N.Y.C. Admin. Code § 24-126: § 24-126 Conditional approval of experimental installations and alterations.

The commissioner may grant a work permit, or an alternative form of approval, for an experimental installation or alteration on conditional approval if it appears likely from all of the information submitted that the installation or alteration when completed may satisfy the standards of section 24-125 of this code. The work permit shall be valid for a period not to exceed three years.