§ 1-110.  Service of Notice of Violation.
   (1)   All written notices of violation of any provision of this Code shall be deemed served:
      (a)   when delivered by hand to the alleged violator; or
      (b)   when regularly mailed to:
         (.1)   the alleged violator, or his agent;
         (.2)   the last-known residence of the alleged violator; or
         (.3)   the usual place of business of the alleged violator; or
         (.4)   any adult person in charge of the premises where the alleged violation exists.