The scene must be demonstrated on the engine Unreal Engine 4 and fully optimized under it. Please quote in the answers from what amount (price) you can work, and your worthy projects.
the first stage, the overall pattern of all buildings on the map:
Only use licensed software or free analogues;
Must have dimensions;
Only the appearance (to give the desired size, dimensions, the main features of the building, storage element, key features of the building - examples pillars, balcony, the distance between the windows, etc.);