At 23:19hrs the 20th run of the day was dispatched, a box alarm for the structure fire in the area of Altonbury and Murphy Rd. With a column in the distance Engine 22 arrived on scene reporting heavy fire from the rear of 1-story house converted to a business. As Engine 22 initiated an offensive attack, Truck 21 went to the roof, Engine 24 stretched a 2nd line and Battalion 21 assumed command. With Ladder 2 completing searches, Ladder 32 assumed the RIT assignment as crews knocked down the bulk of the fire resulting in the incident being placed under control. Following completion of assignments and assisting the SFMO Investigator all units returned to service.