What was initially a 2 alarm fire has been upgraded to a 3 alarm at an industrial building on Six Points Road.
The blaze broke out at North Fish Company just before 7:30, Saturday morning.
Toronto Fire says crews set up an aerial to attempt an interior attack but heat and flames drove firefighters out and withdrew to an offensive attack.
The southeast corner of the building is beginning to collapse and live power lines are starting to come down.
Roughly 16 Fire trucks have been called to the scene.