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I remember watching the building collapse on TV. A friend of mine worked at the SEC, which was in 7 WTC, so I was very interested in the scene. Number 7 came down IIRC around 5pm on 9/11. It appeared to have been weakened from the lower parts of the building, so that it collapsed almost like an accordion at the bottom, and then the rest of the building fell in from the impact. That's what it looked like at the time.
When those buildings were all up, they were pretty close together. #1 and #2 had a space between them, connected underground, but there wasn't that much space between #1 and #7, and there was a bridge across West Street extending out of #7 behind it. The Customs Service was in #7, too, IIRC.
All of this is a long way of saying that the fires could well have caused a straight-down collapse if they were on the floors in the lower half of the building. Remember, there was an electric substation there, too.
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