For purposes of this Section, the following words shall be defined as follows:
COMMERCIAL CENTER: A building or group of buildings with retail and office uses which share a common parking lot and having a total roof area of in excess of forty five thousand (45,000) square feet.
FIRE LANE: An emergency access lane not less than twelve feet (12') wide and available for use by emergency vehicles including but not limited to, fire trucks, ambulances, and police vehicles.
PARKING AREA: The area or areas of land near or contiguous to the commercial center, including interior private roadways and drives used by the public as the means of access to and egress from the buildings, stores and business establishments within the commercial center and that part of the commercial center designated for the parking of motor vehicles.