Significant Accounting Policies - Schedule of Properties Contributed of Annualized Cash Rent (Details) - Annualized Rent	3 Months Ended	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2025 tenant
Customer Concentration
Concentration of Credit Risk
Number of tenants (tenants)		1
Maximum percentage of annualized rent for any one tenant not individually disclosed (percent) (more than)	5.00%	5.00%
Investment Property Concentration Risk | One Vanderbilt Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	12.50%
Investment Property Concentration Risk | 11 Madison Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	7.90%
Investment Property Concentration Risk | 500 Park Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	6.90%
Investment Property Concentration Risk | 245 Park Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	6.80%
Investment Property Concentration Risk | 1515 Broadway
Concentration of Credit Risk
Percentage of concentration (percent)	6.30%
Investment Property Concentration Risk | 1185 Avenue of the Americas
Concentration of Credit Risk
Percentage of concentration (percent)	6.20%
Tenant 1 | Customer Concentration
Concentration of Credit Risk
Percentage of concentration (percent)		5.30%