v3.26.1
Cover
Apr. 15, 2026
Entity Listings [Line Items]  
Document Type 8-K
Document Period End Date Apr. 15, 2026
Entity Registrant Name American Strategic Investment Co.
Entity Incorporation, State or Country Code MD
Entity File Number 001-39448
Entity Tax Identification Number 46-4380248
Entity Address, Address Line One 222 Bellevue Avenue
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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Entity Central Index Key 0001595527
Amendment Flag false
Class A common stock, $0.01 par value per share  
Entity Listings [Line Items]  
Title of 12(b) Security Class A common stock, $0.01 par value per share
Trading Symbol NYC
Security Exchange Name NYSE
Class A Preferred Stock Purchase Rights  
Entity Listings [Line Items]  
Title of 12(b) Security Class A Preferred Stock Purchase Rights
Security Exchange Name NYSE
No Trading Symbol Flag true