Companies 11 & 10 were dispatched to the 4700 block of North 5th Street Highway for an AFA. Engine 11-1, Rescue 11, Engine 10 and Ladder 12 (in place of Ladder 10) responded. Captain 11 on scene investigating a water flow alarm. It was found that there was a partial building collapse within the property which activated a water flow alarm. Captain 11 had command. Crews confirmed there was nobody inside at the time of the fail. Utilities were notified as well as the Muhlenberg Twp Building Inspector. Once these agencies arrived and the conditions were under control, crews took up and returned @ 0219 hours.