(a) The citation may be served by the sheriff or constable upon a person not an inhabitant of this State by leaving a true and attested copy of the citation with his or her return endorsed, with, or at the residence of, his or her known agent or attorney, if he or she has one in this State; and if not, with, or at the residence of the occupant of the land to which such hearing may appertain. If there is no such occupant, then the copy of the citation shall be by the sheriff or constable left at the office of the Clerk of the City for the persons so owning or interested in such land.

(b) The City Clerk shall mail to the last known post office address of such person, in a registered package, a true and attested transcript of the copy so left with him or her, which shall be certified by him or her under the Seal of the City. The City Clerk shall certify under the Seal of the City all his or her doings touching the copy so left him or her by the sheriff or constable and shall attach to the certificate all registry receipts pertaining to the copy received by him or her.