2 ms·If you design for 100 story buildings, you can design for a few story building with dirt on top.by pkaye 12y agoIf you design for 100 story buildings, you can design for a few story building with dirt on top.deleted 12y ago[deleted]zaroth 12y agoIt's fixing the leaks in 20 years that's the problem. But I guess the building just has to outlast the company...notatoad 12y agoNah, we've gotten pretty good at sealing concrete. You put enough tar and landscaping fabric under there, it'll last a while.