Exhibit 4.2

EXECUTION VERSION

SUPPLEMENTAL INDENTURE TO THE INDENTURES

Supplemental Indenture (this “Supplemental Indenture”), dated as of June 15, 2018, among  MGP OH, Inc.  (the “Guaranteeing Entity”), a Delaware corporation, MGP Finance Co-Issuer, Inc., a Delaware corporation (the “Co-Issuer”), MGM Growth Properties Operating Partnership LP, a Delaware limited partnership (the “Issuer” and, together with the Co-Issuer, the “Issuers”), the other Subsidiary Guarantors (as defined in the Indenture referred to herein) and U.S. Bank National Association, as Trustee under the Indenture referred to below (the “Trustee”).

W I T N E S S E T H

WHEREAS, the Issuers have heretofore executed and delivered to the Trustee (i) an indenture, dated as of April 20, 2016 providing for the issuance of 5.625% Senior Notes due 2024 (the “2024 Notes”); (ii) an indenture, dated as of August 12, 2016 providing for the issuance of 4.500% Senior Notes due 2026 (the “2026 Notes”); and (iii) an indenture, dated as of September 21, 2017 providing for the issuance of 4.500% Senior Notes due 2028 (the “2028 Notes,” and, collectively, with the 2024 Notes, and the 2026 Notes, the “Notes,” and each of (i), (ii) and (iii), the “Indentures”);

WHEREAS, the Indentures provide that under certain circumstances the Guaranteeing Entity shall execute and deliver to the Trustee a supplemental indenture pursuant to which the Guaranteeing Entity shall unconditionally guarantee all of the Issuers’ obligations under the Notes and the Indentures on the terms and conditions set forth herein (the “Note Guarantee”); and

WHEREAS, pursuant to Section 9.01 of the Indentures, the Trustee is authorized to execute and deliver this Supplemental Indenture.

NOW, THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the Guaranteeing Entity and the Trustee mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows:

1. CAPITALIZED TERMS. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indentures.

2. AGREEMENT TO GUARANTEE. The Guaranteeing Entity hereby agrees to provide an unconditional Guarantee on the terms and subject to the conditions set forth in each Note Guarantee and in the Indentures including but not limited to Article 10 thereof.

4. NO RECOURSE AGAINST OTHERS. No director, officer, employee, incorporator or stockholder of the Issuers or any Subsidiary Guarantor, as such, will have any liability for any obligations of the Company or the Subsidiary Guarantors under the Notes, the Indenture, the Note Guarantees or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder of Notes by accepting a Note waives and releases all such liability. The waiver and release are part of the consideration for issuance of the Notes. The waiver may not be effective to waive liabilities under the federal securities laws.

5. NEW YORK LAW TO GOVERN. THE INTERNAL LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED TO CONSTRUE THIS SUPPLEMENTAL INDENTURE WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY.

6. COUNTERPARTS. The parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement.

7. EFFECT OF HEADINGS. The Section headings herein are for convenience only and shall not affect the construction hereof.

8. THE TRUSTEE. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made solely by the Guaranteeing Entity and the Company.

[Signatures on following page]

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed and attested, all as of the date first above written.

Dated: June 15, 2018

[Signature Page to Supplemental Indenture]