Exhibit 5.1

[Letterhead of]

CRAVATH, SWAINE & MOORE LLP

[New York Office]

March 10, 2017

Toll Brothers, Inc.

$300,000,000 4.875% Senior Notes due 2027

Ladies and Gentlemen:

We have acted as counsel to Toll Brothers, Inc., a Delaware corporation (the “Company”), and Toll Brothers Finance Corp., a Delaware corporation (the “Issuer”), in connection with the public offering and sale by the Issuer of $300,000,000 aggregate principal amount of 4.875% Senior Notes due 2027 (the “Senior Notes”) to be issued under the Indenture dated as of February 7, 2012 (the “Base Indenture”), by and among the Issuer, the Guarantors (as defined below) and The Bank of New York Mellon, as trustee (the “Trustee”), as supplemented by the authorizing resolution dated March 10, 2017 (the “Authorizing Resolution” and, together with the Base Indenture, the “Indenture”). The Senior Notes will be on the date hereof guaranteed (the “Guarantees”) by the entities set forth on Schedule I hereto (collectively, the “Delaware Guarantors”), by the entities set forth on Schedule II hereto (collectively, the “New York Guarantors” and, together with the Delaware Guarantors, the “Covered Guarantors”) and by the entities set forth on Schedule III hereto (the “Other Guarantors” and, together with the Covered Guarantors, the “Guarantors”).

In that connection, we have examined originals, or copies certified or otherwise identified to our satisfaction, of such documents, corporate records and other instruments as we have deemed necessary or appropriate for the purposes of this opinion, including: (a) the Certificate of Incorporation of the Issuer and the Company, as amended; (b) the By-laws of the Issuer and the Company, as amended; (c) the Omnibus Written Consent of (i) all of the members of the boards of directors of the corporations listed on Schedule I thereto and (ii) the person or persons authorized to act (whether directly, or indirectly

through a Guarantor) with regard thereto on behalf of one or more of the entities listed on Schedule II thereto, in each case duly adopted by unanimous consent on March 6, 2017; the Action Taken by Unanimous Written Consent of the Board of Directors of the Issuer, duly adopted on March 6, 2017; the Public Debt and Equity Securities Committee Charter of the Board of Directors of the Company, duly adopted on June 17, 2009; the resolutions of the Public Debt and Equity Securities Committee of the Company, duly adopted on March 6, 2017; the Action Taken by Unanimous Written Consent of a committee of the Board of Directors of the Company, duly adopted on March 7, 2017; the Pricing Resolutions of the Board of Directors of the Issuer, duly adopted on March 7, 2017; and the Joint Action of the Persons Authorized to Act on Behalf of each of the Issuer, the Company and the Guarantors duly adopted on March 10, 2017, pursuant to which the Authorizing Resolutions were adopted; (d) the Registration Statement on Form S-3 (Registration No. 333-202046) filed with the Securities and Exchange Commission (the “Commission”) on February 12, 2015, as amended by Post-Effective Amendment No. 1 thereto on October 27, 2015 and by Post-Effective Amendment No. 2 thereto on March 7, 2017(the “Registration Statement”), for registration under the Securities Act of 1933, as amended (the “Securities Act”), of an unlimited aggregate amount of various securities of the Company, the Issuer or certain other subsidiaries of the Company, to be issued from time to time by the Company, the Issuer or such subsidiaries; (e) the related Prospectus dated February 12, 2015 (together with the documents incorporated therein by reference, the “Basic Prospectus”); (f) the Prospectus Supplement dated March 7, 2017, filed with the Commission pursuant to Rule 424(b) of the General Rules and Regulations under the Securities Act (together with the Basic Prospectus and the documents incorporated by reference therein, the “Prospectus”); (g) the Pricing Term Sheet dated March 7, 2017, filed with the Commission pursuant to Rule 433 of the General Rules and Regulations under the Securities Act; (h) the Underwriting Agreement dated March 7, 2017(the “Underwriting Agreement”), among the Issuer, the Company and Citigroup Global Markets Inc., Deutsche Bank Securities Inc., Mizuho Securities USA Inc., SunTrust Robinson Humphrey, Inc. and Wells Fargo Securities, LLC, as representatives of the several underwriters names therein; and (i) the Indenture (including the First through Thirteenth Supplemental Indentures thereof) and the forms of the Senior Notes and Guarantees.

As to various questions of fact material to this opinion, we have relied upon representations of officers or directors of the Issuer and the Company and documents furnished to us by the Issuer and the Company without independent verification of their accuracy. We have also assumed (a) with your consent and without independent investigation or verification, the genuineness of all signatures, the legal capacity and competency of all natural persons, the authenticity of all documents submitted to us as originals and the conformity to authentic original documents of all documents submitted to us as duplicates or copies, (b) that the Indenture has been duly authorized, executed and delivered by, and represents a legal, valid and binding obligation of, the Trustee and (c) that the Guarantees have been duly authorized, executed and delivered by each of the Other Guarantors.

Based on the foregoing and subject to the qualifications set forth herein, we are of opinion that, when the Senior Notes are authenticated in accordance with the provisions

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of the Indenture and delivered and paid for, (i) the Senior Notes will constitute legal, valid and binding obligations of the Issuer, enforceable against the Issuer in accordance with their terms and entitled to the benefits of the Indenture (subject to applicable bankruptcy, insolvency, reorganization, moratorium, fraudulent transfer and other similar laws affecting creditors’ rights generally from time to time in effect and to general principles of equity, including, without limitation, concepts of materiality, reasonableness, good faith and fair dealing, regardless of whether considered in a proceeding in equity or at law) and (ii) the Guarantees will constitute legal, valid and binding obligations of the Guarantors entitled to the benefits of the Guarantees and enforceable against the Guarantors in accordance with their terms (subject to applicable bankruptcy, insolvency, reorganization, moratorium, fraudulent transfer and other similar laws affecting creditors’ rights generally from time to time in effect and to general principles of equity, including, without limitation, concepts of materiality, reasonableness, good faith and fair dealing, regardless of whether considered in a proceeding in equity or at law).

We are admitted to practice in the State of New York, and we express no opinion as to matters governed by any laws other than the laws of the State of New York, the Delaware General Corporation Law, the Delaware Revised Uniform Limited Partnership Act, the Delaware Limited Liability Company Act and the Federal laws of the United States of America.

We hereby consent to the filing of this opinion with the Commission as an exhibit to the Registration Statement. We also consent to the reference to our firm under the caption “Legal Matters” in the prospectus supplement forming a part of the Registration Statement. In giving this consent, we do not thereby admit that we are included in the category of persons whose consent is required under Section 7 of the Securities Act or the rules and regulations of the Commission.

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Schedule I – Delaware Guarantors

Schedule II – New York Guarantors

110-112 Third Ave. Realty Corp.

353-357 Broadway LLC

353-357 Broadway Member LLC

89 Park Avenue LLC

Toll at Whippoorwill, L.P.

Toll Brooklyn L.P.

Toll Land V Limited Partnership

Toll Land VI Limited Partnership

Toll Land VII LLC

Toll Lexington LLC

Toll NY II LLC

Toll NY III L.P.

Toll NY IV L.P.

Toll NY V L.P.

Toll NY L.P.

Toll Peppertree, Inc.

Toll Van Wyck, LLC

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Schedule III – Other Guarantors

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4

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Toll CA GP Corp.

Toll CA I LLC

Toll CA II, L.P.

Toll CA III LLC

Toll CA III, L.P.

Toll CA IV, L.P.

Toll CA IX, L.P.

Toll CA Note II LLC

Toll CA V, L.P.

Toll CA VI, L.P.

Toll CA VII, L.P.

Toll CA VIII, L.P.

Toll CA X, L.P.

Toll CA XI, L.P.

Toll CA XII, L.P.

Toll CA XIX, L.P.

Toll CA XX, L.P.

Toll CA, L.P.

Toll Land XIX Limited Partnership

Toll Land XX Limited Partnership

Toll Land XXII Limited Partnership

Toll Land XXIII Limited Partnership

Toll Stonebrae LP

Toll YL II, L.P.

Toll YL, Inc.

Toll-Dublin, L.P.

Toll-Dublin, LLC

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