Michigan Compiled Laws, Chapter 280. Drain Code of 1956 § 280.427

Sec. 427. In any application or petition required to be filed under this act, a freeholder shall be deemed to include a corporation owning land and a vendee under land contract, where such contract is of record in the office of the register of deeds of the county, or where the land is assessed in the name of the vendee on the tax assessment roll of the township or city. The authority of an officer or agent of a corporation to sign an application or petition on behalf of such corporation shall not be questioned, except by such corporation itself, after the application or petition has been accepted and passed on by a board of determination.