Marcus & Millichap (MMI) 10-K 2018 FY Annual report

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the following Registration Statements:

(1) Registration Statement (FormS-3No. 333-224821) of Marcus & Millichap, Inc. Prospectus of Marcus & Millichap, Inc. for the registration of 2,000,000 shares of its common stock; and

(2) Registration Statements (FormS-8 Nos.333-192506 and333-216738) pertaining to the 2013 Omnibus Equity Incentive Plan and the 2013 Employee Stock Purchase Plan of Marcus & Millichap, Inc.;

of our reports dated March 1, 2019, with respect to the consolidated financial statements of Marcus & Millichap, Inc., and the effectiveness of internal control over financial reporting of Marcus & Millichap, Inc. included in this Annual Report (Form10-K) for the year ended December 31, 2018.

/s/ Ernst & Young LLP

Los Angeles, California

March 1, 2019