Real Estate Properties - Unconsolidated Joint Ventures (Details) $ in Thousands		3 Months Ended
	Mar. 31, 2024 USD ($) ft² property joint_venture	Mar. 31, 2024 USD ($) ft² property joint_venture	Dec. 31, 2023 USD ($)
Real Estate [Line Items]
Number of joint ventures | joint_venture	2	2
Unconsolidated Joint Ventures
Real Estate [Line Items]
Number of properties (in properties) | property	3	3
Investment at carrying value	$ 17,898	$ 17,898	$ 18,128
Rentable square feet (in square feet) | ft²	471,000	471,000
Unamortized basis difference	$ 694	$ 694
Unconsolidated Joint Ventures | Mortgages
Real Estate [Line Items]
Interest rate (as a percent)	3.93%	3.93%
Principal balance	$ 82,000	$ 82,000	82,000
Unconsolidated Joint Ventures | Prosperity Metro Plaza
Real Estate [Line Items]
Number of properties (in properties) | property	2	2
Ownership percentage	51.00%	51.00%
Investment at carrying value	$ 17,898	$ 17,898	18,128
Rentable square feet (in square feet) | ft²	346,000	346,000
Unconsolidated Joint Ventures | Prosperity Metro Plaza | Mortgages
Real Estate [Line Items]
Interest rate (as a percent)	4.09%	4.09%
Principal balance	$ 50,000	$ 50,000	50,000
Unconsolidated Joint Ventures | 1750 H Street, NW
Real Estate [Line Items]
Number of properties (in properties) | property	1	1
Ownership percentage	50.00%	50.00%
Investment at carrying value	$ 0	$ 0	0
Rentable square feet (in square feet) | ft²	125,000	125,000
Unconsolidated Joint Ventures | 1750 H Street, NW | Mortgages
Real Estate [Line Items]
Interest rate (as a percent)	3.69%	3.69%
Principal balance	$ 32,000	$ 32,000	$ 32,000