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Hello and welcome! My name is ***** ***** I will try my level best to help with your situation or get you to someone who can.
Does the lease make any reference to a working fireplace as an amenity included with the apartment?
Ok, then your recourse here is to simply send the tenant a notice that the fireplace is decorative and not safe to use and under no circumstances is a fire to be lit in it. I have a property with a similar issue, except I just don't want the tenants using the fireplace. So I notify them in writing that they are not functional and could cause a fire if they are used.
Then they are on notice to not use it and would be held liable if they violated the rule and some type of damage occurred.
But you don't have to get the tenant to agree...you just send them the notice since it is not necessary for you to provide a functioning fireplace unless it is stated in the lease.
You are very welcome. Glad to help. And as a landlord for over 26 years, even if the fireplaces were functional, I would probably tell them that they weren't as fires and tenants tend not to mix well..