
<PAGE>
                                                                    EXHIBIT 23.2

                        CONSENT OF INDEPENDENT AUDITORS

    We consent to the reference to our firm under the caption "Experts" in
Amendment No. 4 to the Registration Statement Form S-3 and related Prospectus of
SL Green Realty Corp. (the "Company") for the registration of 2,383,284 shares
of its common stock and to the incorporation by reference therein of our reports
(i) dated February 10, 1999, except for the last paragraph in Note 16, as to
which the date is March 12, 1999, with respect to the consolidated financial
statements and schedule of the Company for the year ended December 31, 1998 and
for the period August 21, 1997 (date of commencement of operations) to
December 31, 1997, (ii) dated February 10, 1998 with respect to the combined
financial statements of SL Green Predecessor for the period January 1, 1997 to
August 20, 1997 and for the year ended December 31, 1996 and (iii) dated
February 10, 1998 with respect to the combined financial statements of the
uncombined joint ventures of SL Green Predecessor for the period January 1, 1997
to August 20, 1997 and for the year ended December 31, 1996, included in its
Annual Report on Form 10-K of the Company for the year ended December 31, 1998,
filed with the Securities and Exchange Commission. We also consent to the use of
our reports (i) dated March 19, 1999 with respect to the statement of revenues
and certain expenses for the 555 West 57th property for the year ended
December 31, 1998, included in its Form 8-K/A, dated January 25, 1999 and filed
with the Securities and Exchange Commission on April 9, 1999, (ii) dated
August 3, 1999 with respect to the statement of revenues and certain expenses
for the Madison Properties for the year ended December 31, 1998, included in its
Form 8-K/A, dated May 24, 1999 and filed with the Securities and Exchange
Commission on August 6, 1999, and (iii) dated August 3, 1999 with respect to the
statement of revenues and certain expenses for the 90 Broad Street property for
the fiscal year ended April 30, 1999, included in its Form 8-K/A, dated May 24,
1999 and filed with the Securities and Exchange Commission on August 6, 1999.

                                          /s/ Ernst & Young LLP

New York, New York
January 10, 1000
