Quarterly report pursuant to Section 13 or 15(d)

Cover Page

v3.20.2
Cover Page - shares
 9 Months Ended
Sep. 30, 2020
Nov. 05, 2020
Entity Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2020  
Document Transition Report false  
Entity Central Index Key 0001234006  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --12-31  
Amendment Flag false  
Entity File Number 001-33097  
Entity Registrant Name GLADSTONE COMMERCIAL CORP  
Entity Incorporation, State or Country Code MD  
Entity Tax Identification Number 02-0681276  
Entity Address, Address Line One 1521 Westbranch Drive,  
Entity Address, Address Line Two Suite 100  
Entity Address, City or Town McLean,  
Entity Address, State or Province VA  
Entity Address, Postal Zip Code 22102  
City Area Code 703  
Local Phone Number 287-5800  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   34,268,297
Common Stock    
Entity Information [Line Items]    
Title of 12(b) Security Common Stock, par value $0.001 per share  
Trading Symbol GOOD  
Security Exchange Name NASDAQ  
7.00% Series D Cumulative Redeemable Preferred Stock    
Entity Information [Line Items]    
Title of 12(b) Security 7.00% Series D Cumulative Redeemable Preferred Stock, par value $0.001 per share  
Trading Symbol GOODM  
Security Exchange Name NASDAQ  
6.625% Series E Cumulative Redeemable Preferred Stock    
Entity Information [Line Items]    
Title of 12(b) Security 6.625% Series E Cumulative Redeemable Preferred Stock, par value $0.001 per share  
Trading Symbol GOODN  
Security Exchange Name NASDAQ