Where uncertainty exists with respect to the boundaries of the various Districts as shown on the Zoning Map, the following conditions shall apply:
A. 
District boundaries are meant to and shall be considered to follow street, alley or lot lines, or lines parallel or perpendicular thereto, unless such boundaries are otherwise shown on the Zoning Maps.
B. 
Where a boundary line is shown within a street, alley or navigable or nonnavigable stream, it shall be intended to follow the center line of such street, alley or stream. Should the actual location of such street, alley or stream vary from the location as shown on the Zoning Map, then the actual natural location shall control.
C. 
Where a boundary line is shown as being located a specific distance from a street line or other physical feature, then this distance shall control.
D. 
In unsubdivided property, unless otherwise indicated, a District boundary line on the Zoning Map shall be determined by the use of the scale on the Zoning Map.
E. 
Wherever any road, alley or other public way is abandoned by official action as provided by law, the Zoning Districts adjoining the side of such public way shall be automatically extended, depending on the side or sides to which such lands revert, to include the right-of-way of the public way thus vacated, which shall thenceforth be subject to all regulations of the extended District or Districts.