Oh great. I've been calling it Corrus-kant all these years. Next someone's gonna tell me I've been mispronouncing Eidos, too. Well, however it's pronounced, this six-minute vid shows us how BioWare built the city-planet of the Star Wars Universe.
From a design perspective, Coruscant is a planet with zero percent terrain, which poses its own challenge. The city also has an enormous vertical dimension to incorporate, with skyscrapers soaring overhead, and unruly, bombed-out subterranean areas underneath.
The Making of Corsuscant [swtor.com]