Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the Registration Statements (i) on Form S-3 (Nos. 333-70111, 333-30394, 333-68828, 333‑62434, 333-126058, 333-179846, 333-185626 and 333-189355) of SL Green Realty Corp. and in the related Prospectuses; (ii) on Form S-8 (Nos. 333-61555, 333-87485, 333-89964, 333-127014, 333-143721 and 333-189362) pertaining to the Stock Option and Incentive Plans of SL Green Realty Corp., and (iii) on Form S-8 (No. 333-148973) pertaining to the 2008 Employee Stock Purchase Plan of SL Green Realty Corp., of our reports dated February 23, 2015, with respect to the consolidated financial statements and schedules of SL Green Realty Corp., and the effectiveness of internal control over financial reporting of SL Green Realty Corp., included in this Annual Report (Form 10-K) for the year ended December 31, 2014.

/s/ Ernst & Young LLP

New York, New York

February 23, 2015