For the purpose of this chapter, the Town of Babylon, outside of the incorporated villages, is hereby divided into use districts which shall be designated as follows:

The boundaries of the districts designated in § 213-56 are hereby established as shown upon the Building Zone Map of the Town of Babylon, Suffolk County, New York, as amended July 7, 1954, which map is hereby made a part of this chapter, and all notations, references and other things shown thereon shall be as much a part of this chapter as if fully described herein.

No building shall be erected, altered or used, and no premises shall be used for any other purpose than as may be permitted in the district in which such building or premises shall be located.

The boundaries between districts are either the center lines of streets or of railroad rights-of-way or such lines extended or lines parallel thereto, unless otherwise indicated upon the Building Zone Map. Where figures are shown on the Building Zone Map between a street and a district boundary line, such figures indicate that the district boundary line runs parallel to the street line at the distance so indicated by such figures. When the location of a district boundary line is not otherwise determined, it shall be determined by the scale of the map. Whenever the lines of an existing or mapped street vary from the same street lines as shown on the Building Zone Map, the district designated shown on the Building Zone Map shall govern and control.

Where a district boundary line divides a lot which was held in single and separate ownership on July 7, 1954, the Board of Appeals, as hereinafter provided, may permit the less restricted use to extend to the whole or any part of such lot for a distance not exceeding 50 feet.