Michigan Compiled Laws, Chapter 331. Hospitals § 331.1257

Sec. 257.  (1) The articles of incorporation of a corporation incorporated by a city or village may be amended by resolution approved by the affirmative vote of a majority of the members serving on the city council or village council.  The articles of incorporation of a subsidiary corporation of a corporation incorporated by a city or village may be amended by resolution approved by the affirmative vote of a majority of the trustees serving on the board of trustees of the parent corporation.

(2) The city clerk or village clerk shall file certified copies of any amendment to the articles of incorporation of a corporation or subsidiary corporation approved under subsection (1) in his or her office, with the secretary of state, and with the secretary of the corporation or subsidiary corporation.  The amendment is effective when filed with the secretary of state unless a later effective date is specified in the resolution adopting the amendment.  This subsection does not apply to an amendment to the articles of incorporation of a restructured corporation or a restructured subsidiary corporation.

(3) The articles of incorporation of a corporation or subsidiary corporation described in this section may be amended to include any provision that could be lawfully included in articles of incorporation initially adopted under this act at the time the amendment is approved, and may provide for the alteration or changing of the name, structure, organization, purposes, powers, programs, or activities of the corporation or subsidiary corporation.  However, an amendment shall not be effective to impair the obligation of a corporation obligation, bond, note, or contract.