IBC 2003 Area Modifications for Frontage

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.
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