The great question about whether there were any witnesses to the duel between Darth Sidious and Mace Windu made me thinking about the location of the Chancellor's office...
The Senate Office Building was a dome-shaped office building located close to the Senate Building on Coruscant. Among many offices it also contained the Chancellor's office which, according to Wookieepedia, was located near the top of the building.
However, if we take a look at a cutaway taken from Star Wars: Complete Locations, we notice that the exterior walls of the office are straight vertical. This shouldn't be possible on the top of a dome-shaped building.
In addition, in the scene from Revenge of the Sith where Windu's lightsaber fell down from the office window, the walls appeared to lead almost straight down.
Of course, it could be said that the scene was taken from the very end of the lightsaber fall, close to the street level. But in that case, shouldn't we be seeing only the lower floors of the surrounding buildings?
So, was this a movie mistake or was there possibly a straight vertical structure on the other side of the Senate Office Building that we just cannot see? In my opinion, regarding to these observations, the Chancellor's office could not have been located on the top of a dome-shaped building.