Not renewing inherited tenant's lease

[Eric Luzier]

Hi everyone,

I am soon closing on my first duplex in New Jersey, which I will be house hacking.  One of the units includes a tenant, whose lease ends on March 31st.  After the tenant's lease is up, I plan on moving into that unit, as the other unit will generate more income.  My question is: how do I go about notifying the tenant that I will not be renewing their lease?  Am I required to give a certain number of days notice?  Does this have to be in writing?  I have been searching around for this information, but have only been able to find laws regarding evictions so far.  Any information or insight is greatly appreciated!