Organization (Details) ft² in Thousands	Dec. 31, 2025 ft² property unit
Operating Properties
Number of properties \| property	5
731 Lexington Avenue
Operating Properties
Area of property (in square feet)	1,080
731 Lexington Avenue \| Office space
Operating Properties
Area of property (in square feet)	952
731 Lexington Avenue \| Retail space
Operating Properties
Area of property (in square feet)	128
731 Lexington Avenue \| Tenant Occupant \| Home Depot \| Retail space
Operating Properties
Area of property (in square feet)	83
Rego Park II \| Retail space
Operating Properties
Area of property (in square feet)	606
Rego Park II \| Tenant Occupant \| Costco \| Retail space
Operating Properties
Area of property (in square feet)	145
Rego Park II \| Tenant Occupant \| Kohl's \| Retail space
Operating Properties
Area of property (in square feet)	133
Rego Park II \| Tenant Occupant \| Burlington \| Retail space
Operating Properties
Area of property (in square feet)	60
Rego Park II \| Tenant Occupant \| Best Buy \| Retail space
Operating Properties
Area of property (in square feet)	47
Rego Park II \| Tenant Occupant \| Marshalls \| Retail space
Operating Properties
Area of property (in square feet)	40
Flushing
Operating Properties
Area of property (in square feet)	167
Rego Park I
Operating Properties
Area of property (in square feet)	338
The Alexander apartment tower
Operating Properties
Area of property (in square feet)	255
Number of property units \| unit	312