Mich. Comp. Laws § 110.6

Sec. 6. The council may also raise by tax in each street district for defraying the expenses of working upon, improving and repairing and cleaning the streets of the district and for all purposes for which the street district fund above mentioned is constituted, a sum not exceeding in any 1 year 1/4 of 1 per cent on the assessed value of the taxable real and personal property in the district.