The boundaries between districts are, unless otherwise indicated, either the center lines of roads and of rights-of-way of railroads and/or public utilities, or such lines extended, or lines parallel thereto. Where numbers are shown on the zoning map between a road and district boundary line, they indicate that the district boundary line runs parallel to the road line at a distance therefrom equal to the number of feet so indicated.

In undivided property, the district boundary lines on the zoning map shall be determined by use of the scale of the zoning map.

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 the use in the less restrictive district shall extend over the portion of the lot in the more restricted district, a distance not to exceed 50 feet beyond the district boundary line; provided, that in case of a lot, other than a corner lot, the regulations as to the use in a less restricted district may extend a distance of more than 50 feet beyond the district boundary line, when authorized as a special exception.

If there is a question as to location of any district boundary, line, or other line, then in that event, Borough Council shall designate the location of the district boundary line or other line.