Mich. Comp. Laws § 120.102

Sec. 2. As used in this act: (a) "Authority" means a port authority created under this act and may also include the area within the jurisdiction of an authority. (b) "Constituent unit" means a city or county requesting the incorporation of an authority. (c) "Governing body of the city" means the city council or city commission of a city requesting incorporation of an authority created under this act. (d) "Governing body of the county" means the county board of commissioners of a county participating in an authority created under this act. (e) "Port facilities" means those facilities owned by the port authority such as: seawall jetties; piers; wharves; docks; boat landings; marinas; warehouses; storehouses; elevators; grain bins; cold storage plants; terminal icing plants; bunkers; oil tanks; ferries; canals; locks; bridges; tunnels; seaways; conveyors; modern appliances for the economical handling, storage, and transportation of freight and handling of passenger traffic; transfer and terminal facilities required for the efficient operation and development of ports and harbors; other harbor improvements; or improvements, enlargements, remodeling, or extensions of any of these buildings or structures. (f) "Project" means the acquisition, purchase, construction, reconstruction, rehabilitation, remodeling, improvement, enlargement, repair, condemnation, maintenance, or operation of port facilities.