Building 7, the question you have to answer is how long does it take someone to set the explosives sufficient enough to bring down the building the way it did? Then you have to compare that to the time-line and ask why there are no witnesses to the planting to said explosives? I find it highly unlikely it was a professional demolition of the building because in order to do that there would have to be many people and a lot of equipment at work to do it. The time-line needed to prep a building for demolition is many hours and holes have to drilled in support columns and packed with explosives and I do not believe it can be doen in a crowded city without witnesses.