(A) Notice regarding sidewalk repairs, sewer or water connections, dangerous structures, abating a nuisance, or any other act, the expense of which if performed by the city, may be assessed against the premises under the provisions of this code, and shall be served in the following manner.
(1) By delivering the notice to the owner personally or by leaving the same at his residence, office, or place of business with some person of suitable age and discretion, or
(2) By mailing the notice by certified or registered mail to the owner at his last known address, or
(3) If the owner is unknown, by posting the notice in some conspicuous place on the premises for five days.
(B) No person shall interfere with, obstruct, mutilate, conceal, or tear down any official notice or placard posted by any city officer, unless permission is given by the officer to remove the notice.
(‘83 Code, § 10.12)