Renders a grey screen

I’m new to blender and I’m working on my first building project. When I try to render all I get is a grey screen. I’ve checked everything that I saw that other people tried but I just can’t figure it out. PLEASE HELP!

https://dl.dropbox.com/u/89942728/Raleigh%20North.blend

Change Duplication from ‘Faces’ back to ‘None’.

You also need to adjust your lighting direction.

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You are the man! Thanks for the help. I’ve only been using blender for a week now and it’s nothing like the cad programs I’m used to but I’m getting there.