you need to file a NJ non-resident return reporting only the rental property located there
Who Must File a New Jersey Income Tax Return
You must file a return if – and your gross income from
everywhere for the entire year was
your filing status is: more than the filing threshold:
Single or
Married/CU partner, filing separate return $10,000
Married/CU couple, filing joint return
Head of household
Qualifying widow(er)/surviving CU partner $20,000
