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Graduate of CUA School of Architecture 1984, B.S. in Architecture
Graduate of CUA School of Architecture 1985, Bachelor of Arch.
Licensed Architect, Wash, DC since 1989

Not necessarily disputing geo-social origins of: the hi-jacked plane(s), etc. My opinion is strictly limited to the physical collapse.
In my opinion, the collapse(s) were possibly mechanically / explosively-assisted. By many accounts these buildings housed some very important tenants, which may keep very important information files, etc. There is the possibility that these buildings have been "pre-wired" to be demolished if security were ever to be breached in a major way. Anecdotaly speaking: remember the opening scenes of the original "Mission Impossible"?..."this tape will self-destruct in 30 seconds". In my opinion the term "pull it" had to do with orders to destroy the properties due to un-avoidable security breaches that would ensue as a result of a myriad of persons going into previously secured areas of the buildings....thus the twin towers and the third building. This is my own opinion, I have never read this nor heard this anywhere. It is only my opinion/theory.