Do you know what the floor construction was? There has been a LOT of talk among firefighters about the manufactured I-joist construction
http://www.cdc.gov/niosh/fire/reports/face200707.html
http://www.fireengineering.com/articles/2007/04/silent-floors-silent-killers.html
http://youtu.be/Nc-IZhpIYwk
http://www.youtube.com/watch?v=60sgSPa5_w4
http://www.firedistrict7.com/tpdffiles/fire/td_WoodenI-Beams.pdf