WTC documented pre-wired for explosives?

WTC 7 collapse

FDNY Fire chief Daniel Nigro says further assessment of the damage indicated that it was severe:

The biggest decision we had to make was to clear the area and create a collapse zone around the severely damaged [WTC Building 7]. A number of fire officers and companies assessed the damage to the building. The appraisals indicated that the building's integrity was in serious doubt.

http://www.cooperativeresearch.org/entity.jsp?id=1521846767-634

Another fireman reported damage that progressed as the day wore on.

FDNY Deputy Chief Peter Hayden
Division 1 - 33 years

...also we were pretty sure that 7 World Trade Center would collapse. Early on, we saw a bulge in the southwest corner between floors 10 and 13, and we had put a transit on that and we were pretty sure she was going to collapse. You actually could see there was a visible bulge, it ran up about three floors. It came down about 5 o’clock in the afternoon, but by about 2 o’clock in the afternoon we realized this thing was going to collapse.

Firehouse: Was there heavy fire in there right away?

Hayden: No, not right away, and that’s probably why it stood for so long because it took a while for that fire to develop. It was a heavy body of fire in there and then we didn’t make any attempt to fight it. That was just one of those wars we were just going to lose. We were concerned about the collapse of a 47-story building there. We were worried about additional collapse there of what was remaining standing of the towers and the Marriott, so we started pulling the people back after a couple of hours of surface removal and searches along the surface of the debris. We started to pull guys back because we were concerned for their safety.

http://www.firehouse.com/terrorist/911/magazine/gz/hayden.html