Lots with at least 200 feet of frontage on Interstate 380 are eligible for increased ground sign size and height dimensions as specified in this section in recognition of the larger lot sizes, building sizes, and the larger visual field associated with such development.
   1.   Height.  The maximum height of ground signs may be 5 feet taller than the average height of the principal building on the lot but shall not exceed 40 feet maximum. This is intended to be a bonus standard for taller buildings, and shorter buildings are entitled to the standard maximum height for the zoning district in which they are located.
   2.   Area.  The maximum area of ground signs shall be 150 square feet, plus a bonus of 40 additional square feet per business, enterprise, institution or franchise within the development complex, provided that such bonus shall not exceed 200 square feet.