Gladstone Commercial Corporation Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Summary of Acquired Properties (Details)

Real Estate and Intangible Assets - Summary of Acquired Properties (Details) $ in Thousands										6 Months Ended	9 Months Ended
	Sep. 26, 2019 USD ($) ft²	Jul. 30, 2019 USD ($) ft²	Jun. 18, 2019 USD ($) ft²	Apr. 30, 2019 USD ($) ft²	Apr. 05, 2019 USD ($) ft²	Feb. 28, 2019 USD ($) ft²	Feb. 08, 2019 USD ($) ft²	Sep. 20, 2018 USD ($) ft²	Mar. 09, 2018 USD ($) ft²	Jun. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) ft²	Sep. 30, 2018 USD ($) ft²
Business Acquisition [Line Items]
Aggregate Purchase Price											$ 67,272	$ 22,800
Philadelphia, Pennsylvania
Business Acquisition [Line Items]
Aggregate Square Footage \| ft²							26,050
Weighted Average Lease Term							15 years 23 days
Aggregate Purchase Price							$ 2,700
Aggregate Annualized GAAP Rent							$ 200
Indianapolis, Indiana
Business Acquisition [Line Items]
Aggregate Square Footage \| ft²						34,800
Weighted Average Lease Term						10 years 1 day
Aggregate Purchase Price						$ 3,600
Aggregate Annualized GAAP Rent						$ 300
Ocala, Florida
Business Acquisition [Line Items]
Aggregate Square Footage \| ft²					207,000
Weighted Average Lease Term					20 years 26 days
Aggregate Purchase Price					$ 11,900
Aggregate Annualized GAAP Rent					$ 800
Ocala, Florida
Business Acquisition [Line Items]
Aggregate Square Footage \| ft²					176,000
Weighted Average Lease Term					20 years 26 days
Aggregate Purchase Price					$ 7,300
Aggregate Annualized GAAP Rent					$ 700
Columbus, Ohio
Business Acquisition [Line Items]
Aggregate Square Footage \| ft²				54,430				157,810
Weighted Average Lease Term				7 years				15 years 11 days
Aggregate Purchase Price				$ 3,200				$ 8,500
Aggregate Annualized GAAP Rent				$ 200				800
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, New Mortgage Loan								$ 4,700
Tifton, Georgia
Business Acquisition [Line Items]
Aggregate Square Footage \| ft²			676,031
Weighted Average Lease Term			8 years 5 months 13 days
Aggregate Purchase Price			$ 17,900
Aggregate Annualized GAAP Rent			$ 1,600
Denton, Texas
Business Acquisition [Line Items]
Aggregate Square Footage \| ft²		78,452
Weighted Average Lease Term		11 years 11 months 1 day
Aggregate Purchase Price		$ 6,600
Aggregate Annualized GAAP Rent		$ 500
Temple, Texas
Business Acquisition [Line Items]
Aggregate Square Footage \| ft²	211,000
Weighted Average Lease Term	20 years
Aggregate Purchase Price	$ 14,100
Aggregate Annualized GAAP Rent	$ 1,200
Vance, Alabama
Business Acquisition [Line Items]
Aggregate Square Footage \| ft²									127,444
Weighted Average Lease Term									9 years 9 months 18 days
Aggregate Purchase Price									$ 14,300
Aggregate Annualized GAAP Rent									$ 1,100
Series of Property Acquisitions
Business Acquisition [Line Items]
Aggregate Square Footage \| ft²											1,463,763	285,254
Weighted Average Lease Term											14 years 9 months 18 days	11 years 8 months 12 days
Aggregate Purchase Price											$ 67,272	$ 22,800
Acquisition Expenses										$ 200	621	225
Aggregate Annualized GAAP Rent											5,437	1,851
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, New Mortgage Loan											8,900	$ 4,745
New fixed rate mortgage notes payable
Business Acquisition [Line Items]
Aggregate Fixed Rate Debt Issued											$ 41,140
Stated interest rate (as percent)											3.95%
New fixed rate mortgage notes payable \| Tifton, Georgia
Business Acquisition [Line Items]
Aggregate Fixed Rate Debt Issued											$ 8,900
Stated interest rate (as percent)											4.35%