Exhibit 1.1

AMENDMENT NO. 2 TO THE AT-THE-MARKET EQUITY OFFERING SALES AGREEMENT

August 12, 2025

BOFA SECURITIES, INC.

One Bryant Park

New York, New York 10036

GOLDMAN SACHS & CO. LLC

200 West Street

New York, New York 10282

HUNTINGTON SECURITIES, INC.

41 South High Street

Columbus, Ohio 43215

KEYBANC CAPITAL MARKETS INC.

127 Public Square, 7^th Floor

Cleveland, Ohio 44114

FIFTH THIRD SECURITIES, INC.

50 Rockefeller Plaza – Suite 1101

SU1600

New York, New York 10020

Ladies and Gentlemen:

Reference is made to the At-The-Market Equity Offering Sales Agreement, dated March 3, 2023, as amended on March 26, 2024, including the Schedules thereto (the “Original Agreement”), among BofA Securities, Inc., Goldman Sachs & Co. LLC, Robert W. Baird & Co. Incorporated, KeyBanc Capital Markets Inc., Fifth Third Securities, Inc. and Gladstone Commercial Corporation, a Maryland corporation (the “Company”) and Gladstone Commercial Limited Partnership, a Delaware limited partnership (the “Operating Partnership”), pursuant to which the Company agreed to sell through the Agents, shares of common stock, par value $0.001 per share, of the Company. All capitalized terms not defined herein shall have the meanings ascribed to them in the Original Agreement. The parties, intending to be legally bound, hereby amend the Original Agreement as follows:

1. All references to the “Prospectus Supplement”, with respect to sales to be made under the Registration Statement, refer to the prospectus supplement dated March 26, 2024, as supplemented and updated by the prospectus supplement to be dated August 12, 2025 (the “New Prospectus Supplement”).

2. All references to the “Prospectus”, with respect to sales to be made under the Registration Statement, refer to the Base Prospectus, as supplemented by the New Prospectus Supplement.

3. Section 11 of the Original Agreement shall remain unchanged, except that the notice information for Robert W. Baird & Co. Incorporated shall be removed and replaced with the below:

Huntington Securities, Inc.

41 South High Street

Columbus, OH 43215

Attention: Peter Dippolito / Equity Capital Markets

Emails: [email protected], [email protected]

Facsimile: (877) 807-4721

4. Schedule 2 of the Original Agreement shall remain unchanged, except that the Notice Parties for Robert W. Baird & Co. Incorporated shall be removed and replaced with the following:

Peter Dippolito ([email protected])

[email protected]

5. Pursuant to that certain termination notice, dated August 12, 2025, all references to “Robert W. Baird & Co. Incorporated” or “Baird” shall be removed from the Agreement and replaced with “Huntington Securities, Inc.” or “Huntington Capital Markets”.

6. The Company represents and warrants to, and agrees with the Agents that this Amendment has been duly authorized, executed and delivered by, and is a valid and binding agreement of, the Company, enforceable in accordance with its terms, except as rights to indemnification hereunder may be limited by applicable law and except as the enforcement hereof may be limited by bankruptcy, insolvency, reorganization, moratorium or other similar laws relating to or affecting the rights and remedies of creditors or by general equitable principles.

7. This Amendment together with the Original Agreement (including all schedules and exhibits attached hereto and thereto and Placement Notices issued pursuant hereto and thereto), constitutes the entire agreement and supersedes all other prior and contemporaneous agreements and undertakings, both written and oral, among the parties hereto with regard to the subject matter hereof. Neither this Amendment nor any term hereof may be amended except pursuant to a written instrument executed by the Company and the Agents. In the event that any one or more of the provisions contained herein, or the application thereof in any circumstance, is held invalid, illegal or unenforceable as written by a court of competent jurisdiction, then such provision shall be given full force and effect to the fullest possible extent that it is valid, legal and enforceable, and the remainder of the terms and provisions herein shall be construed as if such invalid, illegal or unenforceable term or provision was not contained herein, but only to the extent that giving effect to such provision and the remainder of the terms and provisions hereof shall be in accordance with the intent of the parties as reflected in this Amendment. All references in the Original Agreement to the “Agreement” shall mean, with respect to sales to be made under the New Registration Statement, the Original Agreement as amended by this Amendment; provided, however, that all references to “date of this Agreement” in the Original Agreement shall continue to refer to the date of the Original Agreement with respect to sales made under the Original Registration Statement.

8. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK WITHOUT REFERENCE TO ITS PRINCIPLES OF CONFLICTS OF LAW.

9. This Amendment may be executed by any one or more of the parties hereto in any number of counterparts, each of which shall be deemed to be an original, but such respective counterparts shall together shall constitute one and the same instrument, and may be delivered by facsimile transmission or by electronic delivery of a portable document format (PDF) file (including any electronic signature covered by the U.S. federal ESIGN Act of 2000, Uniform Electronic Transactions Act, the Electronic Signatures and Records Act or other applicable law, e.g., www.docusign.com). The invalidity or unenforceability of any section, paragraph or provision of this Amendment shall not affect the validity or enforceability of any other section, paragraph or provision hereof. If any section, paragraph or provision of this Amendment is for any reason determined to be invalid or unenforceable, there shall be deemed to be made such minor changes (and only such minor changes) as are necessary to make it valid and enforceable.

[Remainder of Page Intentionally Blank]

2

If the foregoing correctly sets forth the understanding among the Company and the Agents, please so indicate in the space provided below for that purpose, whereupon this letter shall constitute a binding amendment to the Original Agreement among the Company and the Agents.

[Signature Page to Amendment No. 2 to Sales Agreement]

[Signature Page to Amendment No. 2 to Sales Agreement]