(a) District boundary lines are the center lines of highways, streets, alleys, and easements; or right-of-way lines of railroads, toll roads, and expressways; or section, division of section, tract and lot lines; or such lines extended, unless otherwise indicated.
(b) In areas not subdivided into lots and blocks, wherever a district is indicated as a strip adjacent to and paralleling a street or highway, the depth of such strips shall be in accordance with dimensions shown on the maps measured at right angles from the center line of the street or highway, and the length of frontage shall be in accordance with dimensions shown on the map from section, quarter section, or division lines, or center lines of streets and highways, or railroad right-of-way, unless otherwise indicated.
(c) Where a district boundary line divides a lot in a single ownership on the effective date of this Ordinance, the Board of Zoning Appeals, after due hearings, may extend the regulations for either portion of such lot.