Each owner or occupant of a building upon any street or avenue of the City upon which a system of numbering has been adopted and in which official numbers have been provided for shall number his building in accordance therewith and no such owner, agent or occupant shall retain or use, or permit to remain upon any such building, any other number than the number officially designated for such building. It shall be the duty of such owner, agent or occupant, upon notice from the City Manager or any person designated by the Manager, to cause the official number to be placed on each building so owned or occupied by such owner or occupant or for which such agency may exist, such numbering to be done in the manner required by this chapter within thirty days after the service of such notice.
(1958 Code § 23.60)