(a) 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:
(.1) At least seventy-five percent (75%) of lots adjacent to the lot to be divided is 1,000 sq. ft. or less;
(.2) Each of the lots created is used for one single-family attached home; and
(.3) Each of the lots created meets the minimum lot width requirement of the zoning district.
(b) In the CMX-2 district, the number of permitted dwelling units is as follows, provided that, whenever the calculation of permitted number of dwelling units results in a fraction of a dwelling unit, then the number of permitted dwelling units shall be rounded down to the nearest whole number:
(.1) A maximum of two dwelling units are permitted for lots less than 1,440 sq. ft. in area;
(.2) A maximum of three dwelling units are permitted for lots that are 1,440 sq. ft. to 1,919 sq. ft. in area; and a minimum of 480 sq. ft. of lot area is required per dwelling unit for the lot area in excess of 1,919 sq. ft.