Real Estate Law
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Ok, at this point, your best and fastest recourse is to contact the local Code Enforcement or Housing Inspector's office and ask them to come out and inspect the property. This could be a serious structural issue that makes the entire dwelling dangerous to live in because it could give way at any time.
The inspector can cite the owner for any violations due to his failure to make repairs so it is structurally safe and secure and force him to repair it or face daily fines after a deadline date.