The work of assigning numbers to buildings shall be done under the supervision of the City Engineer or some competent person appointed by Council. Said officer or person, on being informed of the present or intended location, shall designate to the owner or occupant of any building now erected, in process of construction, or to be hereafter erected the correct number of such building, and shall also prepare and place on file with the Clerk-Treasurer a map or diagram showing the location of the numbers required by this chapter.
('74 Code, § 152.06)