So frustrated with subletter trashed my apartment right now

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Illustrative scenario prepared by my practice.
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Hypothetical question

Quick background on my situation — any input appreciated.

subletter trashed my apartment. I've been dealing with this for about 8 months now and the situation isn't improving.

I have been in this property for 7 years. My monthly rent is $2,669. I have a written lease.

What's the typical outcome in situations like this?