The iconic building collapses of 9/11 were the twin towers.
As for the point about buildings collapsing by fire, there were even at the time historical cases of fires damaging fireproofed structural members: in the One Meridian Plaza fire of 1991, significant but non-total damage to structural members was observed. That One Meridian Plaza did not collapse when 7 World Trade Center did reflects the differences in the designs and in the parts of the buildings affected.
Two reasons:
The natural assumption is that the collapses are related. (Obligatory xkcd reference to amuse the lurkers.)
The iconic building collapses of 9/11 were the twin towers.
As for the point about buildings collapsing by fire, there were even at the time historical cases of fires damaging fireproofed structural members: in the One Meridian Plaza fire of 1991, significant but non-total damage to structural members was observed. That One Meridian Plaza did not collapse when 7 World Trade Center did reflects the differences in the designs and in the parts of the buildings affected.
3. I don’t know about you but I’m on Silverstein’s payroll.