The nanothermite hypothesis is a very novel and imaginative idea - however clever it is, I don't think it's ever been used for controlled demolition in world history
There are some very well known examples of thermitic material being used for the purpose of CD. The skyride tower  and the remaining roof of the reichstag building  being two.
http://books.google.com/books?id=xd0DAAAAMBAJ&lpg=PA657&dq=Popular Mechanics thermite&pg=PA657#v=onepage&q&f=true
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