Autogenerate low-poly massive metropolitan videogame 3D model -- 2

Make an autogenerated low-poly massive metropolitan 3D model with specifications of 20,000 city blocks squared with interior walls and floors, no exterior windows or doors, streets, sidewalks, elevator shafts and no elevators, parks train tracks, the works to be working in the game engine [ https://www.ambiera.com/coppercube/ ] and is a free game engine as to test for this working model as, it will all be on a flat surface, the image for shape of flat surface to be used will be included and with only 1 texture and use of normal map included as 2 part texture would be sufficient for appearance, no interior furniture or moving parts, no animations though, items such as trees and shrubs should be localized to be driven in motion by the engine wind and so forth.
Reference: [ https://en.wikipedia.org/wiki/Procedural_generation ]