The World Trade Center was destroyed by jets crashing into it, absolutely not by controlled demolition.

If you consider crashing a passenger airplane randomly into a very tall structure.... Then yes it was. (JK, no it was not a controlled demolition, it was unexpected and random)

No. The world trade center collapsed due to the weakening of the interior structure of the towers

Whomever ordered the installation of controlled demolition devices in the Twin Towers and WTC 7. See:

http://www.foreignpolicyjournal.com/2011/02/14/a-scientific-theory-of-the-wtc-7-collapse/

The south tower of the world trade center collapsed at 9:59am