You may bring your own action against the landlord on the theory that the toxic mold and other broken items denied you your implied warranty of habitability. You must show that these matters actually prevented you from use of the property for this type of claim. If you prevail, essentially a set-off will occur between the value of rent for periods you were denied posession (not habitable) and the total amout of back rent owed by you. Good luck!
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You can also sue the landlord for any personal injuries suffered as a result of the black mold. You woulwant to consult with a personal injury attorney if so, since mold cases are difficult to prove. Good luck.
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