Study in the Physics of Freefall show the WTC Towers and WTC 7 Fell too fast with nearly no resistance.

In the absence of frictional drag, an object near the surface of the earth will fall with the constant acceleration of gravity g. Position and speed at any time can be calculated from the motion equations.
Illustrated here is the situation where an object is released from rest. It's position and speed can be predicted for any time after that. Since all the quantities are directed downward, that direction is chosen as the positive direction in this case.
http://www.v911t.org/Freefall.php