How tough is to change a variance?

[Christopher Veljkovic]

BP community!! HAS ANYONE DEALT WITH THIS SITUATION?? HAS ANYONE HAVE EXPERIENCE CHANGING THE VARIANCE? I’m checking out a small multi family home in Essex County NJ ( great neighborhood btw), which the second floor apartment has 2 bedroom and the first floor has the potential to go from a 1 bedroom to a 3 bedroom. The catch is that the potential rooms are in the basement (which ceiling height is appropriate, ample amount of windows, and two possible egress options are available). How hard is it to change the variance? Thank you everyone! Your experience will greatly help my decision!