N.Y.C. Admin. Code § 27-255: § 27-255 Occupancy group F-1.

Shall include those buildings and spaces in which, during the major period of occupancy, the persons assembled comprise a seated or otherwise passive audience to a performance or presentation, and have their attention focused in a common direction or at a common subject. Occupancy group F-1 consists of two subdivisions F-1a and F-1b.

(a) Occupancy group F-1a. Includes buildings and spaces in which scenery and scenic elements are used.

(b) Occupancy group F-1b. Includes buildings and spaces in which scenery and scenic elements are not used.