Mich. Comp. Laws § 125.523

Sec. 123. The governing body of a municipality to which this act by its terms applies, or the governing body of a municipality which adopts the provisions of this act by reference, shall designate a local officer or agency which shall administer the provisions of the act, and if no such officer or agency is designated then the local governing body shall be responsible for administration of the act. Municipalities may provide, by agreement, for the joint administration and enforcement of this act where such joint enforcement is practicable.