To Burn or Not To Burn

To my surprise my top floor tenants had a fire going in their fireplace the other night when I went up to check on the amount of heat they were getting (another issue). It was my understanding that the fireplace didn’t work according to the last owner who sold me the building a year ago.
I’m a little afraid of the open fire even though they did have a screen.
Beyond that screen though was a shag rug.
I hardly use my fireplace because of fears that the building could go up.
Any opinions out there on whether one should allow your upstairs tenants use of their fireplaces?

By ez |