Legal 2 family in NJ, rented as 3 family. Ramifications?

[Vanessa Francis]

Hi Everyone, Newbie here! I am in the process of buying a legal 2 family house that is already set up as a 3 family over 3 floors in northern NJ. It is a no-brainer to turn it into a 3 family, though the utilities set up is weird and will have to be addressed, but what are the ramifications legally of using and renting it as a 3 family before it is legally designated as such?