>>23043306 (OP)
The building had a unique design, with long-span floor systems and a transfer truss system, making it more vulnerable to collapse once a key column failed.
It was also built over a Con Edison power substation, adding complexity to the structural design.
>>23043306 (OP)
all three buildings were prepared for controlled demolition months in advance
the planes they flew into the towers didn't do enough damage on their own but for 1 and 2 it was enough to look plausible when they pushes the button. with 7 the damage was clearly not enough but they pressed the button on it anyway