12/24/06 04:56 East Farmingdale firefighters were alerted to respond to a working fire on Kean Street off Edison. Firefighters arrived to find a 50x75 commercial structure totally collapsed already, fully involved. Firefighters went into service with a deck gun, 2 1/2, & tower ladder master stream to knock down the fire. M/A was requested from West Babylon for R.I.T.