Where the boundary lines are shown on the maps listed in § 200-5 above as approximately following the street lines of public and private ways, railways or other rights-of-way, the center lines of such ways shall be the boundary lines.

Where the boundary lines are shown approximately following the location of property lines by means of dimensions shown in figures, then the property or lot lines shall be the boundary lines.

Boundary lines located outside of street lines and shown approximately parallel thereto are parallel to such street lines, and dimensions shown in figures between boundary lines and street lines are the distance in feet of the boundary line from the street line such distances being measured at right angles or radial to such street lines unless otherwise indicated.

In all cases which are not covered by other provisions of this section, the location of boundary lines shall be determined by the distance in feet, if given, from other lines upon said map by the use of identifications as shown on the map, or by the scale of the map.

Whenever any uncertainty exists as to the exact location of a district boundary line, the location of such line shall be determined by the Inspector of Buildings, provided, however, that any person aggrieved by his decision may appeal to the Board of Appeals, as provided in § 200-63 of this chapter.