Station 26 and 56 were dispatched to 371 Campus Drive, Falcon Industries for a report of smoke coming from the rear of the building.  Car 26, Car 26B, Engine 26-3, Engine 26-1 and Haz Mat 26 responded.  Upon arrival the crew of E263 and DC Fredericks investigated the Divison C side of the building and discovered several liquid oxygen cylinders venting and creating a vapor cloud. Upon further investigation an odor of smoke was detected and light smoke was discovered from the rear bay door on Div. C.  OIC Chief Lipman requested a full district response and a RIT from station 27.  E261 dropped a supply line to E263 and a 2 1/2 line was stretched.  Crews forced the rear bay door and a heavy smoke condition was discovered throughout the building.  Interior crews discovered the fire in the back corner of the building involving a desk and other items.  The fire was extinguished without incident but the building required extensive ventilation.  The Franklin Township Fire Marshal's office is investigating the cause of the fire.