Revenue Recognition - Narrative (Details) ft² in Thousands			1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2025 USD ($) ft²	Dec. 03, 2022 USD ($) ft²	May 31, 2024 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2024 USD ($)	May 30, 2024 ft²
Disaggregation of Revenue [Line Items]
Rental revenues				$ 54,915,000	$ 61,397,000
Lease revenues				52,726,000	59,346,000
731 Lexington Avenue Property | Home Depot | Tenant Occupant
Disaggregation of Revenue [Line Items]
Lease revenues	$ 15,000,000
Bloomberg | 731 Lexington Avenue Property
Disaggregation of Revenue [Line Items]
Area of property (in sqft.) | ft²	83						947
Term							11 years
Payments for lease commissions			$ 32,000,000
Bloomberg | 731 Lexington Avenue Property | Third Party Broker
Disaggregation of Revenue [Line Items]
Payments for lease commissions			26,500,000
Bloomberg | 731 Lexington Avenue Property | Vornado
Disaggregation of Revenue [Line Items]
Payments for lease commissions			$ 5,500,000
IKEA | Rego Park 1 Property
Disaggregation of Revenue [Line Items]
Area of property (in sqft.) | ft²		112
Payment for termination of lease						$ 10,000,000
IKEA | Rego Park 1 Property | Minimum
Disaggregation of Revenue [Line Items]
Payment for termination of lease		$ 10,000,000
Customer Concentration Risk | Revenue | Bloomberg
Disaggregation of Revenue [Line Items]
Rental revenues				$ 32,205,000	$ 29,963,000
Percentage rent contributed by tenant				59.00%	49.00%