At approximately 1539 hours the Box Alarm was transmitted for Calvin Ln bringing Engine 1 with 3 Communications stated they were getting multiple calls advising there was a fire on the first floor. Engine 1 arrived on the scene with fire from the roof of a one story single family. The Engine secured their own water supply and stretched the 200 ft to the Alpha side. Upon viewing the Charlie side, Engine 1's Officer noted fire from the Charlie side as well. Engine 1 advanced a line through the Alpha side to find significant fire on the interior. Chief 10 on board Engine 1 arrived, established the command and assigned FAPH Chief 9 as the Operations Supervisor. All units operated on the exterior, Units operated for approximately 3.5 hours before returning.