I do not see my post to this question, so I will repost:
From FIRST post we found
Speed at top of window = 8.9875 m/s Distance from roof top to top of window 4.12 m
NOW
Time to travel past window = .125 then to ground 1 sec = total 1.25 sec
x = distance to top of window from ground
= xo+vot+1/2 at^2 where xo=0 vo= 8.9875 m/s (NOT zero as I previously used) t= 1.125
= 8.9875 (1.125) + 1/2(9.8)(1.125^2) = 16.31m
16.31 m <-------- add THIS to the distance from the top of the building to top of window
16.31 + 4.12 = 20.43 m = building height (sorry for the previous error)