Unimproved nonconforming lots. Notwithstanding any other provisions of this section, any existing lot (as of August 15, 2003), (including any vacant lot in the residential one zone (R-1)) of at least one acre regardless whether there is any other adjoining land owned by the owner of such lot, and which is nonconforming as to dimensions or area, may be improved with a new building or structure, in accordance with the use requirements of this section, provided that the minimum setbacks shall meet the former R-1 zoning district requirements, including the environmental constraints calculation, which are:
1. Minimum lot width — 150 feet in the street line.
2. Minimum lot depth — 200 feet from the street line.
3. Minimum side yard — 30 feet each from the lot line.
4. Minimum front yard — 40 feet from the street line.
5. Minimum rear yard — 50 feet from the lot line.
6. Maximum building coverage — 10% of total lot area.
7. Minimum residential floor area — 1,000 square feet.