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

The boundaries of said districts shall be as shown upon the Zoning Map, which said map is on file at the office of the Township Secretary, 10 Community Park Drive, Baldwin Township, Allegheny County, Pennsylvania. The Zoning Map shall be kept on file at the office of the Secretary of Baldwin Township and shall be available for public examination at such office, except that such Zoning Map may be removed from such office for any reasonable purpose upon the order of the Township Commissioners or the Zoning Hearing Board, upon the joint order of the President or Vice-President of the Township Commissioners and the chairman of the Zoning Hearing Board.

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

When a district boundary line divides a lot held in single and separate ownership at the effective date of this chapter, the regulations as to use, height, and area in 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; provided, that in the case of a lot other than a corner lot, the regulations as to the use, height, and area in the less restricted district may extend a distance of more than 50 feet beyond the district boundary line when authorized as a conditional use.