mr. bonowitz. >> you retrofitted the small building and adjacent to it i see two brick buildings. >> howyou feel about the big buildings. >> that is a hard question to answer. i put very thick plywood on the roof. >> how thick to support a story falling? >> (laughter). >> thanks for helping me out. (laughter). >> the rialto building. this is interesting building that survived the '06 quake. >> it did. in some of the reports it is reported it had undergone earthquake damage. if you look more into the building. in the 1907, they basically explain the damage is dynamiting. this is a building they tried dynamite apart to create a fire break, and the building wouldn't do it. it said no because it is a steel framed building. and as a class steel frame buildings are very resistant to both earthquakes and dynamite. >> am i right? i think steel frame buildings are resistant, it is the composite action of the steel frame and other elements that are together with the frame that help make them support; is that right? >> yes. that includes the walls, the floor diaphragms. but the fire was really bad.