In the case of a single and separate lot meeting the requirements of this Subsection E for a buildable lot which is located in a major subdivision plat approved after October 14, 1957, by the Planning Board[2] of the Town and filed with the Suffolk County Clerk's office or in a minor subdivision plat approved after April 17, 1975, by the Planning Board of the Town and filed with the Southampton Town Clerk's office, relief for all front, side and rear yard and area dimensions shall be granted to the extent that such front, side and rear yard and area dimensions were required at the time the map was originally so filed as required by law.