The notice referred to in Section 1353.12 may be served personally, by prepaid telegram or certified mail addressed to the last known address of the person to be served or by leaving a copy of such notice at the usual residence of the person to be served. If the last known address cannot be ascertained, the notice shall be posted on the outside front entrance of the building. (Ord. 1980-56. Passed 11-25-80.)