At 0009hrs the box alarm was transmitted for the 4100blk of 51st street in company 809’s first due for smoke in the building. Engine 331 and tower 33 responded on the initial dispatch as 4th due engine and 3rd due special service. Once on scene Engine 331 stretched the 400, and the tower set up RIT on side alpha. Engine 809 located a fire in a top floor bed room and the working fire dispatch was sounded brining engine 332 to the scene who assisted in securing water supplies and stood by with the tower crew.