Sort:  

I believe wtc 7 was the real target of 9/11. It housed a lot of govt agencies like the SEC. Which was investigating Enron and other companies like it and the club used 9/11 to get rid of the paper trails.
http://www.wtc7.net/background.htm

agreed. probably controlled demo.

Ok, but WHY ?

Maybe the others were controlled demo and building 7 was late to the party