NYC/Queens Multifamily Homes - Attic Bedrooms

[Sonia Chopra]

Hi All, I am trying to figure out what the general rules are when it comes to bedrooms in the attic for a multifam in NYC. I've seen a few 2 fam houses (one I'm currently looking at) that were advertised as 3 bedrooms in the second floor unit. The setup was 1 bedroom on the actual second floor, then walk up to the attic and that's where the other 2 bedrooms were. If the house was built this way, would those two bedrooms in the attic be considered illegal? In other words, is there always a permit needed to use the attic rooms as legal bedrooms? 

[Sonia Chopra]

@Kevin Paulk thank you! I was thinking it was the same as a basement where you have to legally add it as a space by obtaining the necessary permits. I almost can't believe it's not as complicated but good to know! Thank you!