v3.26.1
Cover
 3 Months Ended
Mar. 31, 2026
Entity Addresses [Line Items]  
Document Type S-4
Amendment Flag false
Entity Registrant Name PRESIDIO PROPERTY TRUST, INC.
Entity Central Index Key 0001080657
Entity Primary SIC Number 6798
Entity Tax Identification Number 33-0841255
Entity Incorporation, State or Country Code MD
Entity Address, Address Line One 4995 Murphy Canyon Road
Entity Address, Address Line Two 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
Entity Filer Category Non-accelerated Filer
Entity Small Business true
Entity Emerging Growth Company false
Business Contact [Member]  
Entity Addresses [Line Items]  
Entity Address, Address Line One 4995 Murphy Canyon Road
Entity Address, Address Line Two 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
Contact Personnel Name Jack K. Heilbron