speed modeling big city, less than one day to make it.
step 1 : use a satellite shot of any big city.
step 2 : outline the city blocks with curves.
step 3 : extrude the curves.
step 4 : (only for overview shot), project your blocks curve on a plane and use the trim tool to make the roofs.
step 5 : displace/bump your frontages with architectural shots.
