Again, I'm watching the ROTS DVD right now. I see the Senate building (the circular building next to the smaller dome -- I think that's the Chancellor's office). I read somewhere that the Senate is two kilometers in diameter. This is the only hard figure I've come across in the literature regarding the size of a specific building on Coruscant. In one of the shots, some of the background buildings appeared to be taller than the Senate is wide. Wouldn't this pose a problem for people standing on open balconies, given the presumably lower oxygen content at such high altitudes? Of course, this is assuming Coruscant has the partial pressure of oxygen similar to Earth, and that the tallest buildings have open balconies. Another bit of evidence is the fall time of Anakin when he jumped out of the building in Episode Five. That building I think had an open balcony, but nobody seemed to have any problems breathing. Nonetheless, the descent was for several tens of seconds. Assuming Coruscant has a gravity similar to Earth, and that Anakin wasn't pulling any tricks on slowing his fall or whatever, that translates to well over a kilometer in height at least. A third piece of evidence is at the very end of Episode Five. A bunch of people are standing on a balcony watching large "star destroyer"-looking ships take off into the distance. They take off near some buildings, and the buildings look several times the size of the star destroyers. *If* the ships that were taking off are comparable to the star destroyers of the old Star Wars (i.e., about 1600 meters), the buildings in the background are definitely several kilometers tall. In any case, is there any definitive data on the height of the buildings on Coruscant?