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

Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Details)

Subsequent Events - Additional Information (Details) $ in Thousands			1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 21, 2020 USD ($) property	Oct. 14, 2020 USD ($) ft² property tenant	Nov. 05, 2020 USD ($) shares	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) mortgage shares	Sep. 30, 2019 USD ($)	Apr. 30, 2020 tenant
Subsequent Event [Line Items]
Number of tenants granted rent deferrals \| tenant								3
Rent obligations deferred (as percent)				2.00%		2.00%		2.00%
Gain on sale of real estate, net				$ 1,196	$ 0	$ 1,184	$ 2,952
Aggregate Purchase Price						82,599	67,272
Repayments on mortgage notes						31,667	48,116
Disposed of by sale
Subsequent Event [Line Items]
Income from real estate and related assets sold				1,285	$ (179)	1,234	$ 107
Gain on sale of real estate, net				$ 1,200		1,200
Fixed rate mortgage loans
Subsequent Event [Line Items]
Repayments on mortgage notes						$ 5,918
Number of properties \| mortgage						5
Stated interest rate (as percent)				6.00%		6.00%
Variable rate mortgage loans
Subsequent Event [Line Items]
Repayments on mortgage notes						$ 16,107
LIBOR \| Variable rate mortgage loans
Subsequent Event [Line Items]
Weighted average interest rate variable rate debt repaid (as percent)						2.19%
Subsequent Event \| October Cash Base Rent Obligations
Subsequent Event [Line Items]
Rent obligations collected (as percent)			100.00%
Subsequent Event \| Third Quarter 2020 Cash Base Rent Obligations
Subsequent Event [Line Items]
Rent obligations collected (as percent)			99.00%
Subsequent Event \| Champaign, Illinois \| Disposed of by sale
Subsequent Event [Line Items]
Number of properties sold \| property	3
Proceeds from sale of real estate	$ 13,400
Gain on sale of real estate, net	$ 4,100
Subsequent Event \| Montgomery, Alabama
Subsequent Event [Line Items]
Aggregate Square Footage \| ft²		240,714
Aggregate Purchase Price		$ 14,300
Number of tenants \| tenant		1
Weighted Average Lease Term		7 years
Subsequent Event \| Fixed rate mortgage loans
Subsequent Event [Line Items]
Repayments on mortgage notes		$ 12,200
Number of properties \| property		2
Stated interest rate (as percent)		4.79%
Subsequent Event \| Variable rate mortgage loans
Subsequent Event [Line Items]
Repayments on mortgage notes		$ 3,200
Number of properties \| property		1
Subsequent Event \| LIBOR \| Variable rate mortgage loans
Subsequent Event [Line Items]
Weighted average interest rate variable rate debt repaid (as percent)		2.25%
Common Stock \| Subsequent Event
Subsequent Event [Line Items]
Consideration received			$ 1,400
Redeemable preferred stock, shares issued (in shares) \| shares			82,407
Series E Preferred Stock \| Preferred Stock \| Subsequent Event
Subsequent Event [Line Items]
Consideration received			$ 1,200
Redeemable preferred stock, shares issued (in shares) \| shares			50,033
Series F Preferred Stock \| Preferred Stock
Subsequent Event [Line Items]
Consideration received						$ 1,000
Redeemable preferred stock, shares issued (in shares) \| shares						45,102
Series F Preferred Stock \| Preferred Stock \| Subsequent Event
Subsequent Event [Line Items]
Consideration received			$ 400
Redeemable preferred stock, shares issued (in shares) \| shares			18,459