All uses in an I-L zone, except sales yards, service yards, storage yards and loading and equipment rental, shall be conducted entirely within an enclosed building. (Ord. 3153 § 2 (Exh. A), 2010; Ord. 1356 § 1, 1971; Ord. 1281 § 1, 1970; Ord. 1212 § 1, 1969; prior code § 33.513(I)(9)).