Re: Lease Agreement, dated October 2, 2007 (the "Lease") by and between Mercantile Bank of Michigan, a Michigan Banking Corporation (the "Tenant") and CD Partners L.L.C., a Michigan limited liability company ("Landlord") for premises located at 28350 Cabot Drive, Novi, Michigan (the "Premises").

EXHIBIT 10.6

May 21, 2009

Mr. Robert Worthington, Esq.
Senior Vice President
Mercantile Bank of Michigan
310 Leonard NW
Grand Rapids, Michigan 49504

Dear Bob:

     All capitalized terms in this letter (the “Lease Amendment”) which are not otherwise defined herein shall have the meanings ascribed to them in the Lease. Landlord and Tenant have negotiated an early termination of the Term of the Lease and accordingly agree that the Lease shall be and hereby is amended as follows, effective as of the date Tenant executes this Lease Amendment below (the “Effective Date”):

     1. Subject to the Tenant’s performance of its obligations hereunder, the Term of the Lease shall expire on 11:59 p.m., local time Detroit, Michigan on August 31, 2009 (the “Early Termination Date”). On the Early Termination Date, the Term of the Lease shall expire. All of Tenant’s options set forth in Lease, including the options to extend or contract the Term under Section 3 of the Lease and the option to purchase the Premises under Section 26 of the Lease, are hereby terminated. From the date hereof through the Early Termination Date, Tenant shall continue to perform all of its obligations under the Lease, other than the obligation to pay Monthly Installments of Base Rent, Real Estate Taxes and Building Expenses for the months of June, July and August, 2009.

     2. In consideration of the early termination of the Term of the Lease, Tenant shall pay Landlord the sum of $505,189.42 on or before June 1, 2009. Tenant’s failure to do so shall constitute an Event of Default of the Lease, there shall be no cure period and Landlord may immediately exercise all rights and remedies un