1. 1  Applicable to buildings with more than 25% of perimeter fronting on a public way or open space with minimum 20’ in width. I f = [F/P – 0.25]W/30 I f = Area increase due to frontage. I f = Area increase due to frontage. F = Building perimeter that fronts on a public way or open space having 20 feet (6096 mm) open minimum width (feet). F = Building perimeter that fronts on a public way or open space having 20 feet (6096 mm) open minimum width (feet). P = Perimeter of entire building (feet). P = Perimeter of entire building (feet). W = Width of public way or open space (feet) in accordance with Section 506.2.1. W = Width of public way or open space (feet) in accordance with Section 506.2.1. Area Increase Due to Frontage (506.2)

2. 2 I f = [F/P – 0.25]W/30 Area Increase Due to Frontage Approved Fire Line Open space shall be either on the same lot or dedicated for public use and shall be accessed from a street or approved fire line (506.2.2) N www.ara4help.com

3. 3 Area Increase Due to Frontage (Building does not comply with 506.2.1 Exception) If = [F/P – 0.25]W/30 =20x(20+30)/2+80x30+30x20+60x30+20x30+20x(20+30)/2+5x(20+30)/2+10x30+50x3020+80+30+60+20+20+5+10+50 W= 8325295 W= = 28.22’ F = 295’ P = 340’ = [295/340 – 0.25] 28.22/30 If = 0.58 N www.ara4help.com

4. 4 N If = [F/P – 0.25]W/30 =80x(20+60)/2+20x60+30x20+40x60+20x(60+50)/2+20x60+20x(30+20)/2+5x(20+30)/2+10x60+50x6080+20+30+60+20+20+5+10+50 W= 13925295 W= = 47.20’ F = 295’ P = 340’ = [295/340 – 0.25] 47.20/30 If = 0.97 Area Increase Due to Frontage (Building complies with 506.2.1 Exception) www.ara4help.com

5. 5 N 1111111112 14141414 5 4 3 10101010 6 9 7 8 12121212 13131313 www.ara4help.com Using Cha-Cha Calculator