I don't think I agree with this assessment. Being in the same profession as Mr. Karp, my feeling is that such a catastrophic collapse was due to failure underneath the building. If too much load was concentrated on the roof area, collapse would have occurred in the top level or two, not the entire building pancaking all the way down. I believe the cause was structural failure due to severe failure of the foundation area....possibly due to increasing instability as a result of sea water seepage over time, and/or a sudden collapse of the fill. I have been involved in a couple of lawsuits of shoddy "cut corners" work where contractors have not followed engineering structural calculations, where a roof caved in, and in other compromised structural issues, but never such that an entire 12 story building would, or have the potential of entire collapse.