At the 7:30 mark of your video I cannot see the lower portion of the building where a controlled demo would begin.
However, as noted in this comment:
even though they apparently tried to crop the video to exclude the penthouse it is still visible enough to see it go first.
However, as noted in this comment:
Quote:The collapse began when a critical internal column buckled and triggered structural failure throughout, which was first visible from the exterior with the crumbling of a rooftop penthouse structure at 5:20:33 pm.
even though they apparently tried to crop the video to exclude the penthouse it is still visible enough to see it go first.
