Looking at some of the early video and stills....all the Light Standards appeared intact and the lights were on and illuminating the parking lot. There was very little horizontal movement if any at all by the aircraft from all appearances. There was a lot of stuff to run into all around the rooftop....but only the one AirCon unit seems to have been hit.
The tail boom is bent downwards....with a sharp crimp to it.
Which in my mind....supports the nearly vertical descent line of thinking.