Gladstone Commercial Corporation Annual report pursuant to Section 13 and 15(d)

Real Estate and Intangible Assets - Leasing Activity (Details)

Real Estate and Intangible Assets - Leasing Activity (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) ft² property	Dec. 31, 2018 USD ($) ft² property	Dec. 31, 2017 USD ($)
Real Estate Properties [Line Items]
Number of leased properties \| property	6	3
Aggregate Square Footage \| ft²	266,021	97,178
Annualized GAAP Rent	$ 3,739,000	$ 1,253,000
Tenant Improvement	2,215,000	433,000
Leasing Commissions	$ 1,312,000	242,000
Aggregate Deferred Rent Write Off		200,000	$ 0
Lease revenue		$ 106,798,000	$ 94,799,000
Lease Contraction or Termination
Real Estate Properties [Line Items]
Number of leased properties \| property	3	2
Aggregate Square Footage \| ft²	39,417	169,133
Aggregate Square Footage Reduced \| ft²	111,309	44,032
Aggregate Deferred Rent Write Off	$ 0	$ 184,000
Lease revenue	$ 301,000
Lease revenue		$ 559,000
Weighted Average
Real Estate Properties [Line Items]
Lease Term	9 years 18 days	6 years 3 months 18 days
Minimum
Real Estate Properties [Line Items]
Lease Term	5 years	3 years 7 months 6 days
Maximum
Real Estate Properties [Line Items]
Lease Term	11 years 6 months	7 years
Columbus, Ohio \| Lease Contraction or Termination
Real Estate Properties [Line Items]
Number of leased properties \| property	1
Lease revenue	$ 100,000
Fridley, Minnesota \| Lease Contraction or Termination
Real Estate Properties [Line Items]
Lease revenue	$ 200,000
Mason, Ohio \| Lease Contraction or Termination
Real Estate Properties [Line Items]
Number of leased properties \| property	1
Aggregate Square Footage \| ft²	39,417
Salt Lake City, Utah \| Lease Contraction or Termination
Real Estate Properties [Line Items]
Aggregate Square Footage \| ft²		81,271
Aggregate Square Footage Reduced \| ft²		23,632
Aggregate Deferred Rent Write Off		$ 100,000
Lease revenue		$ 300,000
Champaign, Illinois \| Lease Contraction or Termination
Real Estate Properties [Line Items]
Aggregate Square Footage \| ft²		87,862
Aggregate Square Footage Reduced \| ft²		20,400
Aggregate Deferred Rent Write Off		$ 100,000
Lease revenue		$ 200,000