Mich. Comp. Laws § 211.214

Sec. 14. If an intermediate school district is located in 2 or more counties, the chairperson of the allocation board of the county in which the greatest part of the area of the intermediate school district is located, immediately upon the making of the final order approving a maximum tax rate for each local unit in the county, shall notify the chairpersons of the allocation boards of the counties in which other portions of the intermediate school district are located. The notice shall set forth the maximum tax rate approved by the allocation board for the purposes of the intermediate school district.