Seriously, that building burned for six hours after being riddled with flying beams weighing hundreds of tons and assorted other burning debris. These set entire floors on fire. Unfortunately the collapse was shown on TV from the north side, where the fire wasn't, and as a result a lot of people think there was something mysterious/suspicious about #7 falling down. Here's the front of the building, seen from the river:
Now that's a bad fire and, from the angle of the sun, it was still early in the day.
My sister-in-law worked in WTC7. It was a harrowing few hours before anybody knew where she was.
That picture must have been taken even before the second tower fell. The Winter Garden was destroyed and the WFC heavily damaged after that.