most controlled demolitions people have seen on video, the demolition is engineered so the debris is readily removable. The engineering would likely be different to create the appearance of collapse. Instead of removing the support structures from botoom to top in a controlled sequence, it is possible to shear floor structure connections on the perimeter. Shearing the bolted connections involves far less material than a concrete encased column or structural steel components. Time shearing of the floor connections for several floors and create a vertical domino effect. Lower floors may also have some perimeter connections sheared so to to direct all the force downward and not force out the sides of the structure.