For the purpose of this chapter, the Township of Springfield is hereby divided into 17 districts, which shall be designated as follows:

The boundaries of said districts shall be as shown upon the map attached to and made a part of this chapter, which shall be designated the "Zoning Map." The said map and all the notations, references and other things shown thereon shall be as much a part of this chapter as if the matters and things shown by said map were all 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 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 this amendatory ordinance becomes effective, the regulations as to the use in the less restricted district may, when authorized as a special exception, extend over a portion of the lot in the more restricted district, not to exceed a distance of 50 feet.