Your link made no reference to WTC7; why is that?Including 2.25 seconds of free fall acceleration over eight stories.The obvious place to start would be GOOGLE. Just punch in "why did building 7 collapse on 9 11" and you will get both factual theories (Structure Mag, POP Mechs, NIST Report) and all the CTs you can handle. There's even an independent study by some Chinese University. Have fun!
Debunking 9/11 Conspiracy Theories and Controlled Demolition - Free Fall
Here's one for you...convince me you're smarter than David Chandler.