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Real Estate Investments - Unconsolidated Joint Venture Acquisitions (Details) $ in Thousands			3 Months Ended		6 Months Ended
	Apr. 29, 2022 property	Mar. 07, 2022 USD ($) ft² property	Jun. 30, 2022 USD ($) ft²	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) ft² property	Jun. 30, 2021 USD ($)
Real Estate [Line Items]
Joint venture ownership (percent)			50.00%		50.00%
Equity Method Investments [Roll Forward]
Investments in unconsolidated joint ventures, beginning of period					$ 161,942
Equity loss recognized during the period			$ (307)	$ (146)	(652)	$ (220)
Net LLC investments at the end of the period			210,781		210,781
San Francisco, CA
Real Estate [Line Items]
Number of properties acquired | property		3
Los Angeles, California
Real Estate [Line Items]
Number of properties acquired | property	2
Medical office building
Real Estate [Line Items]
Purchase Price			100,975		100,975
Cash Consideration					99,173
Real Estate			97,569		97,569
Other			$ 1,604		$ 1,604
Square Footage | ft²			214,124		214,124
Medical office building | San Francisco, CA
Real Estate [Line Items]
Purchase Price		$ 67,175
Cash Consideration		66,789
Real Estate		65,179
Other		$ 1,610
Square Footage | ft²		110,865
Joint venture ownership (percent)		50.00%
Number of properties acquired | property		3
Medical office building | Los Angeles, California
Real Estate [Line Items]
Purchase Price		$ 33,800
Cash Consideration		32,384
Real Estate		32,390
Other		$ (6)
Square Footage | ft²		103,259
Joint venture ownership (percent)		50.00%
Number of properties acquired | property		2
Parking Garages
Equity Method Investments [Roll Forward]
Investments in unconsolidated joint ventures, beginning of period			$ 211,195	83,943	$ 161,942	73,137
New investments during the period			0	34,138	49,599	45,018
Equity loss recognized during the period			(307)	(146)	(652)	(220)
Owner Distributions			(107)	0	(108)	0
Net LLC investments at the end of the period			$ 210,781	$ 117,935	$ 210,781	$ 117,935
Parking Garages | Atlanta, GA
Real Estate [Line Items]
Number of limited liability companies | property					2
Parking Garages | Atlanta, GA | Limited Liability Company One
Real Estate [Line Items]
Ownership interest in LLC (percent)					55.00%
Parking Garages | Atlanta, GA | Limited Liability Company Two
Real Estate [Line Items]
Ownership interest in LLC (percent)					27.00%

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