For the purposes of this chapter, Chadds Ford Township is hereby divided into the following districts:

The boundary of said districts shall be shown upon the map which shall be designated the "Zoning Map." The said map and all notations, references and other things shown thereon shall be part of this chapter.

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 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 center line of the Street at a distance therefrom equivalent to the number of feet so indicated.

When a district boundary line divides a Lot held in a Single and Separate Ownership at the time of the adoption of this chapter, the following shall apply.