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Tower 7 fell like the twin towers did. But it wasnt hit.
If I remember correctly, I read somewhere that the building 7 was connected to the towers underground. That might have dealt damage to the structure with the fires and impacts. I have no idea if that is why building 7 fell, but it was a theory.
Much of the debate around the twin towers falling was the effects of how hot jet fuel can burn and its effect on the steel structure, with engineers concluding while it wouldnt melt, it would weaken the already damaged structure enough for it to collapse.
But again, no planes hit Tower 7, there was no jet fuel, and no damaged structure, making it a skyscraper collapsing purely by fire, which has never happened in the history of skyscraper fires.
That's because normally they're seen to by firefighters, but this one was left to burn for about 7 hours (as its was empty and their efforts were obviously elsewhere)