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Supplemental Cash Flow Information of the Operating Partnership - Supplemental Cash Flow (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SUPPLEMENTAL CASH FLOWS INFORMATION:
Capitalized interest	$ 75,802	$ 75,852	$ 77,666
Cash paid for interest, net of capitalized interest of $75,802, $75,852, and $77,666 as of December 31, 2021, 2020 and 2019, respectively	77,028	61,741	43,607
Cash paid for amounts included in the measurement of ground lease liabilities	6,209	5,744	5,224
NON-CASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	119,829	189,161	162,654
Tenant improvements funded directly by tenants	20,070	11,592	10,268
Assumption of accrued liabilities in connection with acquisitions (Note 3)	37,572	0	10,267
Initial measurement of operating right of use ground lease assets (Notes 3 and 18)	46,430	0	96,272
Initial measurement of operating ground lease liabilities (Notes 3 and 18)	46,430	0	98,349
NON-CASH FINANCING TRANSACTIONS:
Accrual of distributions payable to common unitholders (Notes 14 and 25)	61,850	59,431	53,219
Kilroy Realty L.P.
SUPPLEMENTAL CASH FLOWS INFORMATION:
Capitalized interest	75,802	75,852	77,666
Cash paid for interest, net of capitalized interest of $75,802, $75,852, and $77,666 as of December 31, 2021, 2020 and 2019, respectively	77,028	61,741	43,607
Cash paid for amounts included in the measurement of ground lease liabilities	6,209	5,744	5,224
NON-CASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	119,829	189,161	162,654
Tenant improvements funded directly by tenants	20,070	11,592	10,268
Assumption of accrued liabilities in connection with acquisitions (Note 3)	37,572	0	10,267
Initial measurement of operating right of use ground lease assets (Notes 3 and 18)	46,430	0	96,272
Initial measurement of operating ground lease liabilities (Notes 3 and 18)	46,430	0	98,349
NON-CASH FINANCING TRANSACTIONS:
Accrual of distributions payable to common unitholders (Notes 14 and 25)	$ 61,850	$ 59,431	$ 53,219

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