(A) Any notice due any person or required to be served by this code shall be served:
(1) By delivering the notice to the owner personally or by leaving the same at his or her residence, office, or place of business with some person of suitable age and discretion;
(2) By mailing the notice by registered mail to the owner at his or her last known address; or
(3) If the owner is unknown, by posting the notice in some conspicuous place on the premises 5 days prior to the date set therein for compliance.
(B) No person shall interfere with, obstruct, mutilate, conceal or tear down any official notice or placard posted by the city unless permission is given to remove the notice.
(C) The Clerk shall maintain a separate file of notices given hereunder, including a record of the date upon which the notice was delivered, mailed or posted.