... after getting a front-row seat to two massive buildings collapsing. There was some serious damage to the building from the collapse of the towers, which was after all responsible for starting many of the fires.

Also, as far as I'm aware, almost all skyscrapers with major fire damage are largely uncontrolled fires on one or two floors, rather than uncontrolled fires throughout the entire building.

Also: http://www.sfgate.com/bayarea/article/Tanker-fire-destroys-p... --that's a steel structure (overpass, not a skyscraper) being collapsed entirely due to an out-of-control fire (due to a crashed gasoline truck).