When uncertainty exists with respect to the boundaries of the various districts, as shown on the zoning district map, the following rules shall apply:
A. District boundary lines are either the center lines of railroads, highways, streets, alleys or easements, tract or lot lines or such lines extended, unless otherwise indicated.
B. In areas not subdivided into lots or blocks, wherever a district is indicated as a strip adjacent to and paralleling a street, highway, or railroad, the depth of such strips shall be in accordance with dimensions shown on maps measured at right angles from the center line of the street, highway or railroad, and the length of frontage shall be in accordance with dimensions shown on the map from center lines of streets, highways, or railroad rights of way unless otherwise indicated.
C. Where a district boundary line divides a lot in single ownership, the regulations for either portion of the lot may, in the owner's discretion, extend to the entire lot, but not more than twenty five feet (25') beyond the boundary of the district. (1985 Code)