SECOND AMENDMENT TO LEASE

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                                                                 Exhibit 10.13.2

                            SECOND AMENDMENT TO LEASE

         This Second Amendment to Lease dated as of the 31st day of May, 2000 by
and between Wellsford/Whitehall Holdings, L.L.C., a Delaware limited liability
company ("LANDLORD"), and MCK Communications, Inc., a Delaware corporation
("TENANT").

                                    RECITALS

         WHEREAS, Landlord and Tenant are parties to that certain Lease dated as
of January 12, 2000, as amended by that certain First Amendment to Lease dated
as of May 25th, 2000 (as amended, the "LEASE") with respect to space in the
building known and numbered as Xxxxxx Lake Corporate Center, 000 Xxxxxxxx
Xxxxxx, Xxxxxxx, Xxxxxxxxxxxxx (the "BUILDING"), which space consists of
approximately 48,886 rentable square feet, as more particularly described
therein (the "PREMISES");

         WHEREAS, the calculation of the rentable square footage of the Building
erroneously included the rentable square footage of the Cafeteria; and

         WHEREAS, Landlord and Tenant wish to amend the Lease to reflect the
accurate rentable square footage of the Building and the resulting recalculation
of Tenant's Share;

         NOW THEREFORE, in consideration of the mutual covenants herein
contained, and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereby agree to amend
the Lease deleting "twenty-three and 03/100 percent (23.03%), (calculated as
48,886/212,227)" in Section 1.2 and substituting in place thereof "twenty-three
and 11/100 percent (23.11%), (calculated as 48,886/211,555)."

         All capitalized terms used herein, and not otherwise defined herein,
shall have the meaning ascribed thereto in the Lease.

         Except as expressly amended herein, all other terms of the Lease remain
unchanged and the Lease is in all respects, confirmed, ratified and approved and
on the date of this Amendment, subject to the terms hereof, in full force and
effect.



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         IN WITNESS WHEREOF, Landlord and Tenant have duly executed this Second
Amendment to Lease under seal in one or more counterparts as of the day and year
first above written.


                                LANDLORD:

                                WELLSFORD/WHITEHALL HOLDINGS, L.L.C., a Delaware
                                limited liability company


                                By:  /s/ Xxxxxxx X. Xxxxxxx
                                    ----------------------------------
                                    Xxxxxxx X. Xxxxxxx
                                    Authorized Signatory



                                TENANT:

                                MCK COMMUNICATIONS, INC.,
                                a Delaware corporation


                                By:  /s/ Xxxx Xxxxx
                                    -------------------------------------------
                                    Xxxx Xxxxx
                                    Chief Financial Officer