Where uncertainty exists as to the boundaries of the zoning districts as shown on the Official Zoning Map, the following rules shall apply:

(a) Zone boundaries are generally intended to follow lot lines.

(b) Zone boundaries, where indicated, are the center lines of streets, parkways, waterways, or railroad rights-of-way.

(c) Where the street layout on the ground varies from the layout as shown on the zoning map, the Building Official (see Definition 25) shall interpret said map according to the reasonable intent of this Ordinance.

(d) Where the zone boundary divides a lot so that more than 50 percent of the lot area is in a more restrictive zone, the provisions of this Ordinance relating to the more restrictive zone shall be extended to the entire lot.

(e) Where the zone boundary divides a lot so that 50 percent or more of the lot area is in a less restrictive zone, the provisions of this Ordinance relating to the less restrictive zone shall be extended to the entire lot.