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Well, the title is pretty much self explanatory, but i would love to see a tutorial, because I am new at this and i just phail at making a building for my story
I would start with the official SketchUp tutorials. http://sketchup.google.com/training/videos.html
Making a building can be done so many different ways at different levels of detail so its hard to create a generic building tutorial. If you have more specific questions let me know.