The commissioner of streets and public improvements shall cause a notice to be served on the owner of the property immediately abutting upon such portion of the sidewalk, stating the condition thereof, and instructing the owner to clean, repair and renew such portion of the sidewalk. The notice provided for shall be deemed sufficiently served if delivered in person to the owner of the property or to his authorized agent, or by leaving a copy of such notice at the home of the owner or authorized agent, or if the owner is a nonresident, by mailing a copy to his known address; or if the owner of the property is unknown or if his address is unknown, then such notice shall be addressed to the general delivery office of the city wherein the improvements are to be made.
(1958 code § 6.40.020)