Mich. Comp. Laws § 81.15: Fourth class city; bodies corporate.

Sec. 15.

All cities organized under or made subject to the provisions of this act shall be bodies politic and corporate under and by the name assumed by them in their declaration of incorporation, or designated in their acts of incorporation; and by such name may sue and be sued, contract and be contracted with, acquire and hold real and personal property for the purposes for which they are incorporated, have a common seal and change the same at pleasure, and exercise all the powers in this act conferred.