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I am sorry to hear about this situation.
1) First of all, understand that with few exceptions, a landlord is not responsible for actions of his tenant! Thus, this suit may fail. You are likely better off filing a lawsuit against the tenant themselves for nuisance.
2) If you are asking for more than $15,000, then this would be filed in the Law Division of the Superior Court. If so, then the Court allows collecting legal fees and (reasonable) attorney costs if you win at the Judge's discretion, by adding it to judgment, under RULE 4:42-8 et seq.
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