(iii) the area proposed as an empire zone shall not exceed:
two square miles for any zone, such area shall be defined by one or more borders, which borders shall be determined by the applicant and need not be entirely coterminous with the borders of census tracts or block numbering areas provided, however, that such zone shall be located entirely within traditional neighborhood or community boundaries, and where appropriate, be bounded by major natural or man-made physical boundaries, such as bodies of water, railroad lines, or limited access highways, and the zones created pursuant to paragraph (viii) of subdivision (b) of section nine hundred sixty of this article should be limited to one square mile; provided however, empire zones designated under subdivision (b) of section nine hundred sixty of this article may apply to increase their distinct and separate contiguous areas to two square miles; provided further, regionally significant projects are not included within such two square mile limitation;