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Acquisitions, Dispositions and Mortgage Repayments - Joint Ventures (Details) $ in Thousands												12 Months Ended
	Aug. 30, 2022	Mar. 07, 2022 USD ($) ft² property	Dec. 29, 2021 USD ($) ft²	Dec. 10, 2021 USD ($) ft²	Oct. 21, 2021 USD ($) ft²	Jul. 27, 2021 USD ($) ft²	May 10, 2021 USD ($) ft²	Apr. 30, 2021 USD ($) ft²	Apr. 08, 2021 USD ($) ft²	Apr. 01, 2021 USD ($) ft²	Mar. 30, 2021 USD ($) ft²	Dec. 31, 2022 USD ($) a ft² property jointVenture building	Dec. 31, 2021 USD ($) ft² property	Dec. 31, 2020 USD ($)
Real Estate [Line Items]
Number of buildings | building												33
PURCHASE PRICE												$ 100,975	$ 180,487
CASH CONSIDERATION												99,173	177,994
REAL ESTATE												97,569	179,862
OTHER												$ 1,604	$ (1,868)
SQUARE FOOTAGE unaudited | ft²												214,124	514,253
NUMBER OF PROPERTIES | property												688
Equity Method Investments [Roll Forward]
Equity loss recognized during the period												$ (687)	$ (795)	$ (463)
Owner distributions												$ (1,900)	$ 0
Real Estate Properties Held In Joint Ventures Member
Real Estate [Line Items]
Joint venture ownership (percent)												48.00%
San Francisco, CA
Real Estate [Line Items]
PURCHASE PRICE		$ 67,175
CASH CONSIDERATION		66,789
REAL ESTATE		65,179
OTHER		$ 1,610
SQUARE FOOTAGE unaudited | ft²		110,865
Los Angeles, CA
Real Estate [Line Items]
PURCHASE PRICE		$ 33,800					$ 24,600		$ 31,335
CASH CONSIDERATION		32,384					24,259		30,179
REAL ESTATE		32,390					24,147		30,642
OTHER		$ (6)					$ 112		$ (463)
SQUARE FOOTAGE unaudited | ft²		103,259					73,078		57,573
Denver, CO
Real Estate [Line Items]
PURCHASE PRICE					$ 23,000						$ 14,375
CASH CONSIDERATION					22,638						14,056
REAL ESTATE					23,021						14,550
OTHER					$ (383)						$ (494)
SQUARE FOOTAGE unaudited | ft²					57,257						59,359
Colorado Springs, CO
Real Estate [Line Items]
PURCHASE PRICE						$ 9,133				$ 7,200
CASH CONSIDERATION						9,137				7,288
REAL ESTATE						9,135				7,347
OTHER						$ 2				$ (59)
SQUARE FOOTAGE unaudited | ft²						23,956				27,510
San Antonio, TX
Real Estate [Line Items]
PURCHASE PRICE				$ 42,300				$ 13,600
CASH CONSIDERATION				41,892				13,412
REAL ESTATE				42,190				13,656
OTHER				$ (298)				$ (244)
SQUARE FOOTAGE unaudited | ft²				117,597				45,000
Area of land | a												3.0
NUMBER OF PROPERTIES | property													3
Dallas, TX
Equity Method Investments [Roll Forward]
Joint venture, ownership (in percentage)	40.00%
Medical Office Building
Real Estate [Line Items]
Number of buildings | property												2	4
Medical Office Building | San Francisco, CA
Real Estate [Line Items]
NUMBER OF PROPERTIES | property		3
Medical Office Building | San Antonio, TX
Real Estate [Line Items]
PURCHASE PRICE			$ 6,094
CASH CONSIDERATION			6,218
REAL ESTATE			6,308
OTHER			$ (90)
SQUARE FOOTAGE unaudited | ft²			22,381
Medical Office Building 2 | Los Angeles, CA
Real Estate [Line Items]
NUMBER OF PROPERTIES | property		2
Medical Office Building 2 | San Antonio, TX
Real Estate [Line Items]
PURCHASE PRICE			$ 8,850
CASH CONSIDERATION			8,915
REAL ESTATE			8,866
OTHER			$ 49
SQUARE FOOTAGE unaudited | ft²			30,542
Parking Garages
Equity Method Investments [Roll Forward]
Investments in unconsolidated joint ventures, beginning of period												$ 161,900	$ 73,100
New investments during the period1												167,900	89,600
Equity loss recognized during the period												(700)	(800)
Investments in unconsolidated joint ventures, end of period												$ 327,200	$ 161,900	$ 73,100
Parking Garages | Los Angeles, CA
Equity Method Investments [Roll Forward]
Number of joint ventures | jointVenture												2
Parking Garages | Los Angeles, CA | Limited Liability Company One
Equity Method Investments [Roll Forward]
Joint venture, ownership (in percentage)												20.00%
Parking Garages | Dallas, TX | Limited Liability Company Two
Equity Method Investments [Roll Forward]
Joint venture, ownership (in percentage)												40.00%

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