Actually, as Dr. Jones notes Building number 7 had minor to moderate fires, Also, In the History of Steel buildings, never has one ever colpapsed due to fire. I would encourage you to read the article and especially Dr. Jones' paper:
Article
http://deseretnews.com/dn/view/0,1249,635160132,00
http://kutv.com/topstories/local_story_314234334.html
Paper:
http://www.physics.byu.edu/research/energy/htm7.html