>>518841450
You understand this construction method was banned everywhere else in the world because steel frame skyscrapers tend to collapse during a fire ? All other countries in the world used concrete core building for skyscrapers. But it was cheaper at the time and the only way to make buildings this tall because modern concrete for tall building were invented only in the 00s.
That's pretty much why all buildings made the same way as the twin tower near them collapsed, while the concrete ones resisted.