. >> i'd like to again erick wong. i'd like to state that with base isolation or without base isolation on a standard 6 believe it the standard - the question is what does base isolation do stem from understanding of how forces are taken down from the superfluous structure above down into the soil. and it was our conclusion that the amount of force and with or without the base isolation system has negative impact with the force onto the soil and the adjacent >> okay. i'm trying to understand that. conventional ways is you build a fix base and it means under the building it's constructed to have a little bit of flexibility so in shaking the building can absorb the shaking >> so the sub structure the 3 story parking abandonment is a fixed sub structure the base isolation is at the gund that's why the comment was not relevant in this conversation. >> so you're saying the base isolation stabilizes what is above the ground. >> they're both stable. >> right but the isolation - >> it will reduce the accelerations that travel