N.Y.C. Admin. Code § 27-521.13: § 27-521.13 Fire protection equipment.

(a) Smoke detectors. Smoke detectors meeting the specifications of section 27-981 of article six of subchapter seventeen shall be located at the ceiling and adjacent to each return air intake.

(b) Standpipes. At least one standpipe outlet shall be installed in every mall.

(c) Sprinklers. An automatic wet sprinkler system shall be installed in every mall.

(1) All spaces with openings between such spaces and a mall shall be fully sprinklered in accordance with subchapter seventeen of this chapter and reference standard RS 17-2 regardless of floor area or occupancy classification.