Related Party Transactions and Arrangements - Narrative (Details) $ / shares in Units, $ in Thousands		3 Months Ended		12 Months Ended
	Apr. 13, 2018	Mar. 31, 2026 USD ($) $ / shares shares	Mar. 31, 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		2,692,941		2,692,941
Renewal term		5 years
Period prior to expiration date needed to terminate agreement		180 days
Related party transaction, amount		$ 2,876	$ 3,502
Proceeds from notes payable to related parties		1,100		$ 700
Professional Fees and Other Reimbursements
Related Party Transaction [Line Items]
Related party transaction, amount		1,324	1,634
New York City Reit Advisors, LLC | Property Management Fees
Related Party Transaction [Line Items]
Related party transaction, amount		0	400
New York City Reit Advisors, LLC | Reimbursement of Costs and Expenses
Related Party Transaction [Line Items]
Related party transaction, amount		$ 1,300	1,600
American Strategic Investment Co. | Bellevue
Related Party Transaction [Line Items]
Ownership percentage		59.20%		58.30%
Related Party
Related Party Transaction [Line Items]
Common stock, shares outstanding (in shares) | shares		536,252		536,252
Management fee expense		$ 1,500	1,500
Fixed interest rate, percent		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		$ 100	600
Related party transactions related to salaries, wages and benefits		1,200	1,100
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%
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%
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