506.3 Frontage Increase
To qualify for an area factor increase based on frontage, the public way or open space adjacent to the building perimeter shall have a minimum distance (W) of 20 feet (6096 mm) measured at right angles from the building face to any of the following:
- The closest interior lot line.
- The entire width of a street, alley or public way.
- The exterior face of an adjacent building on the same property.
Where the value of W is greater than 30 feet (9144 mm), a value of 30 feet (9144 mm) shall be used in calculating the building area increase based on frontage, regardless of the actual width of the public way or open space. Where the value of W varies along the perimeter of the building, the calculation performed in accordance with Equation 5-5 shall be based on the weighted average calculated in accordance with Equation 5-4.
W (Width: weighted average) = Calculated width of public way or open space (feet).
Ln = Length of a portion of the exterior perimeter wall.
F = Building perimeter that fronts on a public way or open space having a width of 20 feet (6096 mm) or more.
Exception: Where a building meets the requirements of Section 507, as applicable, except for compliance with the minimum 60-foot (18 288 mm) public way or yard requirement, and the value of W is greater than 30 feet (9144 mm), the value of W shall not exceed 60 feet (18 288 mm).
The area factor increase based on frontage shall be determined in accordance with Equation 5-5: