506.3 Frontage Increase

Every building shall adjoin or have access to a public way to receive an area factor increase based on frontage. Area factor increase shall be determined in accordance with Sections 506.3.1 through 506.3.3.

To qualify for an area factor increase based on frontage, a building shall have not less than 25 percent of its perimeter on a public way or open space. Such open space shall be either on the same lot or dedicated for public use and shall be accessed from a street or approved fire lane.

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:

1. The closest interior lot line.
2. The entire width of a street, alley or public way.
3. 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.

where:

W		(Width: weighted average) = Calculated width of public way or open space (feet)
Ln	=	Length of a portion of the exterior perimeter wall.
wn	=	Width (≥ 20 feet) of a public way or open space associated with that 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.

The area factor increase based on frontage shall be determined in accordance with Equation 5-5:

where:

If	=	Area factor increase due to frontage.
F	=	Building perimeter that fronts on a public way or open space having minimum distance of 20 feet (6096 mm).
P	=	Perimeter of entire building (feet).
W	=	Width of public way or open space (feet) in accordance with Section 506.3.2.