Hello, I happened to see this frontage increase example (a sprinklered Type II-B office building on a big enough site so that the area of the building is not limited by frontage or property lines in any way (i.e., If = 0.75). When you see allowable total area, it is multiplied by "3" not "4" even though it can be built up to 4 stories, and then divided by "4".
According to IBC 2015 506.2.3:
It is allowed to multiply by 4 if the building is equipped with an automatic sprinkler system.
Do you think the example is not correct?
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