i had a look on the internet for some images to help inspire us. the theme for the level is a city which trails off into a desert. here are a few pictures i found which i feel represent the ideas of the location.

a city in yemen. i originally envisioned a commercial city for example new york with large buildings and neon signs etc, however this city made of mud is very unique. the building design is interesting. might use this type of city for the level, rather than a modern one.

this picture is even closer to the idea in my head as it also contains an armoured vehicle. as you can see the large city is closely connected to the desert.
i imagined a toll booth similar to this as the player leaves the city. a toll booth with a barrier would be good as this could be broken through or shot down for some action.
posted by alec 0804045