These regulations shall be binding upon all usages herein referenced except for those properties with usages established by a valid business license at time of implementation of this chapter. Usages in existence by valid business license at time of implementation shall be allowed to continue as per application of sections 12-17-4, 12-17-5 and subsection 12-17-6A of this chapter. Application of subsection 12-17-6B of this chapter shall require business and/or property to be brought into compliance with this chapter. (Ord. 1000, 7-12-1999)