Fair Value of Financial Intruments - Summary of outstanding interest rate swap agreements (Details) $ in Millions	Sep. 30, 2025 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total notional amounts of interest rate swap agreements	$ 551.0
Derivative Asset	2.8
Unsecured term loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Mortgages and notes payable	$ 300.0	[1]
Fixed interest rate of derivative instrument	4.21%	[1]
Derivative Liability	$ (0.3)	[1]
Mortgages payable | Bethesda Row
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Mortgages and notes payable	$ 200.0
Fixed interest rate of derivative instrument	5.03%
Derivative Liability	$ (0.1)
Mortgages payable | Hoboken
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Mortgages and notes payable	$ 51.0
Fixed interest rate of derivative instrument	3.67%
Derivative Asset	$ 3.2

[1] (1) These interest rate swaps were entered into during the three months ended September 30, 2025, and fix the interest rate on $300.0 million of our unsecured term loan.