Where the designation on the Zoning Map indicates a boundary which is a street or public right-of-way, the center line of the road right-of-way of the road shall be construed to be the boundary.

Where the designation on the Zoning Map indicates a boundary approximately upon a lot line, such lot line shall be construed to be the boundary. Such lines shall also include lines of creeks, streams and other waterways, including floodplain boundaries as may be applicable.

Distances shown on the Zoning Map are perpendicular distances from center lines of right-of-ways measured to the district boundary, which boundaries in all cases where instances are given are parallel to the road right-of-way.

In any case where a zoning district boundary is in question, the Code Enforcement Officer shall determine the location of such district boundary by the use of the graphic scale.

Lots divided by district boundaries. Where a lot is divided by any zoning district boundary so as to be in more than one zoning district and where such lot was an existing lot when such district boundary was established, a conforming use, occupying 50% or more of the area of said lot and having street frontage in the district where permitted, may be extended on such lot not more than 25 feet (measured perpendicular to the district boundary) into any district where such use is not permitted or to the property line if the district boundary is within 50 feet; in either case, all provisions of this chapter must be complied with.