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                           RICHARDS, LAYTON & FINGER
                           A PROFESSIONAL ASSOCIATION
                               ONE RODNEY SQUARE
                                  P.O. BOX 551
                           WILMINGTON, DELAWARE 19899
                           TELEPHONE: (302) 658-6541
                           TELECOPIER: (302) 658-6548
                              WEBSITE: WWW.RLF.COM
                                                                     EXHIBIT 5.2

                                 August 2, 1999





MBWM Capital Trust I
216 North Division Avenue NW
Grand Rapids, MI 49503

         Re:      Mercantile Bank Corporation
                  MBWM Capital Trust I - Offering of Trust Preferred Securities

Ladies and Gentlemen:

              We have acted as special Delaware counsel for Mercantile Bank
Corporation, a Michigan corporation (the "Company"), and MBWM Capital Trust I, a
Delaware business trust (the "Trust"), in connection with the matters set forth
herein. At your request, this opinion is being furnished to you.

              For purposes of giving the opinions hereinafter set forth, our
examination of documents has been limited to the examination of originals or
copies of the following:

              (a) The Certificate of Trust of the Trust, dated as of July 23,
1999, as filed with the office of the Secretary of State of the State of
Delaware (the "Secretary of State") on July 26, 1999;

              (b) The Trust Agreement of the Trust, dated as of July 26,
1999 among the Company and the Trustees of the Trust named therein;

              (c) The Registration Statement (the "Registration Statement")
on Form SB-2, including a preliminary prospectus with respect to the Trust (the
"Prospectus"), relating to the Preferred Securities of the Trust representing
preferred undivided beneficial interests in the assets of the Trust (each, a
"Preferred Security" and collectively, the "Preferred Securities"), filed by the
Company and the Trust with the Securities and Exchange Commission on or about
August 2, 1999;


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MBWM Capital Trust I
August 2, 1999
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              (d) A form of Amended and Restated Trust Agreement for the
Trust, to be entered into among the Company, the Trustees of the Trust named
therein, and the holders, from time to time, of the undivided beneficial
interests in the assets of the Trust (including Exhibits C and E thereto) (the
"Trust Agreement"), attached as an exhibit to the Registration Statement; and

              (e) A Certificate of Good Standing for the Trust, dated August 2,
1999, obtained from the Secretary of State.

              Initially capitalized terms used herein and not otherwise defined
are used as defined in the Trust Agreement.

              For purposes of this opinion, we have not reviewed any documents
other than the documents listed in paragraphs (a) through (e) above. In
particular, we have not reviewed any document (other than the documents listed
in paragraphs (a) through (e) above) that is referred to in or incorporated by
reference into the documents reviewed by us. We have assumed that there exists
no provision in any document that we have not reviewed that is inconsistent with
the opinions stated herein. We have conducted no independent factual
investigation of our own but rather have relied solely upon the foregoing
documents, the statements and information set forth therein and the additional
matters recited or assumed herein, all of which we have assumed to be true,
complete and accurate in all material respects.

              With respect to all documents examined by us, we have assumed (i)
the authenticity of all documents submitted to us as authentic originals, (ii)
the conformity with the originals of all documents submitted to us as copies or
forms, and (iii) the genuineness of all signatures.

              For purposes of this opinion, we have assumed (i) that the Trust
Agreement and the Certificate of Trust are in full force and effect and have not
been amended, (ii) except to the extent provided in paragraph 1 below, the due
organization or due formation, as the case may be, and valid existence in good
standing of each party to the documents examined by us under the laws of the
jurisdiction governing its creation, organization or formation, (iii) the legal
capacity of natural persons who are parties to the documents examined by us,
(iv) that each of the parties to the documents examined by us has the power and
authority to execute and deliver, and to perform its obligations under, such
documents, (v) the due authorization, execution and delivery by all parties
thereto of all documents examined by us, (vi) the receipt by each Person to whom
a Preferred Security is to be issued by the Trust (collectively, the "Preferred
Security Holders") of a Preferred Securities Certificate for such Preferred
Security and the payment for such Preferred Security, in accordance with the
Trust Agreement and the Registration Statement, and (vii) that the Preferred
Securities are issued and sold to the Preferred Security Holders in accordance
with the Trust Agreement and the Registration Statement. We have not
participated in the preparation of the Registration Statement and assume no
responsibility for its contents.


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MBWM Capital Trust I
August 2, 1999
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              This opinion is limited to the laws of the State of Delaware, and
we have not considered and express no opinion on the laws of any other
jurisdiction, including federal laws and rules and regulations relating thereto.
Our opinions are rendered only with respect to Delaware laws and rules,
regulations and orders thereunder which are currently in effect.

              Based upon the foregoing, and upon our examination of such
questions of law and statutes of the State of Delaware as we have considered
necessary or appropriate, and subject to the assumptions, qualifications,
limitations and exceptions set forth herein, we are of the opinion that:

              1. The Trust has been duly created and is validly existing in
good standing as a business trust under the Delaware Business Trust Act.

              2. The Preferred Securities of the Trust will represent valid
and, subject to the qualifications set forth in paragraph 3 below, fully paid
and nonassessable undivided beneficial interests in the assets of the Trust.

              3. The Preferred Security Holders, as beneficial owners of the
Trust, will be entitled to the same limitation of personal liability extended to
stockholders of private corporations for profit organized under the General
Corporation Law of the State of Delaware. We note that the Preferred Security
Holders may be obligated to make payments as set forth in the Trust Agreement.

              We consent to the filing of this opinion with the Securities and
Exchange Commission as an exhibit to the Registration Statement. We hereby
consent to the use of our name under the heading "Legal Matters" in the
Prospectus. In giving the foregoing consents, we do not thereby admit that we
come within the category of persons whose consent is required under Section 7 of
the Securities Act of 1933, as amended, or the rules and regulations of the
Securities and Exchange Commission thereunder.

                                   Very truly yours,


                                        /s/ Richards, Layton & Finger
                                        ----------------------------


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