Section 506.2 allows an increase in allowable square footage if you've got more than 25% of your building perimeter on a public way or open area. The equation you use to get there has a value I sub f which is the area increase due to frontage. This must be a percent increase - is that right? It can't be a simple square foot increase, the resulting answer would always be too small. But the code is not clear on it.
Could you clear this up? Thanks.