At 2230 hours, Box 55-2 sent Company 55, Engine 59, Trucks 88, 91, Rescues 40, 59, 91-5, and Air 30 to 560 Eshelman Street for a structure fire. County Fire advised Chief 55 they received 2 calls reporting the back of the house on fire. PD on scene with smoke showing. Engine 55 and Chief 55-2 arrived with a 2.5 story, occupied, duplex with smoke and fire showing from the rear. The first alarm assignment requested at 2238hours bringing Engine 71, Truck 50, and Rescue 88 to the scene. 2 lines stretched into the fire building and a 3rd line into the exposure at 558 Eshelman Street. The bulk of the fire was knocked down in about 5 minutes with companies opening up and checking for extension. Primary searches negative. The fire was placed under control in 30 minutes.