Where district boundaries are indicated as approximately following the center lines of streets, highways, public utility easements, waterways or railroad rights-of-way or such lines extended, such center lines shall be construed to be district boundaries.

Where district boundaries are indicated as approximately following the lot line, such lot lines shall be construed to be the district boundary line. In all cases where a district boundary line is located no farther than 15 feet from a lot line, the district boundary shall be construed to coincide with the lot line.

In all cases where a district boundary line divides a lot in one ownership and more than 50% of the area of the lot lies in the less restrictive district, the regulations prescribed by this chapter for the less restrictive district shall apply to such portion of the more restricted portion of the lot which lies within 30 feet of the district boundary. The regulations for the more restrictive district shall apply to the portion beyond the thirty-foot area. For purposes of this section, the Residential - Rural (RR) District is more restrictive than the Residential - 1 (R-1) District, the Residential - 1 (R-1) District is more restrictive than the Residential - 2 (R-2) District, etc., and residential districts are more restrictive than business or industrial districts.

In all other cases where dimensions are not shown on the map, the Zoning Board of Appeals, under the provisions of § 160-16, Zoning Board of Appeals, shall determine the location of boundaries.