Building #7
About 90 minutes before it fell, [Fire Chief Daniel said he and other chiefs decided to get out. “We believed from observations inside and out that there was structural damage,” he said. The building had been hit by debris from the collapse of the north tower, 300 feet away. Fires roared.
His account is backed up in two ways. First, in oral histories, firefighters and commanders described retreating from No. 7 because of the expected collapse. Second, photographs taken from a police helicopter show that a large chunk of the bottom of the building had been destroyed by debris from the north tower; a comprehensive study by Popular Mechanics magazine concluded that along the bottom 10 floors, a quarter of the south face was knocked away.
http://www.nationalreview.com/corner/rosie-odonnell-still-pushing-9-11-conspiracy-theory/