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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2023
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On January 12, 2024, the Operating Partnership issued $400.0 million aggregated principal amount of unsecured senior notes in a registered public offering. The unsecured senior notes, which are scheduled to mature on January 15, 2036, require semi-annual interest payments each January and July based on a stated interest rate of 6.250%. On January 21, 2024, John Kilroy retired as the Company’s CEO while remaining Chair of the Board of Directors through the end of his current term. On January 22, 2024, Angela Aman joined the Company as CEO and a member of the Board of Directors and was granted 101,627 Time-Based RSUs with a one-year vesting period.