Allowable Area per IBC 2015
Is the allowable area in Table 506.2 :
per story? or for the entire building?
Say if I have a Type B, TYPEII, Spinklered 4 story building. Per the chart, I'd get 69,000 SF, is this per story? So after I work out my increases, is the allowable area value A(a), per story? or for the entire building? I'm reading BCI 2012, and it claims that the chart's value is per story.
Thanks!

My understanding is that it is per floor, but some of the calculations for increasing area modifications (like equation 52 in IBC 2015) take into account the number of stories within the calculation, so the A(a) derived using those equations is for the entire building.
EDITED for error

Ahh, you're right. In BCI (2018) p. 92 he gives a diagram explaining why it's not included. For mixed occupancies, you have to comply with each separate area's requirements on their own. So therefore each story must comply individually, and the A(a) can be calculated using equation 53.
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