You could always render the Dystopia city in Bryce from a top view,.........then in an image editor(such as Photoshop or Paint Shop Pro)convert that image to greyscale, then create a lattice terrain object using that greyscale image as your heightmap, then create the destructions with a brush in the terrain editor. Just a thought.

"Any club that would have me as a member is probably not worth joining" -Groucho Marx