Claros Mortgage Trust (CMTG) POSASR Automatic shelf registration (post-effective amendment)

Exhibit 5.1

750 E. PRATT STREET SUITE 900 BALTIMORE, MD 21202 T 410.244.7400 F 410.244.7742 www.Venable.com

February 19, 2025

Claros Mortgage Trust, Inc.

c/o Mack Real Estate Credit Strategies, L.P.

60 Columbus Circle, 20^th Floor

New York, NY 10023

Re: Registration Statement on Form S-3 (File No. 333-269190)

Ladies and Gentlemen:

We have served as Maryland counsel to Claros Mortgage Trust, Inc., a Maryland corporation (the “Company”), in connection with certain matters of Maryland law arising out of the registration of (a) the following securities having an aggregate offering price of up to $250,000,000 (collectively, the “Securities”): (i) shares (the “Common Shares”) of common stock, $0.01 par value per share, of the Company; (ii) shares of preferred stock, $0.01 par value per share, of the Company (“Preferred Shares”); (iii) debt securities of the Company (“Debt Securities”); (iv) depositary shares (“Depositary Shares”) of the Company; (v) warrants (“Warrants”); (vi) purchase contracts (“Purchase Contracts”); and (vii) units (“Units”) consisting of two or more of the foregoing Securities, and (b) 16,058,983 Common Shares (the “Selling Stockholder Shares”) to be sold from time to time by the stockholders of the Company that may be indicated in a prospectus supplement (each, a “Selling Stockholder”), each covered by the Post-Effective Amendment No. 2 to the above-referenced Registration Statement on Form S-3, and all amendments thereto (the “Registration Statement”), as filed by the Company with the United States Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as amended (the “1933 Act”), on or about the date hereof.

In connection with our representation of the Company, and as a basis for the opinion hereinafter set forth, we have examined originals, or copies certified or otherwise identified to our satisfaction, of the following documents (hereinafter collectively referred to as the “Documents”):

1. The Registration Statement and the related form of prospectus included therein, in the form in which it was transmitted to the Commission under the 1933 Act;

2. The charter of the Company (the “Charter”), certified by the State Department of Assessments and Taxation of Maryland (the “SDAT”);

3. The Amended and Restated Bylaws of the Company (the “Bylaws”), certified as of the date hereof by an officer of the Company;

4. A certificate of the SDAT as to the good standing of the Company, dated as of a recent date;

Claros Mortgage Trust, Inc.

February 19, 2025

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5. Resolutions (the “Resolutions”) adopted by the Board of Directors of the Company (the “Board”) relating to the registration of the Securities, certified as of the date hereof by an officer of the Company;

6. A certificate executed by an officer of the Company, dated as of the date hereof; and

7. Such other documents and matters as we have deemed necessary or appropriate to express the opinion set forth below, subject to the assumptions, limitations and qualifications stated herein.

In expressing the opinion set forth below, we have assumed the following:

1. Each individual executing any of the Documents, whether on behalf of such individual or another person, is legally competent to do so.

2. Each individual executing any of the Documents on behalf of a party (other than the Company) is duly authorized to do so.

3. Each of the parties (other than the Company) executing any of the Documents has duly and validly executed and delivered each of the Documents to which such party is a signatory, and such party’s obligations set forth therein are legal, valid and binding and are enforceable in accordance with all stated terms.

4. All Documents submitted to us as originals are authentic. The form and content of all Documents submitted to us as unexecuted drafts do not differ in any respect relevant to this opinion from the form and content of such Documents as executed and delivered. All Documents submitted to us as certified or photostatic copies conform to the original documents. All signatures on all Documents are genuine. All public records reviewed or relied upon by us or on our behalf are true and complete. All representations, warranties, statements and information contained in the Documents are true and complete. There has been no oral or written modification of or amendment to any of the Documents, and there has been no waiver of any provision of any of the Documents, by action or omission of the parties or otherwise.

5. The issuance of, and certain terms of, the Securities to be issued by the Company from time to time will be authorized and approved by the Board, or a duly authorized committee thereof, in accordance with the Maryland General Corporation Law, the Charter, the Bylaws and the Resolutions (such approval referred to herein as the “Corporate Proceedings”).

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February 19, 2025

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6. Articles Supplementary creating and designating the number of shares and the terms of any class or series of Preferred Shares to be issued by the Company will be filed with and accepted for record by the SDAT prior to the issuance of such Preferred Shares.

7. Upon the issuance of any Securities that are Common Shares (“Common Securities”), including Common Securities which may be issued upon conversion or exercise of any other Securities convertible into or exercisable for Common Securities, the total number of Common Shares issued and outstanding will not exceed the total number of Common Shares that the Company is then authorized to issue under the Charter.

8. Upon the issuance of any Securities that are Preferred Shares (“Preferred Securities”), including Preferred Securities which may be issued upon conversion or exercise of any other Securities convertible into or exercisable for Preferred Securities, the total number of Preferred Shares issued and outstanding, and the total number of issued and outstanding shares of the applicable class or series of Preferred Shares designated pursuant to the Charter, will not exceed the total number of Preferred Shares or the number of shares of such class or series of Preferred Shares that the Company is then authorized to issue under the Charter.

9. The Securities and the Selling Stockholder Shares will not be issued or transferred in violation of any restriction or limitation contained in Article VII of the Charter or any comparable provision in the Articles Supplementary creating or designating any class or series of Preferred Shares.

10. Any Securities convertible or exchangeable for other Securities will be duly converted or exchanged in accordance with their terms.

Based upon the foregoing, and subject to the assumptions, limitations and qualifications stated herein, it is our opinion that:

1. The Company is a corporation duly incorporated and validly existing under and by virtue of the laws of the State of Maryland and is in good standing with the SDAT.

2. Upon the completion of all Corporate Proceedings relating to the Common Securities, the issuance of the Common Securities will be duly authorized and, when and if issued and delivered against payment therefor in accordance with the Registration Statement, the Resolutions and the Corporate Proceedings, the Common Securities will be validly issued, fully paid and nonassessable.

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February 19, 2025

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3. Upon the completion of all Corporate Proceedings relating to the Preferred Securities, the issuance of the Preferred Securities will be duly authorized and, when and if issued and delivered against payment therefor in accordance with the Registration Statement, the Resolutions and the Corporate Proceedings, the Preferred Securities will be validly issued, fully paid and nonassessable.

4. Upon the completion of all Corporate Proceedings relating to the Debt Securities, the issuance of the Debt Securities will be duly authorized.

5. Upon the completion of all Corporate Proceedings relating to the Warrants, the issuance of the Warrants will be duly authorized.

6. Upon the completion of all Corporate Proceedings relating to the Purchase Contracts, the issuance of the Purchase Contracts will be duly authorized.

7. Upon the completion of all Corporate Proceedings relating to the Units, the issuance of the Units will be duly authorized.

8. Upon the completion of all Corporate Proceedings relating to the Depositary Shares, the issuance of the Depositary Shares will be duly authorized.

9. The issuance of the Selling Stockholder Shares has been duly authorized and the Selling Stockholder Shares are validly issued, fully paid and nonassessable.

The foregoing opinion is 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. We express no opinion as to compliance with any federal or state securities laws, including the securities laws of the State of Maryland, or as to federal or state laws regarding fraudulent transfers. To the extent that any matter as to which our opinion is expressed herein would be governed by the laws of any jurisdiction other than the State of Maryland, we do not express any opinion on such matter. The opinion expressed herein is subject to the effect of any judicial decision which may permit the introduction of parol evidence to modify the terms or the interpretation of agreements.

The opinion expressed herein is limited to the matters specifically set forth herein and no other opinion shall be inferred beyond the matters expressly stated. We assume no obligation to supplement this opinion if any applicable law changes after the date hereof or if we become aware of any fact that might change the opinion expressed herein after the date hereof.

Claros Mortgage Trust, Inc.

February 19, 2025

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This opinion is being furnished to you for submission to the Commission as an exhibit to the Registration Statement. We hereby consent to the filing of this opinion as an exhibit to the Registration Statement and the said incorporation by reference and to the use of the name of our firm therein. In giving this consent, we do not admit that we are within the category of persons whose consent is required by Section 7 of the 1933 Act.

Very truly yours,

/s/ Venable LLP