410 ILCS 650/1
That every building, room, basement, inclosure or premises, occupied, used or maintained as a bakery, confectionery, cannery, packing house, slaughter house, creamery, cheese factory, restaurant, hotel, grocery, meat market, or as a factory, shop, warehouse, any public or place or manufacturing establishment used for the preparation, manufacture, packing, storage, sale or distribution of any food as defined by statute, which is intended for sale, shall be properly and adequately lighted, drained, plumbed and ventilated, and shall be conducted with strict regard to the influence of such conditions upon the health of the operatives, employees, clerks, or other persons therein employed, and the purity and wholesomeness of the food therein produced, prepared, manufactured, packed, stored, sold or distributed.
410 ILCS 650/1