An administrative citation may be served by personal delivery on any person determined to be responsible for the violation if the responsible person can be located. If the Code enforcement officer cannot readily locate a responsible party for personal delivery of an administrative citation, then the citation may be served by certified mail, postage prepaid, return receipt requested, addressed to a location reasonably calculated to give notice to the responsible party of the administrative citation. All notices required by this chapter to be served subsequent to service of a citation may be served either by personal delivery or by certified mail, postage prepaid, return receipt requested, and shall be deemed effective on the date of personal delivery or when the certified mail is either delivered or delivery is attempted.
If the certified mail receipt is returned unsigned, then service may instead be effected by regular first class mail, postage prepaid; provided, that the notice sent by regular mail is not returned by the postal service as undeliverable, and shall be deemed effective on the date three days following deposit in the mail.
Where a violation of Code provisions concerning the condition of real property is involved, an administrative citation or subsequent written notices authorized by this chapter may be served by certified mail at the address as shown on the last equalized County assessment roll.
Where a violation of Code provisions concerning the condition of real property is involved and personal delivery or service by certified mail upon the property owner is unsuccessful, service may be effected alternately or additionally by posting a copy of the order at a conspicuous location on the property which is the subject of the order.
Where service of any notice required under this chapter is effected in compliance with the requirements of this section and with due process the asserted failure of any person to receive the notice shall not affect the validity of any proceedings taken under this chapter.