What is entailed in getting a 2 family re-zoned to a 3 family

[Kelly Arthur]

BP Family, I am putting an offer in on a nice 2 family in North Jersey. It's zoned as a 2 family and needs a lot of work but is in an area that gets good rents and a nice neighborhood. Since I'm already doing the work, in my opinion, it makes sense to put in the extra investment to renovate the roomy attic to make it a 1 bedroom or studio. I need to understand what would be required to have it legally zoned as a 3 unit and the non-construction related costs and the process (permits/legal, etc) to make the change.