Download big 3D city models
Download 3D big city models that waere made in 3D Studio Max 2012, with V-Ray. The scene has V-Ray materials and settings.
Great for using it in architectural scenes, or other kind of projects like games, advertising, animations, etc.
The city has a good variety of buildings. You can edit it as you want by moving around the blocks of buildings. Eventually you can also increase the dimensions of the city by multiplying the streets and buildings around it.