N.Y.C. Admin. Code § 27-306.1: § 27-306.1 Measurement; solar thermal and solar electric (photovoltaic) collectors and/or panels and their supporting equipment.

Notwithstanding any inconsistent provision of section 27-306 of this code, solar thermal and solar electric (photovoltaic) collectors and/or panels and their supporting equipment that exceed 33 and one-third percent of the area of the roof of the building upon which they are erected shall not be included in the height of a building or considered an additional story.