How to create a realistic city in UE4?

Hello there,
I’m trying to make a FPS zombie game based in my home town in Las Vegas, Nevada. And I am having trouble trying to create a realistic 3D model of the city. I mainly just need to build the Las Vegas Strip and Las Vegas Downtown. If anyone has any tips, guidance that can point me in the right direction to my goal will be greatly appreciated. Thank you.

Sincerely,

There is a tool in blender that will let you use pictures. You do have to build the basic architecture, but then blender will apply the picture to the architecture of the scene. [It’s called Camera Mapping and 's a tutorial.][1] I think you might be able to experiment with this and get what you want.

you need blender and ablilty to follow instructions from this guy