Box 501 toned at 2041 hours sending Company 50, Engine 91-2, Tower 1, Rescues 40, 59, and 88 to Lucky Food Market for a structure fire. Reports indicated a fire involving a bed in an apartment above the store. Engine 50 arrived on side A with nothing showing. A line was stretched to the rear where crews made entry and were met with heavy smoke inside. A fire involving an air mattress on the second floor rear was quickly knocked down with negative extension. All occupants were able to safely escape.