Where uncertainty exists with respect to the boundaries of the various districts as shown on the maps accompanying and made a part of this Zoning Code, the following rules shall apply:
(a) The district boundaries are either streets or alleys, unless otherwise shown, and where the designation on the maps accompanying and made a part of this Zoning Code indicating the various districts are approximately bounded by street or alley line, the centerline of such street or alley shall be construed to be the boundary of such district.
(b) Where the district boundaries are not otherwise indicated and where the property has been or may hereafter be divided into blocks and lots, the district boundaries shall be construed to be lot lines, and where the designation on the maps accompanying and made a part of this Zoning Code indicating the various districts are approximately bounded by lot lines, such lot lines shall be construed to be the boundary of such district, unless such boundaries are otherwise indicated on the maps.
(c) In the unsubdivided property, the district boundary lines on the map accompanying and made a part of this Zoning Code shall be determined by use of the scale contained on such map.