Mich. Comp. Laws § 125.466

Sec. 66. Water-closets in cellars. No water-closet shall be maintained in the cellar of any dwelling without a permit in writing from the health officer, who shall have power to make rules and regulations governing the maintenance of such closets. Under no circumstances shall the general water-closet accommodations of any multiple dwelling be permitted in the cellar or basement thereof; this provision, however, shall not be construed so as to prohibit a general toilet room containing several water-closets, provided such water-closets are supplementary to those required by law.