Table of Contents

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

(Mark One)

FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2016

OR

FOR THE TRANSITION PERIOD FROM                      TO                     

COMMISSION FILE NUMBER: 001-33097

GLADSTONE COMMERCIAL CORPORATION

(Exact name of registrant as specified in its charter)

(703) 287-5800

(Registrant’s telephone number, including area code)

Not Applicable

(Former name, former address and formal fiscal year, if changed since last report)

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  x

The number of shares of the registrant’s Common Stock, $0.001 par value, outstanding as of April 27, 2016 was 22,613,352.

Table of Contents

GLADSTONE COMMERCIAL CORPORATION

FORM 10-Q FOR THE QUARTER ENDED

March  31, 2016

TABLE OF CONTENTS

2

Table of Contents

PART I – FINANCIAL INFORMATION

Item 1. Financial Statements

Gladstone Commercial Corporation

Condensed Consolidated Balance Sheets

(Dollars in Thousands, Except Share and Per Share Data)

(Unaudited)

The accompanying notes are an integral part of these consolidated financial statements.

3

Table of Contents

Gladstone Commercial Corporation

Condensed Consolidated Statements of Operations

(Dollars in Thousands, Except Share and Per Share Data)

(Unaudited)

The accompanying notes are an integral part of these condensed consolidated financial statements.

4

Table of Contents

Gladstone Commercial Corporation

Condensed Consolidated Statements of Cash Flows

(Dollars in Thousands)

(Unaudited)

The accompanying notes are an integral part of these condensed consolidated financial statements.

5

Table of Contents

Gladstone Commercial Corporation

Notes to Condensed Consolidated Financial Statements (Unaudited)

1. Organization, Basis of Presentation and Significant Accounting Policies

Gladstone Commercial Corporation is a real estate investment trust, or REIT, that was incorporated under the General Corporation Law of the State of Maryland on February 14, 2003. We focus on acquiring, owning and managing primarily office and industrial properties. On a selective basis, we may make long term industrial and commercial mortgage loans; however, we do not have any mortgage loans currently outstanding. Subject to certain restrictions and limitations, our business is managed by Gladstone Management Corporation, a Delaware corporation, or the Adviser, and administrative services are provided by Gladstone Administration, LLC, a Delaware limited liability company, or the Administrator, each pursuant to a contractual arrangement with us. Our Adviser and Administrator collectively employ all of our personnel and pay their salaries, benefits, and general expenses directly. Gladstone Commercial Corporation conducts substantially all of its operations through a subsidiary, Gladstone Commercial Limited Partnership, a Delaware limited partnership, or the Operating Partnership.

All further references herein to “we,” “our,” “us” and the “Company” mean Gladstone Commercial Corporation and its consolidated subsidiaries, except where it is made clear that the term means only Gladstone Commercial Corporation.

Interim Financial Information

Our interim financial statements are prepared in accordance with U.S. generally accepted accounting principles, or GAAP, for interim financial information and pursuant to the requirements for reporting on Form 10-Q and in accordance with Article 10 of Regulation S-X. Accordingly, certain disclosures accompanying annual financial statements prepared in accordance with GAAP are omitted. The year-end balance sheet data presented herein was derived from audited financial statements, but does not include all disclosures required by GAAP. In the opinion of our management, all adjustments, consisting solely of normal recurring accruals, necessary for the fair presentation of financial statements for the interim period, have been included. The interim financial statements and notes thereto should be read in conjunction with the financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2015, as filed with the U.S. Securities and Exchange Commission on February 17, 2016. The results of operations for the three months ended March 31, 2016 are not necessarily indicative of the results that may be expected for other interim periods or for the full fiscal year.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could materially differ from those estimates.

Critical Accounting Policies

The preparation of our financial statements in accordance with GAAP requires management to make judgments that are subjective in nature in order to make certain estimates and assumptions. Application of these accounting policies involves the exercise of judgment regarding the use of assumptions as to future uncertainties, and as a result, actual results could materially differ from these estimates. A summary of all of our significant accounting policies is provided in Note 1 to our consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2015. There were no material changes to our critical accounting policies during the three months ended March 31, 2016.

6

Table of Contents

Recently Issued Accounting Pronouncements

In February 2016, the FASB issued ASU 2016-02, “Leases: Amendments to the FASB Accounting Standards Codification” (“ASU 2016-02”), The new standard requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase by the lessee. This classification will determine whether lease expense is recognized based on an effective interest method or on a straight line basis over the term of the lease, respectively. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less will be accounted for similar to existing guidance for operating leases today. The new standard requires lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases, direct financing leases and operating leases. ASU 2016-02 is expected to minimally impact our consolidated financial statements as we have four operating ground lease arrangement for which we are the lessee. We also expect to our legal expense to increase as the new standard requires us to expense indirect leasing costs that were previously capitalized to leasing commissions. ASC 2016-02 supersedes the previous leases standard, ASC 840 Leases. The standard is effective on January 1, 2019, with early adoption permitted. We are in the process of evaluating the impact of this new guidance.

Reclassifications

Certain prior year amounts have been reclassified to conform to the current year presentation.

In April 2015, the FASB issued ASU 2015-03, “Simplifying the Presentation of Debt Issuance Costs” (“ASU-2015-03”), which simplifies the presentation of debt issuance costs. ASU 2015-03 requires the presentation of debt issuance costs in the balance sheet as a deduction from the carrying amount of the related debt liability instead of a deferred financing cost. ASU 2015-03 is effective for annual periods beginning after December 15, 2015. We have adopted the provisions of ASU 2015-03 for the three months ended March 31, 2016. We had unamortized deferred financing fees of $6.0 and $6.1 million as of March 31, 2016 and December 31, 2015, respectively. These costs have been reclassified from deferred financing costs, net, to mortgage notes payable, net, borrowings under line of credit, net, borrowings under term loan facility, net, and Series C mandatorily redeemable preferred stock, net. All periods presented have been retrospectively adjusted.

The following table summarizes the retrospective adjustment and the overall impact on the previously reported consolidated financial statements (dollars in thousands):

7

Table of Contents

2. Related-Party Transactions

Gladstone Management and Gladstone Administration

We are externally managed pursuant to contractual arrangements with our Adviser and our Administrator, which collectively employ all of our personnel and pay their salaries, benefits, and general expenses directly. Both our Adviser and Administrator are affiliates of ours, as their parent company is owned and controlled by Mr. David Gladstone, our chairman and chief executive officer. Two of our executive officers, Mr. Gladstone and Mr. Terry Brubaker (our vice chairman and chief operating officer) serve as directors and executive officers of our Adviser and our Administrator. Mr. Michael LiCalsi, our general counsel and secretary, serves as our Administrator’s president. We have an advisory agreement with our Adviser, and an administration agreement with our Administrator, or the Administration Agreement. The services and fees under the advisory agreement and Administration Agreement are described below. At both March 31, 2016 and December 31, 2015, $1.9 million, was collectively due to our Adviser and Administrator.

Base Management Fee

On July 24, 2015, we entered into an amended and restated advisory agreement, or the Amended Advisory Agreement, with the Adviser. Our entrance into the agreement was approved unanimously by our Board of Directors, including separate and unanimous approval by the independent directors on our Board of Directors. Our Board of Directors generally reviews and considers approving or renewing the agreement with our Adviser each July.

Pursuant to the terms of the Amended Advisory Agreement, effective July 1, 2015, the calculation of the annual base management fee equals 1.5% of our adjusted total stockholders’ equity, which is our total stockholders’ equity (before giving effect to the base management fee and incentive fee), adjusted to exclude the effect of any unrealized gains or losses that do not affect realized net income (including impairment charges) and adjusted for any one-time events and certain non-cash items (the later to occur for a given quarter only upon the approval of our Compensation Committee). The fee is calculated and accrued quarterly as 0.375% per quarter of such adjusted total stockholders’ equity figure.

Prior to its amendment and restatement on July 24, 2015, our then-existing advisory agreement with the Adviser, or the Former Advisory Agreement, provided for an annual base management fee equal to 2.0% of our common stockholders’ equity, which was our total stockholders’ equity, less the recorded value of any preferred stock and adjusted to exclude the effect of any unrealized gains, losses, or other items that did not affect realized net income (including impairment charges).

For both the three months ended March 31, 2016 and 2015, we recorded a base management fee of $0.9 million.

Incentive Fee

Under the Amended Advisory Agreement, effective July 1, 2015, the calculation of the incentive fee was revised to reward the Adviser in circumstances where our quarterly Core FFO (defined at the end of this paragraph), before giving effect to any incentive fee, or pre-incentive fee Core FFO, exceeds 2.0% quarterly, or 8.0% annualized, of adjusted total stockholders’ equity (after giving effect to the base management fee but before giving effect to the incentive fee). We refer to this as the new hurdle rate. The Adviser will receive 15.0% of the amount of our pre-incentive fee Core FFO that exceeds the new hurdle rate. However, in no event shall the incentive fee for a particular quarter exceed by 15.0% (the cap) the average quarterly incentive fee paid by us for the previous four quarters (excluding quarters for which no incentive fee was paid). Core FFO is defined as GAAP net income (loss) available to common stockholders, excluding the incentive fee, depreciation and amortization, any realized and unrealized gains, losses or other non-cash items recorded in net income (loss) available to common stockholders for the period, and one-time events pursuant to changes in GAAP.

The incentive fee under the Former Advisory Agreement rewarded the Adviser in circumstances where our quarterly FFO, before giving effect to any incentive fee, or pre-incentive fee FFO, exceeded 1.75%, or 7.0% annualized, or the hurdle rate, of common stockholders’ equity. Funds from operations, or FFO, included any realized capital gains and capital losses, less any distributions paid on preferred stock and Senior Common Stock, but FFO did not include any unrealized capital gains or losses (including impairment charges). The Adviser received 100.0% of the amount of the pre-incentive fee FFO that exceeded the hurdle rate, but was less than 2.1875% of our common stockholders’ equity. The Adviser also received an incentive fee of 20.0% of the amount of our pre-incentive fee FFO that exceeded 2.1875% of common stockholders’ equity.

8

Table of Contents

For the three months ended March 31, 2016 and 2015, we recorded an incentive fee of $0.6 million and $1.7 million, respectively, offset by credits related to unconditional, voluntary and irrevocable waivers issued by the Adviser of $0.0 million and $1.2 million, respectively, resulting in a net incentive fee for the three months ended March 31, 2016 and 2015, of $0.6 million and $0.5 million, respectively. Our Board of Directors accepted the Adviser’s offer to waive, on a quarterly basis, a portion of the incentive fee for the three months covering January 1, 2015 through March 31, 2015 in order to support the current level of distributions to our stockholders. The Adviser did not waive any portion of the incentive fee for the three months ended March 31, 2016. Waivers cannot be recouped by the Adviser in the future.

Capital Gain Fee

Under the Amended Advisory Agreement, effective July 1, 2015, we will pay to the Adviser a capital gains-based incentive fee that will be calculated and payable in arrears as of the end of each fiscal year (or upon termination of the agreement). In determining the capital gain fee, we will calculate aggregate realized capital gains and aggregate realized capital losses for the applicable time period. For this purpose, aggregate realized capital gains and losses, if any, equals the realized gain or loss calculated by the difference between the sales price of the property, less any costs to sell the property and the current gross value of the property (which is calculated as the original acquisition price plus any subsequent non-reimbursed capital improvements). At the end of the fiscal year, if this number is positive, then the capital gain fee payable for such time period shall equal 15.0% of such amount. No capital gain was fee was recognized during the three months ended March 31, 2016 or 2015, respectively.

Termination Fee

The Amended Advisory Agreement includes a termination fee whereby, in the event of our termination of the agreement without cause (with 120 days’ prior written notice and the vote of at least two-thirds of our independent directors), a termination fee would be payable to the Adviser equal to two times the sum of the average annual base management fee and incentive fee earned by the Adviser during the 24-month period prior to such termination. A termination fee is also payable if the Adviser terminates the agreement after the Company has defaulted and applicable cure periods have expired. The agreement may also be terminated for cause by us (with 30 days’ prior written notice and the vote of at least two-thirds of our independent directors), with no termination fee payable. Cause is defined in the agreement to include if the Adviser breaches any material provisions of the agreement, the bankruptcy or insolvency of the Adviser, dissolution of the Adviser and fraud or misappropriation of funds.

Administration Agreement

Pursuant to the Administration Agreement, we pay for our allocable portion of the Administrator’s expenses in performing services to us, including, but not limited to, rent and the salaries and benefits of its personnel, including our chief financial officer, treasurer, chief compliance officer, general counsel and secretary (who also serves as our Administrator’s president), and their respective staffs. Our allocable portion of the Administrator’s expenses is derived by multiplying our Administrator’s total expenses by the approximate percentage of time the Administrator’s employees perform services for us in relation to their time spent performing services for all companies serviced by our Administrator under contractual agreements. For both the three months ended March 31, 2016 and 2015, we recorded an administration fee of $0.4 million. Our Board of Directors generally reviews and considers approving or renewing the agreement with our Administrator each July.

Gladstone Securities

Gladstone Securities, LLC, or Gladstone Securities, is a privately held broker dealer registered with the Financial Industry Regulatory Authority and insured by the Securities Investor Protection Corporation. Gladstone Securities is an affiliate of ours, as its parent company is owned and controlled by Mr. David Gladstone, our chairman and chief executive officer. Mr. Gladstone also serves on the board of managers of Gladstone Securities.

9

Table of Contents

Dealer Manager Agreement

In connection with the offering of our Senior Common Stock (see footnote 10, “Stockholders’ Equity,” for further details) we entered into a Dealer Manager Agreement, dated March 25, 2011, or the Dealer Manager Agreement, with Gladstone Securities pursuant to which Gladstone Securities agreed to act as our exclusive dealer manager in connection with the offering. The Dealer Manager Agreement terminated according to its terms on March 28, 2015, requiring us to write-off $0.1 million of deferred offering costs to general and administrative expense. Pursuant to the terms of the Dealer Manager Agreement, Gladstone Securities was entitled to receive a sales commission in the amount of 7.0% of the gross proceeds of the shares of Senior Common Stock sold, plus a dealer manager fee in the amount of 3.0% of the gross proceeds of the shares of Senior Common Stock sold. In addition, we agreed to indemnify Gladstone Securities against various liabilities, including certain liabilities arising under the federal securities laws. We made approximately $0.3 million of payments during the three months ended March 31, 2015, to Gladstone Securities pursuant to this agreement.

Mortgage Financing Arrangement Agreement

We also entered into an agreement with Gladstone Securities, effective June 18, 2013, for it to act as our non-exclusive agent to assist us with arranging mortgage financing for properties we own. In connection with this engagement, Gladstone Securities may from time to time solicit the interest of various commercial real estate lenders or recommend to us third party lenders offering credit products or packages that are responsive to our needs. We pay Gladstone Securities a financing fee in connection with the services it provides to us for securing mortgage financing on any of our properties. The amount of these financing fees, which are payable upon closing of the financing, are based on a percentage of the amount of the mortgage, generally ranging from 0.15% to a maximum of 1.0% of the mortgage obtained. The amount of the financing fees may be reduced or eliminated, as determined by us and Gladstone Securities, after taking into consideration various factors, including, but not limited to, the involvement of any third party brokers and market conditions. We paid financing fees to Gladstone Securities of $0.1 million and $0.04 million during the three months ended March 31, 2016 and 2015, respectively, which are reflected as mortgage notes payable, net, in the condensed consolidated balance sheets, or 0.43% and 0.26% of total mortgages secured. Our Board of Directors will determine whether to renew the agreement for an additional year at its July 2016 meeting.

3. Loss per Share of Common Stock

The following tables set forth the computation of basic and diluted loss per share of common stock for the three months ended March 31, 2016 and 2015, respectively. We computed basic loss per share for the three months ended March 31, 2016 and 2015, respectively, using the weighted average number of shares outstanding during the periods. Diluted loss per share for the three months ended March 31, 2016 and 2015, reflects additional shares of common stock related to our convertible Senior Common Stock (if the effect would be dilutive), that would have been outstanding if dilutive potential shares of common stock had been issued, as well as an adjustment to net income available to common stockholders as applicable to common stockholders that would result from their assumed issuance (dollars in thousands, except per share amounts).

10

Table of Contents

4. Real Estate and Intangible Assets

Real Estate

The following table sets forth the components of our investments in real estate as of March 31, 2016 and December 31, 2015 (dollars in thousands):

Real estate depreciation expense on building and tenant improvements were $5.9 million and $5.2 million for the three months ended March 31 2016 and 2015, respectively.

11

Table of Contents

Pro Forma

The following table reflects pro-forma consolidated statements of operations as if the properties acquired during the three months ended March 31, 2016 and the twelve months ended December 31, 2015, respectively, were acquired as of January 1, 2015. We did not complete any acquisitions during the three months ended March 31, 2016, and pro-forma net loss is identical to the income statement for the same period. The pro-forma earnings for the three months ended March 31, 2014 were adjusted to assume that the acquisition-related costs were incurred as of the previous period (dollars in thousands, except per share amounts):

Significant Real Estate Activity on Existing Assets

During the three months ended March 31, 2016, we executed a lease on one property, which is summarized below (dollars in thousands):

2015 Real Estate Activity

Q1 2015 Investment Activity

During the three months ended March 31, 2015, we acquired two properties, which are summarized below (dollars in thousands):

12

Table of Contents

In accordance with ASC 805, we determined the fair value of the acquired assets and assumed liabilities related to the two properties acquired during the three months ended March 31, 2015, as follows (dollars in thousands):

Below is a summary of the total revenue and earnings recognized on the two properties acquired during the three months ended March 31, 2015 (dollars in thousands):

Q1 2015 Leasing Activity

During the three months ended March 31, 2015, we amended four of our leases, which are summarized below (dollars in thousands):

13

Table of Contents

Intangible Assets

The following table summarizes the carrying value of intangible assets, liabilities and the accumulated amortization for each intangible asset and liability class as of March 31, 2016 and December 31, 2015 respectively (in thousands):

Total amortization expense related to in-place leases, leasing costs and customer relationship lease intangible assets was $3.3 million and $3.0 million for the three months ended March 31, 2016 and 2015, respectively, and is included in depreciation and amortization expense in the condensed consolidated statement of operations.

Total amortization related to above-market lease values was $0.1 million for both the three months ended March 31, 2016 and 2015, respectively, and is included in rental income in the condensed consolidated statement of operations. Total amortization related to below-market lease values was $0.2 million for both the three months ended March 31, 2016 and 2015, respectively, and is included in rental income in the condensed consolidated statement of operations.

5. Real Estate Held for Sale and Impairment Charges

Real Estate Held for Sale

As of March 31, 2016, we classified one property located in Dayton, Ohio, one property located in Rock Falls, Illinois and two properties located in Angola, Indiana, as held for sale under the provisions of ASC 360-10, “Property, Plant, and Equipment,” which requires that the assets and liabilities of any such properties, be presented separately in our condensed consolidated balance sheet in the current period presented. We have executed a sale agreement to sell our Dayton, Ohio property for $0.2 million. We expect this sale to close during the second quarter of 2016. We are currently marketing our properties located in Rock Falls, Illinois and Angola, Indiana that are held for sale.

14

Table of Contents

The table below summarizes the components of income from real estate and related assets held for sale (dollars in thousands):

The table below summarizes the components of the assets and liabilities held for sale reflected on the accompanying condensed consolidated balance sheet (dollars in thousands):

Impairment Charge

We performed the evaluation and analysis on our portfolio and determined that our Dayton, Ohio property was further impaired during the three months ended March 31, 2016. During the three months ended March 31, 2016, we executed a sale agreement to sell this property for $0.2 million, and impaired this property by an additional $0.04 million to reduce our carrying value to the sale price less cost to sell. The fair value was calculated using Level 3 inputs which include an executed purchase and sale agreement and estimated selling costs. This property was previously impaired by $0.6 million during fiscal year 2015. We anticipate selling this property during second quarter 2016. No other impairment was recognized on our portfolio during both the three months ended March 31, 2016 and March 31, 2015, respectively.

6. Mortgage Note Receivable

On July 25, 2014, we closed a $5.6 million second mortgage development loan for the construction of an 81,371 square foot, build-to-suit transitional care facility located on a major hospital campus in Phoenix, Arizona. Subsequently, on April 14, 2015, we closed an additional $0.3 million interim financing loan for the development of the Phoenix, Arizona property. Construction was completed in July 2015 and we earned 9.0% interest, paid currently in cash, on the loan during construction and through maturity. Prior to completion of the facility, we were granted a right of first offer to purchase the property at fair value. We elected not to purchase the property, and received an exit fee upon maturity of the loan in an amount sufficient for us to earn an internal rate of return of 22% on the second mortgage development loan,

15

Table of Contents

inclusive of interest earned. We recognized $0.4 million and $0.3 million in both cash interest income and exit fee revenue during the three months ended March 31, 2016 and 2015, respectively. The principal balance of the loans and all associated interest and exit fee revenue was received in January 2016.

7. Mortgage Notes Payable, Line of Credit and Term Loan Facility

Our mortgage notes payable and line of credit as of March 31, 2016 and December 31, 2015 are summarized below (dollars in thousands):

N/A - Not Applicable

Mortgage Notes Payable

As of March 31, 2016, we had 43 mortgage notes payable, collateralized by a total of 75 properties with a net book value of $638.5 million. Gladstone Commercial Corporation has limited recourse liabilities that could result from any one or more of the following circumstances: a borrower voluntarily filing for bankruptcy, improper conveyance of a property, fraud or material misrepresentation, misapplication or misappropriation of rents, security deposits, insurance proceeds or condemnation proceeds, or physical waste or damage to the property resulting from a borrower’s gross negligence or willful misconduct. Gladstone Commercial Corporation has full recourse for $2.9 million of the mortgages notes payable outstanding, or 0.6%. We will also indemnify lenders against claims resulting from the presence of hazardous substances or activity involving hazardous substances in violation of environmental laws on a property. The weighted-average interest rate on the mortgage notes payable as of March 31, 2016 was 4.9%.

During the three months ended March 31, 2016, we issued one long-term mortgage, collateralized by four properties, which is summarized below (dollars in thousands):

We made payments of $0.4 million and $0.2 million for deferred financing costs during the three months ended March 31, 2016 and 2015, respectively.

16

Table of Contents

Scheduled principal payments of mortgage notes payable for the remainder of 2016, and each of the five succeeding fiscal years and thereafter are as follows (dollars in thousands):

Interest Rate Cap

We have entered into interest rate cap agreements that cap the interest rate on certain of our notes payable when one-month LIBOR is in excess of 3.0%. We have adopted the fair value measurement provisions for our financial instruments recorded at fair value. The fair value guidance establishes a three-tier value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. Generally, we will estimate the fair value of our interest rate caps, in the absence of observable market data, using estimates of value including estimated remaining life, counterparty credit risk, current market yield and interest rate spreads of similar securities as of the measurement date. At March 31, 2016 and December 31, 2015, our interest rate cap agreements were valued using Level 2 inputs.

The fair value of the interest rate cap agreements is recorded in other assets on our accompanying consolidated balance sheets. We record changes in the fair value of the interest rate cap agreements quarterly based on the current market valuations at quarter end as interest expense on our accompanying consolidated statements of operations. The following table summarizes the key terms of each interest rate cap agreement (dollars in thousands):

The fair value of all mortgage notes payable outstanding as of March 31, 2016 was $454.5 million, as compared to the carrying value stated above, exclusive of premiums, discounts and deferred financing costs, of $455.3 million. The fair value is calculated based on a discounted cash flow analysis, using management’s estimate of market interest rates on long-term debt with comparable terms and loan to value ratios. The fair value was calculated using Level 3 inputs of the hierarchy established by ASC 820, “Fair Value Measurements and Disclosures.”

17

Table of Contents

Line of Credit and Term Loan Facility

In August 2013, we procured a senior unsecured revolving credit facility, or the Line of Credit, with KeyBank National Association (serving as a revolving lender, a letter of credit issuer and an administrative agent). On October 5, 2015, we expanded our Line of Credit to $85.0 million and extended the maturity date one-year through August 2018, with a one year extension option through August 2019. The interest rate on the line of credit was also reduced by 25 basis points at each of the leverage tiers and the total maximum commitment under the two facilities, including the Term Loan Facility discussed below, was increased from $100.0 million to $150.0 million. We also added three new lenders to the bank syndicate, which is now comprised of KeyBank, Comerica Bank, Fifth Third Bank, US Bank and Huntington Bank. We were subject to payment of $0.5 million for the modification of the agreement.

In connection with the Line of Credit expansion in October 2015 mentioned above, we added a $25.0 million, five year term loan facility, or the Term Loan Facility, which was fully drawn at closing and matures in October 2020. The Term Loan Facility is subject to the same leverage tiers as the Line of Credit; however the interest rate at each leverage tier is five basis points lower. We have the option to repay the Term Loan Facility in full, or in part, at any time without penalty or premium prior to the maturity date.

As of March 31, 2016, there was $68.1 million outstanding under our Line of Credit and Term Loan Facility at a weighted average interest rate of approximately 2.92% and $3.0 million outstanding under letters of credit at a weighted average interest rate of 2.5%. As of March 31, 2016, the maximum additional amount we could draw under the Line of Credit was $7.2 million. We were in compliance with all covenants under the Line of Credit and Term Loan Facility as of March 31, 2016.

The amount outstanding under the Line of Credit and Term Loan Facility approximates fair value as of March 31, 2016, as the debt is variable rate.

8. Mandatorily Redeemable Preferred Stock

In February 2012, we completed a public offering of 1,540,000 shares of 7.125% Series C Cumulative Term Preferred Stock, par value $0.001 per share, or the Term Preferred Stock, at a public offering price of $25.00 per share. Gross proceeds of the offering totaled $38.5 million and net proceeds, after deducting offering expenses borne by us, were $36.7 million. The Term Preferred Stock is traded under the ticker symbol GOODN on the NASDAQ Global Select Market, or the NASDAQ. The Term Preferred Stock is not convertible into our common stock or any other security of ours. As of January 31, 2016, we may redeem the shares at a redemption price of $25.00 per share, plus any accumulated and unpaid dividends to and including the date of redemption. The shares of the Term Preferred Stock have a mandatory redemption date of January 31, 2017. We incurred $1.8 million in total offering costs related to these transactions, which have been recorded net of the Series C mandatorily redeemable preferred stock on the condensed consolidated balance sheet and will be amortized over the redemption period ending January 31, 2017.

The Term Preferred Stock is recorded as a liability in accordance with ASC 480, “Distinguishing Liabilities from Equity,” which states that mandatorily redeemable financial instruments should be classified as liabilities and therefore the related dividend payments are treated as a component of interest expense in the condensed consolidated statements of operations.

The fair value of our Term Preferred Stock as of March 31, 2016, was $39.3 million, as compared to the carrying value stated above of $38.2 million, which includes $0.3 million of unamortized deferred financing costs. The fair value is calculated based on the closing share price as of March 31, 2016 of $25.50. The fair value was calculated using Level 1 inputs of the hierarchy established by ASC 820, “Fair Value Measurements and Disclosures.”

18

Table of Contents

9. Commitments and Contingencies

Ground Leases

We are obligated as lessee under four ground leases. Future minimum rental payments due under the terms of these leases as of March 31, 2016, are as follows (dollars in thousands):

Expenses recorded in connection to rental expense incurred for the properties listed above during the three months ended March 31, 2016 and 2015 were $0.1 million, respectively. Rental expenses are reflected in property operating expenses on the condensed consolidated statements of operations.

Letters of Credit

As of March 31, 2016, there were $3.0 million outstanding under letters of credit. These letters of credit are not reflected on our consolidated balance sheet.

10. Stockholders’ Equity

The following table summarizes the changes in our stockholders’ equity for the three months ended March 31, 2016 (dollars in thousands):

19

Table of Contents

Distributions

We paid the following distributions per share for the three months ended March 31, 2016 and 2015:

Recent Activity

Common Stock ATM Program

We sold 65,000 shares of common stock, raising an aggregate of $0.9 million in net proceeds under our previous ATM Program with Cantor Fitzgerald & Co., or Cantor Fitzgerald. In February 2016, we amended our common ATM program, or the Amended Common ATM, with Cantor Fitzgerald. The amendment increased the amount of shares of common stock that we may offer and sell through Cantor Fitzgerald, to $160.0 million. All other terms of the agreement remained unchanged. As of March 31, 2016, we had a remaining capacity to sell up to $160.0 million of common stock under the Amended Common ATM.

Preferred Stock ATM Program

Additionally, in February 2016 we entered into an open market sales agreement, or the Preferred ATM, with Cantor Fitzgerald, pursuant to which we may, from time to time, offer to sell (i) shares of our 7.75% Series A Cumulative Redeemable Preferred Stock, and (ii) shares of our 7.50% Series B Cumulative Redeemable Preferred Stock, having an aggregate offering price of up to $40.0 million, through Cantor Fitzgerald, acting as sales agent and/or principal. During the three months ended March 31, 2016, we sold 74,000 shares of our Series B Cumulative Redeemable Preferred Stock for net proceeds of $1.8 million. As of March 31, 2016, we had a remaining capacity to sell up to $38.2 million of preferred stock under the Preferred ATM.

11. Subsequent Events

On April 12, 2016, our Board of Directors declared the following monthly distributions for the months of April, May and June:

20

Table of Contents

On April 21, 2016, we repaid our $3.7 million mortgage on our Coppell, Texas property that was originally set to mature on June 1, 2016. We borrowed $9.5 million pursuant to a long-term note payable from Great Southern Bank to refinance the debt on our Coppell, Texas property and the note is also collateralized by our properties located in Allen, Texas and Colleyville, Texas, which were previously included in our unencumbered asset pool in our Line of Credit. The note accrues interest at LIBOR plus a margin of 2.75%, subject to an interest rate cap of 3.0%, and the loan has an original maturity date of April 22, 2019, with two, one-year extension options through April 22, 2021.

21

Table of Contents

All statements contained herein, other than historical facts, may constitute “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act. These statements may relate to, among other things, future events or our future performance or financial condition. In some cases, you can identify forward-looking statements by terminology such as “may,” “might,” “believe,” “will,” “provided,” “anticipate,” “future,” “could,” “growth,” “plan,” “intend,” “expect,” “should,” “would,” “if,” “seek,” “possible,” “potential,” “likely” or the negative of such terms or comparable terminology. These forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause our business, financial condition, liquidity, results of operations, funds from operations or prospects to be materially different from any future business, financial condition, liquidity, results of operations, funds from operations or prospects expressed or implied by such forward-looking statements. For further information about these and other factors that could affect our future results, please see the captions titled “Forward-Looking Statements” and “Risk Factors” in this report and in our Annual Report on Form 10-K for the year ended December 31, 2015. We caution readers not to place undue reliance on any such forward-looking statements, which are made pursuant to the Private Securities Litigation Reform Act of 1995 and, as such, speak only as of the date made. We undertake no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, after the date of this Quarterly Report on Form 10-Q.

All references to “we,” “our,” “us” and the “Company” in this Report mean Gladstone Commercial Corporation and its consolidated subsidiaries, except where the context indicates that the term means only Gladstone Commercial Corporation.

General

We are an externally-advised real estate investment trust, or REIT, that was incorporated under the General Corporation Law of the State of Maryland on February 14, 2003. We focus on acquiring, owning, and managing primarily office and industrial properties. On a selective basis, we may make long term industrial and commercial mortgage loans. Our properties are geographically diversified and our tenants cover a broad cross section of business sectors and range in size from small to very large private and public companies. We actively communicate with buyout funds, real estate brokers and other third parties to locate properties for potential acquisition or to provide mortgage financing in an effort to build our portfolio. We target secondary growth markets that possess favorable economic growth trends, diversified industries, and growing population and employment.

We have historically entered into, and intend in the future to enter into, purchase agreements for real estate having net leases with terms of approximately 7 to 15 years and built in rental rate increases. Under a net lease, the tenant is required to pay all operating, maintenance, repair and insurance costs and real estate taxes with respect to the leased property.

As of April 27, 2016:

22

Table of Contents

Business Environment

In the United States, vacancy rates have decreased for both office and industrial properties in most markets, as increased user demand has led to improved conditions. In fact, vacancy rates in many markets have been reduced to levels seen at the peak before the most recent recession and rental rates have increased in many primary and secondary markets. This condition has led to a rise in construction activity for both office and industrial properties in many markets; however, vacancy rates in certain secondary and tertiary markets are still higher than pre-recession levels as job growth has yet to return to all areas of the country even though the published unemployment rate has dropped over the past 12 months. Interest rates have been volatile since the beginning of the year and although interest rates are still relatively low, lenders have increased their required spreads and overall financing costs for fixed rate mortgages appear to be on the rise. The combined characteristics of lower vacancy rates, increased supply of capital from private and foreign buyers, and a potential rise in financing costs has led to increased competition for new acquisitions.

From a more macro-economic perspective, the strength of the global economy and U.S. economy in particular continue to be uncertain with increased volatility due to the recently disclosed oversupply of energy worldwide and an apparent global economic slowdown. In addition, the uncertainty surrounding the ability of the federal government to address its fiscal condition in both the near and long term as well as other geo-political issues has increased domestic and global instability. These developments could cause interest rates and borrowing costs to rise, which may adversely affect our ability to access both the equity and debt markets and could have an adverse effect on our tenants as well.

We continue to focus on re-leasing vacant space, renewing upcoming lease maturities and acquiring additional properties. Currently, we have two fully vacant buildings, one located in Newburyport, Massachusetts and one located in Dayton, Ohio, and a total of five partially vacant buildings. Our Newburyport, Massachusetts tenant vacated upon its lease termination in April 2015 and our Dayton, Ohio tenant vacated upon its lease termination in June 2015. Our Dayton, Ohio property has been classified as held for sale on our condensed consolidated balance sheet as of March 31, 2016 and we anticipate selling this property during the second quarter of 2016.

We have one expiring lease in 2016, which is 0.1% of rental income recognized during the three months ended March 31, 2016, seven expiring leases in 2017, which is 2.3% of rental income recognized during the three months ended March 31, 2016 and three expiring leases in 2018, which is 1.7% of rental income recognized during the three months ended March 31, 2016.

Our available vacant space at March 31, 2016 is 2.5% of our total square footage and the annual carrying costs on the vacant space, including real estate taxes and property operating expenses, are approximately $1.3 million. We continue to actively seek new tenants for these properties.

Our ability to make new investments is highly dependent upon our ability to procure external financing. Our principal sources of external financing generally include the issuance of equity securities, long-term mortgage loans secured by properties and borrowings under our line of credit, or the Line of Credit. While lenders’ credit standards have recently tightened, long-term mortgages are readily obtainable. We continue to look to regional banks and insurance companies, in addition to the collateralized mortgage backed securities, CMBS market to issue mortgages to finance our real estate activities.

In addition to obtaining funds through borrowing, we have been active in the equity markets during the three months ended March 31, 2016. We have issued shares of both common and preferred stock through our at-the-market programs, or ATM Programs, pursuant to our open market sale agreements with Cantor Fitzgerald & Co., or Cantor Fitzgerald, discussed in more detail below.

23

Table of Contents

Recent Developments

2016 Financing Activity

We issued two mortgages, which are summarized below (dollars in thousands):

2016 Leasing Activities

We have executed a lease on one property, which is summarized below (dollars in thousands):

2016 Equity Activities

Common Equity:

We sold 65,000 shares of common stock, raising an aggregate of $0.9 million in net proceeds under our previous ATM Program with Cantor Fitzgerald & Co., or Cantor Fitzgerald. In February 2016, we amended our common ATM program, or the Amended Common ATM, with Cantor Fitzgerald. The amendment increased the amount of shares of common stock that we may offer and sell through Cantor Fitzgerald, to $160.0 million. All other terms of the agreement remained unchanged. As of March 31, 2016, we had a remaining capacity to sell up to $160.0 million of common stock under the Amended Common ATM.

Preferred Equity: Additionally, in February 2016 we entered into an open market sales agreement, or the Preferred Stock ATM, with Cantor Fitzgerald, pursuant to which we may, from time to time, offer to sell (i) shares of our 7.75% Series A Cumulative Redeemable Preferred Stock, and (ii) shares of our 7.50% Series B Cumulative Redeemable Preferred Stock, having an aggregate offering price of up to $40.0 million, through Cantor Fitzgerald, acting as sales agent and/or principal. During the three months ended March 31, 2016, we sold 74,000 shares of our 7.50% Series B Cumulative Redeemable Preferred Stock for net proceeds of $1.8 million. As of March 31, 2016, we had a remaining capacity to sell up to $38.2 million of preferred stock under the Preferred Stock ATM.

24

Table of Contents

Diversity of Our Portfolio

Our Adviser seeks to diversify our portfolio to avoid dependence on any one particular tenant, industry or geographic market. By diversifying our portfolio, our Adviser intends to reduce the adverse effect on our portfolio of a single under-performing investment or a downturn in any particular industry or geographic market. For the three months ended March 31, 2016, our largest tenant comprised only 5.8% of total rental income. The table below reflects the breakdown of our total rental income by tenant industry classification for the three months ended March 31, 2016 and 2015, respectively (dollars in thousands):

The table below reflects the breakdown of total rental income by state for the three months ended March 31, 2016 and 2015, respectively (dollars in thousands):