Boundaries of the districts as enumerated in Section 400.020 of this Chapter are hereby established as shown on the maps, which maps are hereby designated as the "Zoning District Maps" and said maps and all notations, references and information shown thereon are hereby made as much a part of the ordinance as if the same were set forth in full herein. It shall be the duty of the Planning and Zoning Commission to keep on file in its office an authentic copy of said maps and all changes, amendments or additions thereto.

When definite distances in feet are not shown on the Zoning District Maps, the district boundaries are intended to be along existing street, alley or platted lot lines or extensions of the same; and if the exact location of such lines is not clear, it shall be determined by the Planning and Zoning Commission, due consideration being given to location and indicated by the scale of the Zoning District Maps.

When streets or alleys on the ground differ from the streets or alleys as shown on the Zoning District Maps, the Planning and Zoning Commission may apply the district designations on the maps to the street or alleys on the ground in such manner as to conform to the intent and purpose of this Chapter.

Whenever any street or alley is vacated, the particular district in which the adjacent property lies shall automatically be extended to the centerline of any such street or alley.