Every required parking space shall have an area not less than one hundred eighty (180) square feet and shall have a width not less than nine feet, and a length of not less than eighteen (18) feet, exclusive of maneuvering space and driveways which shall be provided as required to make each parking space independently accessible from the street at all times. No required parking space shall occupy any required front yard or any required street side yard of a corner lot, or any required setback from a driveway or any part of a required loading space. All required parking spaces shall be provided on the same building site as the use of building for which they are required. (Prior gen. code § 8-63.4)