The area of the lot shall be not less than 15,000 square feet, and the width of the lot shall be not less than 100 feet at the building line. Notwithstanding the foregoing, for lots with frontage on Golf Road, Par Drive, Coles Lane and Thomas Avenue, the area of the lot shall be not less than 20,000 square feet, and the width of the lot shall be not less than 150 feet at the building line.