A used car business shall be considered and treated as one business if such business is conducted on two separate but contiguous lots or in buildings on two separate but contiguous lots, and it shall also be considered as one business even though it is conducted on two separate noncontiguous lots or in buildings which are located on two noncontiguous lots, provided that the boundaries of any part of such lots, or of lots having buildings thereon, on or in which such a business is conducted, are not separated by more than 100 feet, and also provided that only one office or headquarters controls, operates and manages the entire business and that it is one operation. The application for a license, as hereinafter provided, shall include the description of the entire area or areas on or in which such business is to be conducted, and one license shall be issued for the entire operation.