Uses for Stable/Garage

I am looking at buying a house that has a freestanding structure in the back yard (formerly stable) now being used as a garage. It is a separate lot zoned on property shark as R6B. It is in the backyard accessible by a driveway shared by the adjacent house. (Easement on the driveway) Does anyone know the legal uses of such a structure? Can you convert it into a living space? Can you use it (legally) as a work space? Any experiences/knowledge with this subject would be appreciated.

(Brooklyn)

By hoffster |