For the purpose of this Chapter 27, West Norriton Township is hereby divided into classes of districts, which shall be designated as follows:

The boundaries of districts shall be as shown on the map on file in the Township office, as amended, and shall be known as the "Zoning Map of West Norriton Township." The map and all notations, references and data shown thereon are hereby incorporated by reference into this Chapter 27 and shall be as much a part of this Chapter 27 as if all were fully described herein.

The boundaries between districts are, unless otherwise indicated, either the center lines of streets or railroad rights-of-way, or such lines extended or lines parallel or perpendicular thereto. Where figures are shown on the Zoning Map between a street and a district boundary line, they indicate that the district boundary line runs parallel to the street line at a distance therefrom equivalent to the number of feet so indicated, unless otherwise indicated.

Where a district boundary line divides a lot held in single and separate ownership as of August 8, 1952, the use regulations applicable to the less restricted district shall extend over the portion of the lot in the more restricted district a distance of not more than 50 feet beyond the district boundary line.