"Deputy Fire Marshal Amy Linder said combustible materials near a heater started the accidental fire."

So, staff error caused this fire. Doesn't 4J train their staff on the handling of combustible materials and the obvious hazard of placing anything near a heater? Is there no check-list for closing at the end of the day to assure that the building will still be standing in the morning?

This sort of thing shouldn't need to be formalized, but sadly it does. People get weary at the end of a long day's work and it's easy for tired people to just mentally go home instead of doing that last bit of grunt work. 4J has a host of well-paid administrators. Perhaps that's where the training deficit begins.