Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

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

(i) Registration Statement (Form S-3 No. 333-208621) of SL Green Realty Corp. and in the related Prospectus;

(ii) Registration Statement (Form S-8 (No. 333-143721) pertaining to the Stock Option and Incentive Plans of SL Green Realty Corp., and

(iii) Registration Statement (Form S-8 No. 333-148973) pertaining to the 2008 Employee Stock Purchase Plan of SL Green Realty Corp.,

of our report dated March 22, 2016, with respect to the consolidated financial statements and schedules of Reckson Operating Partnership, L.P. included in this Annual Report (Form 10-K) for the year ended December 31, 2015.

/s/ Ernst & Young LLP

New York, New York

March 22, 2016