N.Y.C. Admin. Code § 27-396.6: § 27-396.6 Applicability.

Emergency power systems meeting the requirements of this article shall be provided in the following buildings and building sections:

(a) High rise buildings and building sections classified in occupancy group C, E, G or H.

(b) Buildings and building sections classified in occupancy group E or G which do not exceed seventy-five feet in height but have a gross area of over fifteen thousand square feet per floor or a total gross area of one hundred thousand square feet or more.

(c) Spaces classified in occupancy group F-4 having an occupant load of three hundred or more persons.

(d) Buildings and building sections classified in occupancy group J-1.

(e) Buildings and building sections containing an atrium.