GLADSTONE COMMERCIAL CORP (GOOD) Business

Item 1. Business.

Overview

Gladstone Commercial Corporation (which we refer to as “we,” “us,” or the “Company”) was incorporated under the General Corporation Law of the State of Maryland on February 14, 2003. We have elected to be taxed as a REIT for federal income tax purposes. We focus on acquiring, owning, and managing primarily industrial and office properties. Our shares of common stock, par value $0.001 per share, 6.625% Series E Cumulative Redeemable Preferred Stock, par value $0.001 per share (“Series E Preferred Stock”), and 6.00% Series G Cumulative Redeemable Preferred Stock, par value $0.001 per share (“Series G Preferred Stock”), trade on the Nasdaq Global Select Market (“Nasdaq”) under the trading symbols “GOOD,” “GOODN” and “GOODO,” respectively. Our senior common stock, par value $0.001 per share (“Senior Common Stock”) and our 6.00% Series F Cumulative Redeemable Preferred Stock, par value $0.001 per share (“Series F Preferred Stock”), are not listed or traded on any exchange or automated quotation system.

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, many of which are corporations that do not have publicly-rated debt. 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 seven to 20 years with built-in rental rate increases. Under a net lease, the tenant is required to pay most or all operating, maintenance, repair and insurance costs and real estate taxes with respect to the leased property.

We actively communicate with private equity 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.

As of February 18, 2026:

•we owned 151 properties totaling 17.7 million square feet (all references herein and throughout the Notes to Consolidated Financial Statements to the number of properties and square footage are unaudited) of rentable space, located in 27 states;

•our occupancy rate was 99.1%;

•the weighted average remaining term of our mortgage debt was 2.5 years, and the weighted average interest rate was 4.21%;

•the weighted average remaining term of our senior unsecured notes was 4.4 years, and the weighted average interest rate was 6.22%; and

•the average remaining lease term of the portfolio was 7.3 years.

We conduct substantially all of our business activities through an Umbrella Partnership Real Estate Investment Trust structure, by which all of our properties are held, directly or indirectly, by Gladstone Commercial Limited Partnership (the “Operating Partnership”). We control the sole general partner of the Operating Partnership and currently own, directly or indirectly, approximately 99.9% of the common units of limited partnership interest in the Operating Partnership (“OP Units”). We have in the past, and may in the future, issue OP Units in connection with the acquisition of commercial real estate, and thereby potentially expand the number of limited partners of the Operating Partnership. Limited partners who hold limited partnership units in our Operating Partnership for at least one year will generally be entitled to cause us to redeem these units for cash or, at our election, shares of our common stock on a one-for-one basis.

Our Operating Partnership is the sole member of Gladstone Commercial Lending, LLC (“Gladstone Commercial Lending”). Gladstone Commercial Lending is a Delaware limited liability company that was formed to hold any real estate mortgage loans.

Our business is managed by our external adviser, Gladstone Management Corporation (the “Adviser”). Gladstone Administration, LLC (the “Administrator”), provides administrative services to us. Both our Adviser and our Administrator are affiliates of ours and each other.

Our Investment Objectives and Our Strategy

Our principal investment objectives are to generate income from rental properties, which we use to fund our continuing operations and to pay monthly cash distributions to our stockholders. Our strategy is to invest in and own a diversified portfolio

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of leased properties (primarily industrial) that we believe will produce stable cash flow and increase in value. We may sell some of our real estate assets when our Adviser determines that doing so would be advantageous to us and our stockholders.

In addition to cash on hand and cash from operations, we use funds from various other sources to finance our acquisitions and operations, including equity, our Credit Facility, mortgage financing, long-term private debt, and other sources that may become available from time to time. We believe that moderate leverage is prudent and we aspire to reduce our leverage over time.

In addition to our use of leverage, we were active in the equity markets during 2025 by issuing shares of common stock under our common stock at-the-market program, pursuant to our current At-the-Market Equity Offering Sales Agreement (defined below as the 2024 Common Stock Sales Agreement). We also issued shares of our Series F Preferred Stock through bimonthly closings of this registered non-traded continuous offering. We did not sell any shares of our Series E Preferred Stock during the year ended December 31, 2025, as we terminated that program and the Common Stock Sales Agreement dated December 3, 2019, effective February 10, 2023, in connection with the expiration of our registration statement on Form S-3 (File No. 333-236143) (the “2020 Registration Statement”) on February 11, 2023.

On February 22, 2022, we entered into Amendment No. 1 to the At-the-Market Equity Offering Sales Agreement with sales agents Robert W. Baird & Co. Incorporated (“Baird”), Goldman Sachs & Co. LLC (“Goldman Sachs”), Stifel, Nicolaus & Company, Incorporated, (“Stifel”) BTIG, LLC (“BTIG”), and Fifth Third Securities, Inc. (“Fifth Third”), dated December 3, 2019 (together, the “Prior Common Stock Sales Agreement”). We terminated the Prior Common Stock Sales Agreement effective February 10, 2023 in connection with the expiration of our registration statement on Form S-3 (File No. 333-236143) (the “2020 Registration Statement”) on February 11, 2023.

On March 3, 2023, we entered into an At-the-Market Equity Offering Sales Agreement (the “2023 Common Stock Sales Agreement”), with BofA Securities, Inc. (“BofA”), Goldman Sachs, Baird, KeyBanc Capital Markets Inc. (“KeyBanc”), and Fifth Third (collectively the “Common Stock Sales Agents”). In connection with the 2023 Common Stock Sales Agreement, we filed prospectus supplements dated March 3, 2023 and March 7, 2023, to the prospectus dated November 23, 2022, with the SEC, for the offer and sale of an aggregate offering amount of $250.0 million of common stock.

On March 26, 2024, we entered into Amendment No. 1 to the 2023 Common Stock Sales Agreement (as amended from time to time, the “2024 Common Stock Sales Agreement”). The amendment permitted shares of common stock to be issued pursuant to the 2024 Common Stock Sales Agreement under our registration statement on Form S-3 (File No. 333-277877) (the “2024 Registration Statement”), and future registration statements on Form S-3. In connection with the 2024 Common Stock Sales Agreement, we filed a prospectus supplement with the SEC dated March 26, 2024, to the prospectus dated March 21, 2024, for the offer and sale of an aggregate offering amount of $250.0 million of common stock. On August 12, 2025, we entered into Amendment No. 2 (“Amendment No. 2”) to the 2024 Common Stock Sales Agreement which, among other things, (i) removed Baird as a Common Stock Sales Agent and (ii) added Huntington Securities, Inc. (“Huntington”) as a Common Stock Sales Agent. After giving effect to Amendment No. 2, the Common Stock Sales Agents are BofA, Goldman Sachs, KeyBanc, Fifth Third, and Huntington. In connection with Amendment No. 2, we filed a prospectus supplement with the SEC dated August 12, 2025, which updates and supplements the prospectus supplement dated March 26, 2024, for the offer and sale of an aggregate offering amount of $250.0 million of common stock under the 2024 Registration Statement. During the year ended December 31, 2025, we sold 4,412,814 shares of common stock, raising approximately $61.0 million, in net proceeds under the 2024 Common Stock Sales Agreement, as amended.

Investment Policies

Types of Investments

Overview

We intend to continue earning substantially all of our revenues from the ownership of income-producing real property. We expect that a majority of our investments will continue to be structured as net leases that require the tenant to pay most or all of the operating costs, costs of maintenance and repair, insurance and real estate taxes on the property. However, if a net lease would have an adverse impact on a potential tenant, or we assume a lease with a different existing structure in place, we may structure our investment as either a gross or modified gross lease. Investments are not restricted to geographical areas, but we expect that most of our investments in real estate will continue to be made within the continental United States. Some of our investments may also be made through joint ventures that would permit us to own interests in large properties without restricting the diversity of our portfolio.

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We anticipate that we will continue to make substantially all of our investments through our Operating Partnership. Our Operating Partnership may acquire interests in real property or mortgage loans in exchange for the issuance of common shares, OP Units, cash, or through a combination of the aforementioned. OP Units issued by our Operating Partnership generally will be redeemable for cash or, at our election, shares of our common stock on a one-for-one basis after the one-year anniversary of their issuance. We may in the future also conduct some of our business and hold some of our interests in real properties or mortgage loans through one or more wholly-owned subsidiaries that are not owned, directly or indirectly, through our Operating Partnership.

Property Acquisitions and Net Leasing

To date, we have purchased a majority of our properties from owners that have leased their properties to non-affiliated tenants, and while we have engaged in some transactions with tenants who have consummated sale-leaseback transactions, these transactions do not comprise the dominant portion of our portfolio. We expect that some of our sale-leaseback transactions will be in conjunction with acquisitions, recapitalizations or other corporate transactions affecting our tenants. In these transactions, we may act as one of several sources of financing by purchasing one or more properties from the tenant and by leasing it on a net basis to the tenant or its successor in interest.

Our portfolio consists primarily of single-tenant industrial and office real property. Our primary focus currently and going forward is single-tenant industrial properties, although we may continue to acquire select multi-tenant industrial properties. We may, from time to time, also acquire office properties, but this is not our primary focus. Generally, we lease properties to tenants that our Adviser deems creditworthy under leases that will be full recourse obligations of our tenants or their affiliates. We seek to obtain lease terms of approximately seven to 20 years with built-in rental increases.

We have formed relationships with nationally recognized strategic partners to assist us with the management of our properties in each of our markets. These relationships provide local expertise to ensure that our properties are properly maintained and that our tenants have local points of contact to address property issues. This strategy improves our operating efficiencies, increases local market intelligence for the Adviser, and generally does not increase our costs as the local property managers are reimbursed by the tenants in accordance with the lease agreements.

Underwriting Criteria, Due Diligence Process and Negotiating Lease Provisions

We consider underwriting of the real estate and the tenant for the property to be the two most important aspects of evaluating a prospective investment. In analyzing potential acquisitions of properties and leases, our Adviser reviews all aspects of the potential transaction, including tenant and real estate fundamentals, to determine whether potential acquisitions and leases can be structured to satisfy our acquisition criteria. The criteria listed below provide general guideposts that our Adviser may consider when underwriting leases and mortgage loans:

•Credit Evaluation. Our Adviser evaluates each potential tenant or borrower for its creditworthiness, considering factors such as its rating by a national credit rating agency, if any, management experience, industry position and fundamentals, operating history and capital structure. As of December 31, 2025, 35% of our lease revenues were earned from tenants that were rated by a nationally recognized statistical rating organization. A prospective tenant or borrower that is deemed creditworthy does not necessarily mean that we will consider its property to be “investment grade.” Our Adviser seeks tenants and borrowers that range from small businesses, many of which do not have publicly rated debt, to large public companies. Our Adviser’s investment professionals have substantial experience in locating and underwriting these types of companies. By leasing properties to these tenants, we believe that we will generally be able to charge rent that is higher than the rent charged to tenants with low leverage ratios and recognized credit, thereby enhancing current return from these properties as compared with properties leased to companies whose credit potential has already been recognized by the market. Furthermore, if a tenant’s credit improves, the value of our lease or investment will likely increase (if all other factors affecting value remain unchanged). In evaluating a possible investment, we believe that the creditworthiness of a prospective tenant can be a more significant factor than the unleased value of the property itself. While our Adviser selects tenants it believes to be creditworthy, tenants are not required to meet any minimum rating established by an independent credit rating agency. Our Adviser’s standards for determining whether a particular tenant is creditworthy vary in accordance with a variety of factors relating to specific prospective tenants. The creditworthiness of a tenant or borrower is determined on a tenant-by-tenant and case-by-case basis. Therefore, general standards for creditworthiness cannot be applied.

•Leases with Increasing Rent. Our Adviser seeks to acquire properties with leases that include a provision in each lease that provides for annual rent escalations over the term of the lease. A majority of our leases contain fixed rental

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escalations; however certain of our leases are tied to increases in indices, such as the consumer price index and we have a small number of leases without rental escalations.

•Diversification. Our Adviser attempts to diversify our portfolio to avoid dependence on any one particular tenant, facility type, geographic location or tenant industry. By diversifying our portfolio, our Adviser intends to reduce the adverse effect of a single under-performing investment or a downturn in any particular industry or geographic region. Please see Part I, Item 2, “Properties” of this Form 10-K for a summary of our portfolio by industry and geographic location.

•Property Valuation. The business prospects and the financial strength of the tenant are important aspects of the evaluation of any sale and leaseback of property, or acquisition of property subject to a net lease, particularly a property that is specifically suited to the needs of the tenant. We generally require quarterly unaudited and annual audited financial statements of the tenant to continuously monitor the financial performance of the tenant. Our Adviser evaluates the financial capability of the tenant and its ability to perform per the terms of the lease, including obtaining certificates of insurance and verifying payment of real estate taxes on an annual basis. Our Adviser will also examine the available operating results of prospective investment properties to determine whether or not projected rental levels are likely to be met. As further described below, our Adviser also evaluates the physical characteristics of a prospective property investment and comparable properties as well as the geographic location of the property in the particular market to ensure that the characteristics are favorable for re-leasing the property at approximately the same or higher rental rate should that necessity arise. Our Adviser then computes the value of the property based on historical and projected operating results. In addition, each property that we propose to purchase is appraised by an independent appraiser. These appraisals may take into consideration, among other things, the terms and conditions of the particular lease transaction and the conditions of the credit markets at the time the purchase is negotiated, as well as a value assessment of like properties in the market. We generally limit the purchase price of each acquisition to less than 5% of our consolidated total assets.

•Properties Important to Tenant Operations. Our Adviser generally seeks to acquire investment properties that are essential or important to the ongoing operations of the prospective tenant. We believe that these investment properties provide better protection in the event a tenant files bankruptcy, as leases on properties essential or important to the operations of a bankrupt tenant are typically less likely to be rejected in bankruptcy or otherwise terminated.

•Lease Provisions that Enhance and Protect Value. When appropriate, our Adviser attempts to acquire properties with leases that require our consent to specified tenant activity or require the tenant to satisfy specific operating tests. These provisions may include operational or financial covenants of the tenant, as well as indemnification of us by the tenant against environmental and other contingent liabilities. We believe that these provisions serve to protect our investments from changes in the operating and financial characteristics of a tenant that may impact its ability to satisfy its obligations to us or that could reduce the value of our properties. Our Adviser generally also seeks covenants requiring tenants to receive our consent prior to any change in control of the tenant.

•Credit Enhancement. Our Adviser may also seek to enhance the likelihood of a tenant’s lease obligations being satisfied through a cross-default with other tenant obligations, a letter of credit or a guaranty of lease obligations from the tenant’s corporate parent. We believe that this type of credit enhancement, if obtained, provides us with additional financial security.

Underwriting of the Real Estate and Due Diligence Process

In addition to underwriting the tenant or borrower, our Adviser also underwrites the real estate to be acquired or secured by one of our mortgages. On our behalf, our Adviser performs a due diligence review with respect to each property, such as evaluating the physical condition of a property, zoning and site requirements to ensure the property is in compliance with all zoning regulations as well as an environmental site assessment, in an attempt to determine potential environmental liabilities associated with a property prior to its acquisition, although there can be no assurance that hazardous substances or wastes (as defined by present or future federal or state laws or regulations) will not be discovered on the property after we acquire it. We could incur significant costs related to government regulation and private litigation over environmental matters. See “Risk Factors – We could be exposed to liability and remedial costs related to environmental matters.”

Our Adviser also reviews the structural soundness of the improvements on the property and may engage a structural engineer to review multiple aspects of the structures to determine the longevity of each building on the property. This review normally also includes the components of each building, such as the roof, the structure and configuration, the electrical wiring, the heating

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and air-conditioning system, the plumbing, parking lot and various other aspects such as compliance with state and federal building codes.

Our Adviser also physically inspects the real estate and surrounding real estate as part of determining its value. This aspect of our Adviser’s due diligence is aimed at arriving at a valuation of the real estate under the assumption that it would not be rented to the existing tenant. As part of this process, our Adviser may consider one or more of the following items:

•The comparable value of similar real estate in the same general area of the prospective property. In this regard, comparable property is difficult to define because each piece of real estate has its own distinct characteristics. But to the extent possible, comparable property in the area that has sold or is for sale will be used to determine if the price to be paid for the property is reasonable. The question of comparable properties’ sale prices is particularly relevant if a property might be sold by us at a later date.

•An assessment of the relative appropriate nature and flexibility of the building configuration and its ability to be re-leased to other users in a single or multiple tenant arrangement.

•The comparable real estate rental rates for similar properties in the same area of the prospective property.

•Alternative property uses that may offer higher value.

•The replacement cost of the property at current construction prices if it were to be sold.

•The assessed value as determined by the local real estate taxing authority.

In addition, our Adviser supplements its valuation with an independent real estate appraisal in connection with each investment that we consider. When appropriate, our Adviser may engage experts to undertake some or all of the due diligence efforts described above.

Use of Leverage

In addition to cash on hand and cash from operations, we use funds from various other sources to finance our acquisitions and operations, including common and preferred equity, our Credit Facility (defined below), mortgage financing, long-term private debt, and other sources that may become available from time to time. We believe that moderate leverage is prudent and we aspire to reduce our leverage over time.

Currently, the majority of our mortgage borrowings are structured as non-recourse to us, with limited exceptions that would trigger recourse to us only upon the occurrence of certain fraud, misconduct, environmental or bankruptcy events. The use of non-recourse financing allows us to limit our exposure to the amount of equity invested in the properties pledged as collateral for our borrowings. Non-recourse financing generally restricts a lender’s claim on the assets of the borrower, and as a result, the lender generally may look only to the property securing the debt for its satisfaction. We believe that this financing strategy, to the extent available, protects our other assets. However, we can provide no assurance that non-recourse financing will be available on terms acceptable to us, or at all, and consequently, there may be circumstances where lenders have recourse to our other assets. None of the $250.2 million in mortgage notes payable, net, outstanding as of December 31, 2025 have recourse to the Company.

On August 7, 2013, we procured a senior unsecured revolving credit facility (“Revolver”), with KeyBank National Association (“KeyBank”) (serving as a revolving lender, a letter of credit issuer and an administrative agent) for $60.0 million. On October 5, 2015, we added a $25.0 million five-year term loan facility (“Term Loan A”). On February 11, 2021, we added a new $65.0 million term loan component, inclusive of a $15.0 million delayed funding component which was funded on July 20, 2021 (“Term Loan B”). On August 18, 2022, we added a new $140.0 million term loan facility component (“Term Loan C”). The Credit Facility’s bank syndicate was then comprised of KeyBank, Fifth Third Bank, The Huntington National Bank, Bank of America, Synovus Bank, United Bank, First Financial Bank, and S&T Bank. We refer to Term Loan A, Term Loan B, Term Loan C and the Revolver, collectively, herein as the Credit Facility.

On May 30, 2025, the Operating Partnership entered into a Term Loan Agreement with KeyBank in connection with the $20.0 million Term Loan D (“Term Loan D”). Term Loan D was unsecured and had a maturity date of May 30, 2027 and a SOFR spread ranging from 155 to 200 basis points throughout the life of the loan. The proceeds from Term Loan D were used to pay down the Revolver.

On September 18, 2025, we amended our Credit Facility, increasing our Revolver from $125.0 million to $155.0 million. We incurred fees of approximately $0.5 million in connection with the increase to our Credit Facility. The increased credit availability was used, in part, to fund a nine-property portfolio acquisition that closed on September 30, 2025.

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On October 10, 2025, we amended, extended, and upsized our Credit Facility, increasing our Revolver from $155.0 million to $200.0 million (and its term to October 2029), decreasing the principal balance of Term Loan A from $160.0 million to $125.0 million (and extending its term to October 2029), increasing the principal balance of Term Loan B from $60.0 million to $143.3 million (and its term to February 2030), decreasing the principal balance of Term Loan C from $150.0 million to $131.7 million, and repaying the full principal balance of Term Loan D. The SOFR spread increased by 10 basis points, ranging from 140 to 210 basis points for the Revolver and 135 to 205 basis points for the Term Loans, depending on our leverage. We incurred fees of approximately $4.2 million in connection with amending, extending, and upsizing our Credit Facility. The Credit Facility’s new (and current) bank syndicate is comprised of KeyBank, Fifth Third Bank, The Huntington National Bank, Bank of America, Synovus Bank, PNC Bank, National Association (“PNC Bank”), Webster Bank, National Association (“Webster Bank”), and S&T Bank. As of December 31, 2025, there was $437.4 million outstanding under our Credit Facility at a weighted average interest rate of approximately 5.42% and $2.1 million of outstanding letters of credit.

On December 15, 2025, we and the Operating Partnership entered into a Note Purchase Agreement with the institutional investors named therein, in connection with a private placement of $85.0 million of 5.99% senior unsecured notes, maturing on December 15, 2030 (the “2030 Notes”).

Conflict of Interest Policy

We have adopted policies to reduce potential conflicts of interest. In addition, our directors are subject to certain provisions of Maryland law that are designed to minimize conflicts. However, we cannot provide assurance that these policies or provisions of law will reduce or eliminate the influence of these conflicts.

Under our current conflict of interest policy, without the approval of a majority of our independent directors, we will not:

•acquire from or sell any assets or other property to any of our officers, directors or our Adviser’s employees, or any entity in which any of our officers, directors or Adviser’s employees has an interest of more than 5%;

•borrow from any of our directors, officers or our Adviser’s employees, or any entity, in which any of our officers, directors or our Adviser’s employees has an interest of more than 5%; or

•engage in any other transaction with any of our directors, officers or our Adviser’s employees, or any entity in which any of our directors, officers or our Adviser’s employees has an interest of more than 5% (except that our Adviser may lease office space in a building that we own, provided that the rental rate under the lease is determined by our independent directors to be at a fair market rate).

Our policy also prohibits us from purchasing any real property owned by or co-investing with our Adviser, any of its affiliates or any business in which our Adviser or any of its subsidiaries have invested, except that we may lease property to existing and prospective portfolio companies of current or future affiliates, such as our affiliated publicly-traded funds Gladstone Capital Corporation (“Gladstone Capital”), Gladstone Land Corporation (“Gladstone Land”), Gladstone Investment Corporation (“Gladstone Investment”), or Gladstone Alternative Income Fund (“Gladstone Alternative”), and other entities advised by our Adviser, so long as that entity does not control the portfolio company and the transaction is approved by both companies’ board of directors. If we decide to change this policy on co-investments with our Adviser or its affiliates, we will seek our stockholders’ approval.

Future Revisions in Policies and Strategies

Our independent directors periodically review our investment policies to evaluate whether they are in the best interests of us and our stockholders. Our investment procedures, objectives and policies may vary as new investment techniques are developed or as regulatory requirements change, and except as otherwise provided in our charter or bylaws, may be altered by a majority of our directors (including a majority of our independent directors) without the approval of our stockholders, to the extent that our Board of Directors determines that such modification is in the best interest of our stockholders. Among other factors, developments in the market which affect the policies and strategies described in this report or which change our assessment of the market may cause our Board of Directors to revise our investment policies and strategies.

Code of Ethics

We have adopted a code of ethics and business conduct (a “Code of Ethics”) applicable to all personnel of our Adviser and Administrator performing services on our behalf that complies with the guidelines set forth in Item 406 of Regulation S-K of the Securities Act of 1933. This code establishes procedures for personal investments, restricts certain transactions by such personnel and requires the reporting of certain transactions and holdings by such personnel. A copy of this code is available for review, free of charge, on the investors section of our website at www.GladstoneCommercial.com. The information contained

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on or connected to our website is not incorporated by reference into this Form 10-K and should not be considered part of this or any other report that we file with or furnish to the SEC. We intend to provide any required disclosure of any amendments to or waivers of this code of ethics by posting information regarding any such amendment or waiver to our website.

Our Adviser and Administrator

Our business is managed by our Adviser. The officers, directors and employees of our Adviser have significant experience in making investments in and lending to businesses of all sizes, and investing in real estate. We have entered into an investment advisory agreement with our Adviser, as amended from time to time (including the Seventh Amended and Restated Investment Advisory Agreement dated January 10, 2023 and the Eighth Amended and Restated Investment Advisory Agreement dated July 11, 2023, the “Advisory Agreement”), under which our Adviser is responsible for managing our assets and liabilities, for operating our business on a day-to-day basis and for identifying, evaluating, negotiating and consummating investment transactions consistent with our investment policies as determined by our Board of Directors from time to time. The Administrator employs our chief financial officer, treasurer, chief compliance officer, and co-general counsels and co-secretaries (one of whom also serves as our Administrator’s president, general counsel, and secretary) and their respective staffs and provides administrative services for us under the administration agreement with our Administrator (the “Administration Agreement”).

David Gladstone, our chairman and chief executive officer, is also the chairman, chief executive officer and the controlling stockholder of our Adviser and our Administrator. Arthur “Buzz” Cooper, our president, is also an Executive Vice President of our Adviser.

Our Adviser has an investment committee that approves each of our investments. This investment committee is currently comprised of Messrs. Gladstone and Cooper, Laura Gladstone, who is an Executive Vice President of our Adviser, and John Sateri, who is also an Executive Vice President of our Adviser and President of Gladstone Alternative. We believe that the review process of our investment committee gives us a competitive advantage over other REITs because of the substantial experience that its members possess and their unique perspective in evaluating the blend of corporate credit, real estate and lease terms that collectively provide an acceptable risk for our investments.

Our Adviser’s board of directors has empowered our investment committee to authorize and approve our investments, subject to the terms of the Advisory Agreement. Before we acquire any property, the transaction is reviewed by our investment committee to ensure that, in its view, the proposed transaction satisfies our investment criteria and is within our investment policies. Approval by our investment committee is generally the final step in the property acquisition approval process, although the separate approval of our Board of Directors is required in certain circumstances described below. For further detail on this process, please see “Investment Policies—Underwriting Criteria, Due Diligence Process and Negotiating Lease Provisions.”

Our Adviser and Administrator are headquartered in McLean, Virginia, a suburb of Washington, D.C., and our Adviser also has offices in other states. Refer to Part II, Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations - Advisory and Administration Agreements” of this Form 10-K for a detailed discussion on the Adviser and Administrator’s fee structure.

Adviser Duties and Authority under the Advisory Agreement

Under the terms of the Advisory Agreement, our Adviser is required to use its best efforts to present to us investment opportunities consistent with our investment policies and objectives as adopted by our Board of Directors. In performing its duties, our Adviser, either directly or indirectly by engaging an affiliate:

•finds, evaluates and enters into contracts to purchase real estate on our behalf in compliance with our investment procedures, objectives and policies, subject to approval of our Board of Directors, where required;

•provides advice to us and acts on our behalf with respect to the negotiation, acquisition, financing, refinancing, holding, leasing and disposition of real estate investments;

•takes the actions and obtains the services necessary to effect the negotiation, acquisition, financing, refinancing, holding, leasing and disposition of real estate investments; and

•provides day-to-day management of our business activities and other administrative services for us as requested by our Board of Directors.

Our Board of Directors has authorized our Adviser to make investments in any property on our behalf without the prior approval of our Board of Directors if the following conditions are satisfied:

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•our Adviser has obtained an independent appraisal for the property indicating that the total cost of the property does not exceed its appraised value; and

•our Adviser has concluded that the property, in conjunction with our other investments and proposed investments, is reasonably expected to fulfill our investment objectives and policies as established by our Board of Directors then in effect.

The actual terms and conditions of transactions involving investments in properties are determined at the sole discretion of our Adviser, subject at all times to compliance with the foregoing requirements. However, some types of transactions, including the following, require the prior approval of our Board of Directors, including a majority of our independent directors:

•loans not secured or otherwise supported by real property;

•any acquisition which at the time of investment would have a cost exceeding 20% of our total assets;

•transactions that involve conflicts of interest with our Adviser or other affiliates (other than reimbursement of expenses in accordance with the Advisory Agreement); and

•the lease of assets to our Adviser, its affiliates or any of our officers or directors.

Our Adviser and Administrator also engage in other business ventures and, as a result, their resources are not dedicated exclusively to our business. For example, our Adviser and Administrator also serve as the external adviser or administrator, respectively, to Gladstone Capital and Gladstone Investment, both publicly traded business development companies affiliated with us, Gladstone Land, a publicly traded agricultural REIT that is also our affiliate, and Gladstone Alternative, a non-diversified, closed-end management investment company that operates as an “interval fund” that is also our affiliate. However, under the Advisory Agreement, our Adviser is required to devote sufficient resources to the administration of our affairs to discharge its obligations under the agreement. The Advisory Agreement is not assignable or transferable by either us or our Adviser without the consent of the other party, except that our Adviser may assign the Advisory Agreement to an affiliate for whom our Adviser agrees to guarantee its obligations to us.

Gladstone Securities

Gladstone Securities, LLC (“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 controlled by David Gladstone, our chairman and chief executive officer. Mr. Gladstone also serves on the board of managers of Gladstone Securities.

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 third party lenders to us 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, will be 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. The agreement is scheduled to terminate on August 31, 2026, unless renewed and approved by our Board of Directors or earlier terminated.

Dealer Manager Agreement

On February 20, 2020 we entered into a dealer manager agreement, as amended on February 9, 2023 (together, the “Dealer Manager Agreement”), whereby Gladstone Securities acted as the exclusive dealer manager in connection with our offering (the “Offering”) of up to (i) 20,000,000 shares of our Series F Preferred Stock on a “reasonable best efforts” basis (the “Primary Offering”), and (ii) 6,000,000 shares of Series F Preferred Stock pursuant to our distribution reinvestment plan (the “DRIP”) to those holders of the Series F Preferred Stock who participated in such DRIP. The Series F Preferred Stock was previously registered with the SEC pursuant to a registration statement on Form S-3 (File No. 333-268549), as the same may be amended and/or supplemented (the “2022 Registration Statement”), under the Securities Act, and were offered and sold pursuant to a prospectus supplement, dated February 9, 2023, and a base prospectus dated November 23, 2022 relating to the 2022 Registration Statement. The Series F Preferred Stock is currently registered with the SEC pursuant to a registration statement on Form S-3 (File No. 333-277877), as the same may be amended and/or supplemented (the “2024 Registration Statement”), under

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the Securities Act, and was offered and sold pursuant to a prospectus supplement dated May 1, 2024, and a base prospectus dated March 21, 2024 relating to the 2024 Registration Statement (the “Prospectus”). During the years ended December 31, 2023, and 2024, the Series F Preferred Stock was registered with the SEC pursuant to the 2022 Registration Statement, and offered and sold pursuant to a prospectus supplement, dated February 9, 2023, and a base prospectus dated November 23, 2022. During the year ended December 31, 2025, the Series F Preferred Stock was registered with the SEC pursuant to the 2024 Registration Statement, and offered and sold pursuant to a prospectus supplement, dated May 1, 2024, and a base prospectus dated March 21, 2024.

Under the Dealer Manager Agreement, Gladstone Securities, as dealer manager, provided certain sales, promotional and marketing services to the Company in connection with the Offering, and the Company paid Gladstone Securities (i) selling commissions of 6.0% of the gross proceeds from sales of Series F Preferred Stock in the Primary Offering (the “Selling Commissions”), and (ii) a dealer manager fee of 3.0% of the gross proceeds from sales of Series F Preferred Stock in the Primary Offering (the “Dealer Manager Fee”). No Selling Commissions or Dealer Manager Fees were paid with respect to Shares sold pursuant to the DRIP. Gladstone Securities had the sole discretion to reallow a portion of the Dealer Manager Fee to participating broker-dealers in support of the Offering.

Human Capital Management

We do not currently have any employees and do not expect to have any employees in the foreseeable future. Currently, services necessary for our business are provided by individuals who are employees of our Adviser and our Administrator pursuant to the terms of the Advisory Agreement and the Administration Agreement, respectively. Each of our executive officers is an employee or officer, or both, of our Adviser or our Administrator. We expect that a total of 15 to 20 full time employees of our Adviser and our Administrator will spend substantially all or all of their time on our matters during calendar year 2026. Our president and CFO, accounting team, and the employees of our Adviser that manage our assets and our investments spend all of their time on our matters. To the extent that we acquire more investments, we anticipate that the number of employees of our Adviser and our Administrator who devote time to our matters will increase.

As of December 31, 2025, our Adviser and Administrator collectively had 75 full-time employees. A breakdown of these employees is summarized by functional area in the table below:

The Adviser and the Administrator aim to attract and retain capable advisory and administrative personnel, respectively, by offering competitive base salaries, benefits and bonus structure and by providing employees with appropriate opportunities for professional development and growth.

Competition

We compete with a number of other real estate investment companies and traditional mortgage lenders, many of whom have greater marketing and financial resources than we do. Principal factors of competition in our primary business of investing in and owning leased industrial and office real property are the quality of properties, leasing terms, attractiveness and convenience of location. Additionally, our ability to compete depends upon, among other factors, trends of the national and local economies, investment alternatives, financial condition and operating results of current and prospective tenants and borrowers, availability and cost of capital, taxes and governmental regulations.

Government Regulations

We must own, operate, manage, acquire and develop our properties in compliance with the laws and regulations of the United States, as well as state and local laws and regulations in the markets where our properties are located, which may differ among jurisdictions. In response to public health emergencies, federal governmental authorities, as well as state and local governmental authorities in jurisdictions where our properties are located, have in recent years implemented laws and regulations which impacted our ability to operate our business in the ordinary course. These governmental authorities may take similar actions in the future in the event of new public health emergencies. Such regulations may materially affect our results of operations for the year ending December 31, 2026. Otherwise, we do not expect that compliance with the various laws and regulations we are

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subject to will have a material effect on our capital expenditures, results of operations and competitive position for the year ending December 31, 2026, as compared to prior periods.

For additional information, see “Risk Factors - We could incur significant costs related to government regulation and private litigation over environmental matters.”, “Risk Factors - Compliance or failure to comply with laws requiring access to our properties by disabled persons could result in substantial cost.”, and “Risk Factors – We could be exposed to liability and remedial costs related to environmental matters.”

Available Information

Copies of our annual report on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, proxy statements and amendments, if any, to those reports filed or furnished with the SEC, pursuant to Section 13(a) or 15(d) of the Securities Exchange Act are available free of charge through the investors section of our website at www.GladstoneCommercial.com as soon as practicable after such reports have been filed or furnished to the SEC. Information on our website should not be considered part of this Form 10-K. A request for any of these reports may also be submitted to us by sending a written request addressed to Investor Relations, Gladstone Commercial Corporation, 1521 Westbranch Drive, Suite 100, McLean, VA 22102, or by calling our toll-free investor relations line at 1-866-366-5745. The SEC also maintains a website that contains reports, proxy and information statements, and other information regarding issuers that file electronically with the SEC at www.sec.gov.