Related Party Transactions and Arrangements - Narrative (Details) $ / shares in Units, $ in Thousands		3 Months Ended			6 Months Ended		12 Months Ended
	Apr. 13, 2018	Jun. 30, 2026 USD ($) shares	Mar. 31, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) $ / shares shares	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($) shares	Mar. 29, 2024	Jun. 29, 2020
Related Party Transaction [Line Items]
Common stock, shares outstanding (in shares) | shares		3,163,632			3,163,632		2,692,941
Renewal term					5 years
Period prior to expiration date needed to terminate agreement					180 days
Related party transaction, amount		$ 3,083		$ 2,676	$ 6,005	$ 6,179
Proceeds from notes payable to related parties		900	$ 1,100				$ 700
Professional Fees and Other Reimbursements
Related Party Transaction [Line Items]
Related party transaction, amount		1,292		995	2,662	2,629
New York City Reit Advisors, LLC | Property Management Fees
Related Party Transaction [Line Items]
Related party transaction, amount		300		200	300	500
New York City Reit Advisors, LLC | Reimbursement of Costs and Expenses
Related Party Transaction [Line Items]
Related party transaction, amount		$ 1,300		1,000	$ 2,700	2,600
American Strategic Investment Co. | Bellevue
Related Party Transaction [Line Items]
Ownership percentage		66.30%			66.30%		58.30%
Related Party
Related Party Transaction [Line Items]
Common stock, shares outstanding (in shares) | shares		1,020,053			1,020,053		536,252
Management fee expense		$ 1,500		1,500	$ 3,000	3,000
Fixed interest rate, percent		7.67%	7.67%		7.67%		7.67%
Advisory agreement, board of directors approval percentage					66.00%
Related Party | New York City Reit Advisors, LLC | The Second Advisory Agreement
Related Party Transaction [Line Items]
Related party transaction, termination fee					$ 15,000
Related Party | New York City Reit Advisors, LLC | The Second Advisory Agreement
Related Party Transaction [Line Items]
Base asset management fee as a percentage of benchmark					$ 500
Asset management fee, percentage of benchmark					1.25%
Percentage of benchmark					10.00%
Related Party | New York City Reit Advisors, LLC | The Second Advisory Agreement | Performance-Based Equity Award
Related Party Transaction [Line Items]
Percentage of benchmark					15.00%
Related Party | New York City Reit Advisors, LLC | The Second Advisory Agreement | Minimum
Related Party Transaction [Line Items]
Dividend to common stockholders (in dollars per share) | $ / shares					$ 0.05
Related Party | New York City Reit Advisors, LLC | The Second Advisory Agreement, Core Earnings Per Adjusted Share
Related Party Transaction [Line Items]
Variable management fee (in dollars per share) | $ / shares					0.1944
Related Party | New York City Reit Advisors, LLC | The Second Advisory Agreement, Core Earnings Per Adjusted Share | Performance-Based Equity Award
Related Party Transaction [Line Items]
Variable management fee (in dollars per share) | $ / shares					$ 0.1458
Related Party | New York City Reit Advisors, LLC | Gross Revenue, Stand-alone Single-tenant Net Leased Properties
Related Party Transaction [Line Items]
Percentage of management fees earned	4.00%							3.25%
Related party initial term	1 year
Related party extended initial term	1 year
Other related parties terminate notice period	60 days
Related Party | New York City Reit Advisors, LLC | Reimbursement of Costs and Expenses
Related Party Transaction [Line Items]
Related party transaction related to administrative and overhead expenses		$ 300		200	$ 700	800
Related party transactions related to salaries, wages and benefits		$ 1,000		800	2,000	$ 1,800
Related Party | New York City Reit Advisors, LLC | Reimbursement of Costs and Expenses | Maximum
Related Party Transaction [Line Items]
Related party transaction related to administrative and overhead expenses					400
Asset cost					$ 1,250,000
Related party transactions related to salaries, wages and benefits				$ 3,000
Related Party | New York City Reit Advisors, LLC | Reimbursement of Administrative and Overhead Expenses | Maximum
Related Party Transaction [Line Items]
Operating expenses as a percentage of benchmark		0.10%			0.10%
Related Party | New York City Reit Advisors, LLC | Reimbursement of Wage and Benefit Expenses | Maximum
Related Party Transaction [Line Items]
Operating expenses as a percentage of benchmark		0.30%			0.30%
Related Party | New York City Reit Advisors, LLC | Termination Prior to June 30, 2020 | The Second Advisory Agreement
Related Party Transaction [Line Items]
Termination fee multiplier									3
Related Party | New York City Reit Advisors, LLC | Termination After June 30, 2020 | The Second Advisory Agreement
Related Party Transaction [Line Items]
Termination fee multiplier									4
Related Party | New York City Reit Advisors, LLC | Actual Base Management Fee | The Second Advisory Agreement
Related Party Transaction [Line Items]
Termination fee multiplier									12
Related Party | New York City Reit Advisors, LLC | Actual Variable Management Fee | The Second Advisory Agreement
Related Party Transaction [Line Items]
Termination fee multiplier									4