Peter R. wrote:


How does an aircraft hit the north face of a building along the river
there? One possibility is that the pilot lost control of the aircraft
during the turn, say due to a stall. Another possibility is that the pilot
misjudged the point at which to begin the turn.


Accellerated stall is a possibility. Overbank an already tight turn.
Remember that once the stall occurs it's not only altitude that is lost,
lift is what is turning the aircraft.