Two or three days before the attacks, they showed on the news the Northern Alliance (led by Ahmed Shah Massoud) shelling the Taliban in Kabul. During these attacks, Ahmed Shah Massoud was assassinated. Gary said, "They're planning something big." (Meaning al-Qaeda). We found out the next day that Massoud was assassinated, and Gary said, "They're planning something very big."
Gary and I work on "Wall Street" (physically our offices were in Midtown), and we were heading into the city 2 - 3 days a week back then (it was becoming easy to telecommute).
We were supposed to head in that morning, but Gary wasn't feeling too hot and just "had a feeling" we shouldn't drive in. We turned on CNBC before the morning meeting. We were watching when they first reported the first tower was on fire. The first thing Gary said was, "Holy sh**, it's a planned attack." They replayed the footage, and there was clearly a plane that flew into the tower. It wasn't too long after that they caught the next plane flying into the other tower.
The towers were burning and he said, "they're going to come down." It was horrible knowing rescue crews were heading to and into the buildings to help, because Gary is always right about these things.
None of our friends at Morgan Stanley (thankfully) worked at that address, they were midtown. But we had many good friends at the Alger Funds, and had had dinner with one (who lost her life in the attack) just the week before.
We worked for Gruntal in 1999 and part of 2000, and had offices at One Liberty. Thankfully, our friends there all survived. I'm a C.F.A. and a member of the New York Society of Security Analysts, and the NYSSA had its offices there. Thankfully they were on a lower floor and everyone made it out.
As soon as the plane flew into the second tower, we put in VHS tape. We taped for days. Neither one of us wanted to watch them again, however. We gave them to a friend that is an avid collector of 9/11 stuff. Too gruesome, too sad, for us.