| Document And Entity Information | Feb. 23, 2021 |
| Document Information [Line Items] | |
| Entity, Registrant Name | PRESIDIO PROPERTY TRUST, INC. |
| Document, Type | 8-K |
| Document, Period End Date | Feb. 23, 2021 |
| Entity, Incorporation, State or Country Code | MD |
| Entity, File Number | 001-34049 |
| Entity, Tax Identification Number | 33-0841255 |
| Entity, Address, Address Line One | 4995 Murphy Canyon Road, Suite 300 |
| Entity, Address, City or Town | San Diego |
| Entity, Address, State or Province | CA |
| Entity, Address, Postal Zip Code | 92123 |
| City Area Code | 760 |
| Local Phone Number | 471-8536 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Series A Common Stock |
| Trading Symbol | SQFT |
| Security Exchange Name | NASDAQ |
| Entity, Emerging Growth Company | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0001080657 |
