Further
If the tenant is storing flammable items e.g. cooking oil, on common property this could well breach the buildings insurance, in the event of a fire in this part of the building.
I am aware of a building that had a similar problem to the one you are describing with the addition of a fire. The OC had been trying for some time to get the commercial premises to move similar items out of common property and had been given some legal advice about the fire issues with end result that they had passed a by-law about storage on common property. I am not sure of the specific details, but the by-law did help with their insurance claim.
This was a nightmare situation for residents as they had to move out of their homes and deal with the damage.
What the #@## is your strata manager doing about this problem, your EC and OC need to mobilise fast on this one.
Good luck
Alley cat