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Supplemental Cash Flow Information of the Operating Partnership - Reconciliation of Cash and Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH:
Cash and cash equivalents	$ 618,794	$ 347,379	$ 249,981	$ 414,077
Restricted cash	0	0	13,009	13,006
Cash and cash equivalents and restricted cash	618,794	347,379	262,990	427,083
Kilroy Realty L.P.
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH:
Cash and cash equivalents	618,794	347,379	249,981	414,077
Restricted cash	0	0	13,009	13,006
Cash and cash equivalents and restricted cash	$ 618,794	$ 347,379	$ 262,990	$ 427,083

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