We have acted as Maryland counsel to Service Properties Trust, a Maryland real estate investment trust (the “Company”), in connection with certain matters of Maryland law arising out of the sale and issuance of up to 479,166,667 common shares of beneficial interest (the “Shares”), $.01 par value per share of the Company (including up to 62,500,000 Shares which the underwriters in the offering (as defined below) have the option to purchase), in an underwritten public offering (the “Offering”) covered by the above-referenced Registration Statement, and all amendments thereto (collectively, the “Registration Statement”), filed by the Company with the United States Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as amended (the “Securities Act”). The Registration Statement contains a form of prospectus, dated August 19, 2024 (the “Base Prospectus”) in the form in which it was filed with the Commission pursuant to Rule 462(e) promulgated under the Securities Act, pertaining to the offer, issuance and sale of the securities registered thereby, including the Shares.

For purposes of rendering this opinion letter, we have examined originals or copies (certified or otherwise identified to our satisfaction) of the following documents:

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3.            the prospectus supplement, dated March 31, 2026, to the Base Prospectus in the form in which it was filed with the Commission pursuant to Rule 430B and Rule 424(b) promulgated under the Securities Act (the “Prospectus Supplement” and together with the Base Prospectus, the “Prospectus”);

4.            the underwriting agreement, dated as of March 31, 2026 (the “Underwriting Agreement”), by and between the Company and Yorkville Securities, LLC, as the representative of the several underwriters named on Schedule A thereto;

5.            a certified copy of the Amended and Restated Declaration of Trust of the Company filed with the State Department of Assessments and Taxation of Maryland (“SDAT”) on August 21, 1995 (the “Amended and Restated Declaration of Trust”);

6.            certified copies of the Articles of Amendment of the Company filed with SDAT on June 2, 1997, the Articles Supplementary of the Company filed with SDAT on June 2, 1997, the Articles Supplementary of the Company filed with SDAT on April 8, 1999, the Articles Supplementary of the Company filed with SDAT on May 16, 2000, the Articles Supplementary of the Company filed with SDAT on December 9, 2002, the Articles of Amendment of the Company filed with SDAT on May 24, 2006, the Articles Supplementary of the Company filed with SDAT on February 16, 2007, the Articles of Amendment of the Company filed with SDAT on March 5, 2007, the Articles Supplementary of the Company filed with SDAT on March 5, 2007, the Articles of Amendment of the Company filed with SDAT on May 16, 2007, the Articles of Amendment of the Company filed with SDAT on April 15, 2010, the Articles of Amendment filed with SDAT on January 18, 2012, the Articles Supplementary of the Company filed with SDAT on January 18, 2012, the Articles Supplementary of the Company filed with SDAT on June 10, 2014, the Articles of Amendment of the Company filed with SDAT on June 10, 2014, the Articles Supplementary of the Company filed with SDAT on April 20, 2017, the Articles of Amendment of the Company filed with SDAT on June 13, 2019, the Articles of Amendment of the Company filed with SDAT on September 20, 2019, the Articles Supplementary of the Company filed with SDAT on June 10, 2020, the Articles of Amendment of the Company filed with SDAT on June 10, 2020 and the Articles of Amendment of the Company filed with SDAT on March 30, 2026 (together with the Amended and Restated Declaration of Trust, the “SVC Charter”);

7.            a certified copy of the Third Amended and Restated Bylaws of the Company dated June 14, 2024 (the “SVC Bylaws”; together with the SVC Charter, the “SVC Organizational Documents”);

8.            a copy of the resolutions adopted by the board of trustees of the Company, or a duly authorized committee of the board of trustees of the Company (the “Board”), relating to, among other things, the registration, sale and issuance of the Shares (the “Resolutions”);

9.            an officer’s certificate of the Company as to, among other things, the authenticity and completeness of the SVC Organizational Documents, the Resolutions, and other matters that we have deemed necessary and appropriate (together with the SVC Organizational Documents and Resolutions, the “SVC Documents”); and

10.            a certificate of status of the Company from SDAT dated March 17, 2026 (the “Good Standing Certificate”).

The documents referenced above in items 1 through 4 are referred to herein as the “Transaction Documents”.

We have also examined such other certificates of public officials, such other certificates of officers of the Company and such other records, agreements, documents and instruments as we have deemed relevant and necessary as a basis for the opinions hereinafter set forth. Other than the foregoing and the documents listed in items 1 through 10 above, we have not reviewed any other documents. We have relied solely upon the foregoing documents, the statements and information set forth therein and the additional matters recited or assumed herein, all of which we have assumed to be true, complete and accurate in all material respects, and we have no reason to believe that the same are not true, complete and accurate in all material respects.

In such examination, we have assumed: (i) the genuineness of all signatures; (ii) the legal capacity of all natural persons; (iii) the authenticity and completeness of all documents submitted to us as originals; (iv) the conformity to original documents of all documents submitted to us as certified, conformed or other copies and the authenticity of the originals of such documents; (v) that all records and other information made available to us by the Company on which we have relied are complete in all material respects; (vi) that there has not been any mutual mistake of fact or misunderstanding, fraud, duress or undue influence; (vii) that the conduct of the parties has complied with the requirements of good faith, fair dealing and conscionability; (viii) that the representations, warranties, statements and information contained in the Transaction Documents and the Good Standing Certificate or other comparable documents from public officials dated prior to the date hereof are complete and accurate as of the date hereof; (ix) that all persons executing the Transaction Documents on behalf of any party (other than the Company) are duly authorized; (x) that each of the parties (other than the Company) has duly and validly executed and delivered the Transaction Documents and the party’s obligations are valid and legally binding obligations enforceable in accordance with the terms thereof; (xi) that the Transaction Documents accurately reflect the complete understanding of the parties with respect to the transactions contemplated by the Transaction Documents and the rights and obligations of the parties thereunder; and (xii) that the Shares will not be issued or transferred in violation of any restriction or limitation contained in Article V of the SVC Charter or Articles VIII and IX of the SVC Bylaws.

As to all questions of fact material to these opinions, we have relied solely upon the above-referenced certificates or comparable documents and upon the representations and warranties contained in the Transaction Documents and other documents delivered pursuant thereto, and the Good Standing Certificate, have not performed or had performed any independent research of public records and have assumed that certificates of or other comparable documents from public officials dated prior to the date hereof remain accurate as of the date hereof. Except as expressly set forth in this opinion letter, we have not undertaken any independent investigation, examination or inquiry to confirm or determine the existence or absence of facts, searched the books or records of the Company, searched any internal files, court files, public records, or other information, collected or examined or reviewed any communications, instruments, agreements, documents, financial statements or tax filings, minutes, records or liens.

Based on the foregoing, and subject to the assumptions and qualifications set forth herein, we are of the opinion that:

1.            The Company is a real estate investment trust that is validly existing and in good standing under the laws of the State of Maryland.

2.            The issuance of the Shares has been duly authorized by all necessary real estate investment trust action on the part of the Company and, when issued and fully paid for pursuant to the terms of the Resolutions and in accordance with the terms and conditions of the Registration Statement, the Prospectus and the Underwriting Agreement, the Shares will be validly issued, fully paid and nonassessable.

The foregoing opinions are limited to the laws of the State of Maryland and we do not express any opinion herein concerning federal law or the laws of any other state or jurisdiction. In delivering our opinion in paragraph 1 hereof regarding the valid existence and good standing of the Company, we have relied solely upon the Good Standing Certificate, and such opinion is limited to the date and meaning ascribed to such terms in such Good Standing Certificate by the respective public official that issued such Good Standing Certificate.

We express no opinion as to compliance with, or the applicability of, federal or state securities laws, including the securities laws of the State of Maryland, or federal or state laws regarding fraudulent transfers or any laws, ordinances, zoning restrictions, rules or regulations of any city, county or other municipality or any other local governmental agency, whether in the State of Maryland or any other jurisdiction.

The opinions expressed herein are rendered only as of the date hereof and are based on existing law, which is subject to change. Where our opinions expressed herein refer to events to occur at a future date, we have assumed that there will have been no changes in the relevant law or facts between the date hereof and such future date. We do not undertake to advise you of any changes in the opinions expressed herein from matters that may hereafter arise or be brought to our attention or to revise or supplement such opinions should the present laws of any jurisdiction be changed by legislative action, judicial decision or otherwise.

Our opinions expressed herein are limited to the matters expressly stated herein and no other opinion is implied or may be inferred beyond the matters expressly stated.

We hereby consent to the filing of this opinion with the Commission as Exhibit 5.1 to the Current Report on Form 8-K relating to the Offering to be filed by the Company on or about the date hereof, to the incorporation by reference of this opinion into the Registration Statement and the Prospectus, and to the reference to our firm therein and under the caption “Legal Matters” in the Prospectus. By giving such consent, we do not admit that we are “experts” within the meaning of Section 11 of the 1933 Act or within the category of persons whose consent is required under Section 7 of the 1933 Act.

	Very truly yours,

	/s/ Duane Morris LLP