There shall be only one principal use (together with permitted accessory uses) on a zoning lot except that in the LI, B, or OR Districts, multiple principal uses may be permitted as a conditional use in a building or buildings designed to house multiple principal uses, subject to the terms and conditions of the conditional use permit. More than one zoning lot may be combined to create a multiple principal use activity, such as a mall, pursuant to a conditional use permit, subject to the terms and conditions of the conditional use permit. (Ord. 94-411, 11-1-1994)