In 2001, I was living down near the world trade center, just a few blocks east on Maiden Lane - had been living there since 1995. I was knee deep in a project to photograph the downtown area at night - based on the template of the old New Amsterdam, when New York City was under Dutch rule. Same area photographed by Berenice Abbott in the 1930's.
I was busy trying to get pictures of old buildings around the financial district and the seaport that I figured would soon be gone. In the process, I tended to avoid the World Trade Center - it was the place I went on hot summer days to get good air conditioning, but I didn't think it was something I would have to make top priority on my soon to be gone list.