Gladstone Commercial : XBRL Q3 2020

Quarterly report pursuant to Section 13 or 15(d)

Cover Page

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