E-41 arrived o/s reporting a 2 story mor 16 x 60 Heavy fire both floors placing all hands in svc. B/C-11 arrived and placed all hands on an exterior attack. Dep-1 requested the 2nd alarm for heavy fire with a partial collapse of the rear of the fire bldg, They had extension into the "B" exposure. Special call for Snorkel-5 who was placed into service in the front of the bldg.