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Real Estate Investments - Unconsolidated Joint Venture Acquisitions (Details) $ in Thousands				3 Months Ended		9 Months Ended
	Aug. 05, 2022 property	Apr. 29, 2022 property	Mar. 07, 2022 USD ($) ft² property	Sep. 30, 2022 USD ($) ft²	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) ft² property	Sep. 30, 2021 USD ($)
Equity Method Investments [Roll Forward]
Investments in unconsolidated joint ventures, beginning of period						$ 161,942
Equity loss recognized during the period				$ (124)	$ (183)	(776)	$ (404)
Net LLC investments at the end of the period				327,752		327,752
San Francisco, CA
Real Estate [Line Items]
Number of properties acquired | property			3
Los Angeles, CA
Real Estate [Line Items]
Number of properties acquired | property	4	2
Joint venture, ownership (in percentage)	20.00%
Medical office building | Joint Venture Acquisitions
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]
Number of properties acquired | property			3
Medical office building | San Francisco, CA | Joint Venture Acquisitions
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%
Medical office building | Los Angeles, CA
Real Estate [Line Items]
Number of properties acquired | property			2
Medical office building | Los Angeles, CA | Joint Venture Acquisitions
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%
Parking Garages
Equity Method Investments [Roll Forward]
Investments in unconsolidated joint ventures, beginning of period				$ 210,781	117,935	$ 161,942	73,137
New investments during the period				117,880	4,593	167,479	49,612
Equity loss recognized during the period				(124)	(183)	(776)	(404)
Owner distributions				(785)	0	(893)	0
Net LLC investments at the end of the period				$ 327,752	$ 122,345	$ 327,752	$ 122,345
Parking Garages | Los Angeles, CA
Real Estate [Line Items]
Number of joint ventures | property						2
Parking Garages | Los Angeles, CA | Limited Liability Company One
Real Estate [Line Items]
Joint venture, ownership (in percentage)						20.00%
Parking Garages | Los Angeles, CA | Limited Liability Company Two
Real Estate [Line Items]
Joint venture, ownership (in percentage)						40.00%

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