v3.26.1
Cover - shares
6 Months Ended
Jun. 30, 2026
Aug. 07, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Entity File Number 001-39448  
Entity Registrant Name American Strategic Investment Co.  
Entity Incorporation, State or Country Code MD  
Entity Tax Identification Number 46-4380248  
Entity Address, Address Line One 222 Bellevue Ave.  
Entity Address, City or Town Newport  
Entity Address, State or Province RI  
Entity Address, Postal Zip Code 02840  
City Area Code 212  
Local Phone Number 415-6500  
Title of 12(b) Security Class A common stock, $0.01 par value per share  
Trading Symbol NYC  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   3,163,632
Entity Central Index Key 0001595527  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Amendment Flag false