Mich. Comp. Laws § 109.7

Sec. 7. The council may prescribe by ordinance, from time to time, limits of districts within the city within which wooden buildings and structures shall not be erected, placed, enlarged or repaired; and to direct the manner of constructing buildings within such districts, with respect to protection against fire and the material of which the outer walls and roofs shall be constructed. The council may provide by ordinance for proper fire escapes on buildings and compel the owners or occupants thereof to construct and maintain the same.