All I am going to say about ths is that a 100+ storey steel-frame building in Madrid recently burned like a torch for about 18 hours and did not collapse. See the pictures here.

Unlike the Windsor building, the WTC towers were neve actually engulfed by flames and firefighters were able to make their way to the affected floors (in Madrid thwy pretty much to give up and the building had to be demolished after the fire died out).

Draw your own conclusions.

A society committed to the notion that government is always bad will have bad government. And it doesn't have to be that way. — Paul Krugman