1604.10, and then basically, that requires a full wind and seismic detail of youren tear building perasc 7. so the point to take away from this is the 30% rule. if you're doing a remodel and it affects any structure of your bshlgs you have to provide a full lateral strengthening of your entire building, okay? so example i like to use is a simple third floor remodel. again, i'm going to use a two family dwelling, wood framed nonrated building, numbers three -- three stories. so you look at the picture on your left, this is existing condition, you know, idealizing existing condition of your building. you're trying to open up the kitchen so it's open to the living and dining room. 50% of your load goes to the interior wall for tributary area and exteriors take 25%, so hypothetically, let's say we get rid of that interior wall. now you have the bottom left condition where then the load gets transferred, distributed evenly into each of the walls, so 25% to each of the exterior walls, right, so your load increases from 25% to 50% of the exterior bearing walls, right. that's 100% increase of th