I tried to post a reply to a comment below about where to find proof of a demolition, but for some reason it's not showing up.
Anyways if you have not checked out this sight before I'd recommend it - http://www.ae911truth.org/. It's an organization of Engineers (over 2000 and counting) that question the official story of building 7 from an engineering standpoint.
They also put together a pretty good documentary summarizing the problems with the official story around building 7 here - http://www.youtube.com/watch?v=Ddz2mw2vaEg
Hope this helps!
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