Here are some simple concept level design skyscrapers to make city or game designs with. The SKyscraperFX for SketchUp software and info that made them is also available in the model library links.
https://3dwarehouse.sketchup.com/user.html?id=ddeada2d-3c07-485c-b143-f66b624d798b%26amp;login=true%26amp;nav=models
