The purpose of this Section and Sections 20-86.2 to 20-86.4 is to prohibit the use of private parking lots by persons not authorized by the owners thereof. The City requires that new or expanded business establishments construct and maintain parking lots to serve their customers and employees. If the use of these lots is not regulated and limited to persons authorized to use such lots by the owners thereof, it will defeat the purpose of the parking requirements imposed by the zoning ordinance and be an injustice to the persons who construct and maintain such lots.