v3.25.2
Document And Entity Information - shares
 9 Months Ended
Sep. 30, 2022
Jul. 21, 2025
Document Information [Line Items]    
Entity Central Index Key 0000928953  
Entity Registrant Name PILLARSTONE CAPITAL REIT  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2022  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2022  
Document Transition Report false  
Entity File Number 001-15409  
Entity Incorporation, State or Country Code MD  
Entity Tax Identification Number 39-6594066  
Entity Address, Address Line One 19407 Park Row, Suite 140  
Entity Address, City or Town Houston  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 77084  
City Area Code 281  
Local Phone Number 747-9997  
Entity Current Reporting Status No  
Entity Interactive Data Current No  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   657,084