A record of such numbering shall be kept by the engineer in a book provided for that purpose, and such record shall be evidence of the respective numbers or designations aforesaid. The city engineer shall prepare the necessary plat or plats, map or maps, showing the numbers to be assigned to all lots, building and frontages, situated upon the streets and avenues of said city as above described, and no owner or other person shall affix a street number to any building in said city other than that shown by the record and maps aforesaid as belonging to the location of said building, without having first obtained from the engineer the number assigned as aforesaid. The number of all dwellings, business houses or other structures erected hereafter, shall be supplied to the owners, agents or occupants of such buildings by the city engineer. Said engineer shall issue to the applicant therefor a certificate, giving the number, names of the occupant, agent or owner and the location of the premises to be numbered, and shall make a record thereof in the engineer’s office office. The numbers shall be procured by the applicant at the applicant’s own expense and affixed to the building or place of business to which it belongs in a conspicuous place, either above or at the side of the front entrance to said building or place of business, and shall be thereafter maintained by the owner or agent of said building or place of business. (Prior code § 13.08.050.)