Lizzie (talking about WTC 7): "I still find it very hard to believe that Building 7 fell down in exactly the same way.

It was on fire from the morning to the time it collapsed at 17:20.

The Southwest corner of the building was bending outwards (pulling away the support for the floors) from 14:00 onwards and that's why the firefighters abandoned it at 15:30 - because they could see it was going to collapse.

Just like the WTC towers, fire weakened the steel support structure and left floors unsupported. It was exacerbated by impact damage (from falling debris). Eventually one or more floors collapsed causing a cascade failure.

Like I say, that is how and wht any (and all) tall building(s) will fail if a fire burns long enough and/or if there is sympathetic structural damage.