All dwelling units must be at least fifteen feet in width or diameter (excluding eaves) and, with the exception of single-family dwellings, shall contain the following minimum gross floor area, exclusive of parking areas, open porches, and patios:
1. Studio: four hundred fifty square feet;
2. One-bedroom: six hundred fifty square feet;
3. Two-bedroom: eight hundred square feet;
4. For each additional bedroom in excess of two: one hundred square feet.