(2)   Minimum Lot Area.
In the RSA-5 district, the minimum lot area shall be 1,440 sq. ft., except that a lot containing at least 1,600 sq. ft. of land may be divided into lots with a minimum lot size of 800 sq. ft., provided that:
(a)   At least seventy-five percent (75%) of lots adjacent to the lot to be divided is 1,000 sq. ft. or less;
(b)   Each of the lots created is used for one single-family attached home; and
(c)   Each of the lots created meets the minimum lot width requirement of the zoning district.