At 1408 hours Station 9(California) and Station 7(Hollywood) were dispatched mutual aid to Solomon's for the report of smoke in the building. Engine 73 and Rescue Squad 7 responded with a total of 8 volunteers with Engine 92 and Tower 9 to the Calvert Box. Engine 73 arrived on the scene at 1415 hours Side A of a Middle of the Row Commercial Building with nothing showing from the outside and the next Engine to pick up the line at the hydrant. The crew from Engine 73 ran a line to the front door and started to investigate. Calvert Engine 34 arrived next with Engine 73's line. Rescue Squad 7 arrived at 1420 hours and positioned on Side A as the first arriving special service. Lieutenant Mattingly reported to have a light haze in the building and requested the Thermal Imager from the Squad. The Squad crew secured the power and vented the building while the Engine Company continued the search for the cause. Command held Solomon's Engine 34 and the Hollywood units and returned the rest. Units found a possible malfunctioning heater and all units cleared the scene at 1447 hours. Solomon's Chief 3 had the 302 command.