Blaze burnt out 20-floor building overnight, but the tower did not collapse

Admittedly, this is a much newer building compared with the Twin Towers, but as can be seen in the footage, the flame was much stronger and lasted much longer. The inferno did not bring down the building. I am still puzzled why the Twin Towers and Building 7 all collapsed onto their respective footprint on that one day.



For comparison, here is a footage of the Twin Tower building burning just before the South Tower collapsed. A smoking flame could not be hotter than a bright orange flame.