Both buildings (North and South Tower) were 110 stories - at the time the highest that could be built - becasue water had to be pumped to the top floors for bathrooms and fountains - and pumps were not that strong/cost effective when they were completeld in the early 1970's.
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Two. (not quite)
Three towers fell that day. The two towers fell along with a 47 floor building (World Trade Center 7).