Inherited Tenant on 1st Rental Property

[Gabriel E. Galloza]

I purchased a Duplex with an inherited tenant that signed a 7 year lease expiring October 2021. The property closes next week, and i find out today that the tenant is also purchasing a home, and he will be vacating the property, ultimately breaking the lease. Would it be ethical, and lawful as a Landlord in my position to Keep the Security Deposit? The unit is also distressed, and needs a makeover, i just cant prove he caused the distress. Property is located in NJ. Any Suggestions, stories, etc are greatly appreciated!

With Best Regards,

Gabriel