Derivative Instruments and Hedging Activities (Details) - Interest Rate Swap - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Derivative, Notional Amount	$ 2,100,000
Fair Value Hedge Assets	$ 12,298	$ 1,976
325 Main Street, 355 Main Street, 90 Broadway and Kendall Center Green Garage Properties [Member]
Derivative [Line Items]
Derivative, Swap Type	Interest Rate Swaps
Derivative, Notional Amount	$ 600,000
Derivative, Maturity Date	Oct. 26, 2028
Fair Value Hedge Assets	$ 4,646
Santa Monica Business Park [Member]
Derivative [Line Items]
Derivative, Swap Type	Interest Rate Swaps
Derivative, Notional Amount	$ 300,000
Derivative, Maturity Date	Apr. 01, 2025
Fair Value Hedge Assets	$ 6,646
Three Two Five Main Street, Three Five Five Main Street, Ninety Broadway and Kendall Center Green Garage Properties and Unsecured Term Loan
Derivative [Line Items]
Derivative, Notional Amount	1,800,000
Fair Value Hedge Assets	$ 5,652
2023 Unsecured Term Loan
Derivative [Line Items]
Derivative, Swap Type	Interest Rate Swaps
Derivative, Notional Amount	$ 1,200,000
Derivative, Maturity Date	May 16, 2024
Fair Value Hedge Assets	$ 1,006
Minimum [Member] | 325 Main Street, 355 Main Street, 90 Broadway and Kendall Center Green Garage Properties [Member]
Derivative [Line Items]
Derivative, Fixed Interest Rate	3.79%
Minimum [Member] | Santa Monica Business Park [Member]
Derivative [Line Items]
Derivative, Fixed Interest Rate	2.661%
Minimum [Member] | 2023 Unsecured Term Loan
Derivative [Line Items]
Derivative, Fixed Interest Rate	4.638%
Maximum [Member] | 325 Main Street, 355 Main Street, 90 Broadway and Kendall Center Green Garage Properties [Member]
Derivative [Line Items]
Derivative, Fixed Interest Rate	3.798%
Maximum [Member] | Santa Monica Business Park [Member]
Derivative [Line Items]
Derivative, Fixed Interest Rate	2.688%
Maximum [Member] | 2023 Unsecured Term Loan
Derivative [Line Items]
Derivative, Fixed Interest Rate	4.646%