Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the reference to our firm under the caption “Experts” in the Registration Statement (Form S-3) and related Prospectus of SL Green Realty Corp. for the registration of common stock and to the incorporation by reference therein of our reports dated February 28, 2007 with respect to the consolidated financial statements and schedule of SL Green Realty Corp., SL Green Realty Corp. management’s assessment of the effectiveness of internal control over financial reporting, and the effectiveness of internal control over financial reporting of SL Green Realty Corp. included in its Annual Report (Form 10-K) for the year ended December 31, 2006, filed with the Securities and Exchange Commission.

/s/ Ernst & Young LLP

New York, New York
June 20, 2007