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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2017
May 30, 2018
Mar. 20, 2018
Document And Entity Information [Abstract]      
Entity Registrant Name PRESIDIO PROPERTY TRUST, INC.    
Entity Central Index Key 0001080657    
Current Fiscal Year End Date --12-31    
Entity Well Known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Smaller Reporting Company    
Trading Symbol SQFT    
Entity Public Float   $ 0  
Entity Common Stock Shares Outstanding     17,667,857
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2017    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2017