N.Y.C. Admin. Code § 28-504.3: § 28-504.3 Foldable bicycle access.

It shall be unlawful for an owner of a building the main occupancy of which is offices that are classified in occupancy group B to bar a tenant or subtenant from transporting a foldable bicycle to or from such tenant or subtenants space on a passenger elevator, provided that such bicycle is fully folded. For purposes of this section, the term "foldable bicycle" means a bicycle designed to fold into a compact assembly not exceeding 20 inches (508 mm) by 36 inches (914 mm) by 32 inches (813 mm).