| Cover | Dec. 28, 2023 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Dec. 28, 2023 |
| Entity File Number | 001-39448 |
| Entity Registrant Name | American Strategic Investment Co. |
| Entity Central Index Key | 0001595527 |
| Entity Tax Identification Number | 46-4380248 |
| Entity Incorporation, State or Country Code | MD |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Class A common stock, $0.01 par value per share |
| Trading Symbol | NYC |
| Security Exchange Name | NYSE |
| Rights [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Class A Preferred Stock Purchase Rights |
| Trading Symbol | true |
| Security Exchange Name | NYSE |
