N.Y.C. Admin. Code § 27-299: § 27-299 Limitations.

No buildings in those combinations of construction classes and occupancy groups prohibited by tables 4-1 and 4-2 shall be erected outside the fire districts. No building or space classified in occupancy group J-1 or J-2 may be located on a lot containing a building classified in construction group IE, IID or IIE. No building classified in construction group IE, IID, or IIE shall be located on a lot containing a building or space classified in occupancy group J-1 or J-2.