Why does it matter?
The building was heavily damaged by falling debris from the collapsing Twin Towers, and had a weird lower steel structure that mean that a catastrophic failure was indeed possible. Firefighters didn't bother saving it, because the whole place was evacuated anyway - and a smaller, unoccupied building falling when thousands had been killed next door seemed neither here nor there. And in the echo-chamber of 24-hour news, one person saying that a building will fall can easily mutate into reports that a building has fallen. (Remember all the other wild, unsubstantiated tales going around that day? The skies were full of imaginary, hijacked aircraft...)

But why is it an utter lynchpin of the conspiracy theorists' tall tales that this building was demolished in some impossibly complicated government plot?
(Happy Idiot Talk now has an alibi for, Mon 7 Jul 2008, 18:38, Reply)