Where an establishment is part of a larger retail, commercial, or industrial development, shopping center, or similar land use with multiple occupants or tenants, the total number of freestanding on-premises signs shall be limited to one sign per lot that identifies the development or center and individual tenants or businesses therein, provided that a uniform sign plan and permit has been submitted and approved for the entire development. No freestanding on-premises signs shall be allowed for individual establishments within a larger shopping center, commercial, or industrial development, or similar land use with multiple occupants, unless an alternative master sign plan is presented and recommended to the Planning Commission and approved by the Board of Supervisors.