inc. | Atlanta Market
Disaggregation of Revenue [Line Items]
Number of real estate properties | property								2
WeWork Inc. | Charlotte Market
Disaggregation of Revenue [Line Items]
Number of real estate properties | property								1
Rental property revenues
Disaggregation of Revenue [Line Items]
Revenues			$ 198,429,000	193,455,000	$ 602,459,000	559,856,000
Variable rental revenue			52,900,000	54,700,000	174,300,000	157,700,000
Rental property revenues | SVB Financial Group
Disaggregation of Revenue [Line Items]
Revenues			2,300,000
Rental property revenues | WeWork Inc.
Disaggregation of Revenue [Line Items]
Revenues					6,500,000
Rental property revenues | WeWork Inc. | Forecast
Disaggregation of Revenue [Line Items]
Revenues		$ 902,000
Fees and other
Disaggregation of Revenue [Line Items]
Revenues			419,000	1,700,000	3,400,000	7,900,000
Fees and other | Norfolk Southern
Disaggregation of Revenue [Line Items]
Revenues			$ 0	$ 1,000,000	$ 0	$ 3,200,000