Box 367, Companies dispatched for a fire on the second floor of 635 Broad St. Dispatch advised they were taking numerous calls on the fire. Engine 8 went enroute with heavy black smoke in the air and transmitted the working fire before any companies were on scene. Engine 8 was first on scene, calling off a 4 story brick and confirmed a working fire. District 2 was in the area and took command of the fire, reporting a large 4 story brick OMD, with heavy fire showing from the 2nd floor D side. They also reported an immediate exposure issue to the D side. A 2nd alarm was requested due to the volume of fire and the size/occupancy of the building. Companies made an aggressive interior attack and had the main body of fire knocked down within 10 minutes, and continued to chase hot spots for about an hour.