All lots, buildings and structures in the city shall be numbered in accordance with the following plan:
The base line for streets running north and south shall be Mason Street, and numbers lying north or south shall be designated as north or south as the case may be; the base line for streets running east and west of this line shall be designated east or west as the case may be. Numbering shall begin at the base line, Franklin Street, with the number 100, and 100 units shall be allowed for each block, and the first number on the opposite side of the first street north or south of Mason Street and paralleling it, shall be numbered 200 and progress north and south therefrom at the rate of 100 numbers to each block; any house situated on any parcel of land between Mason Street and the first street north or south and paralleling it shall be numbered from 100 to 199 or as near thereto as can be. Odd numbers shall be on the south and west sides of the streets. All thoroughfares running north and south shall be named avenues, and those running east and west shall be named streets.
('72 Code, § 152.001)