N.Y.C. Charter § 224.2: Section 224.2. Required energy conservation projects in city buildings.

a. Definitions. For the purposes of this section, the terms "base building systems", "city building", "energy audit", "energy efficiency report", and "simple payback" shall have the same meanings as defined in section 28-308.1 of the administrative code.

b. No later than one year after the submission, in accordance with article three hundred eight of chapter three of title twenty-eight of the administrative code, of an energy efficiency report for a city building, reasonable capital improvements to the building's base building systems that are recommended in the building's energy audit shall be completed, including, at a minimum, all those improvements of the base building systems having a simple payback of not more than seven years or capital improvements that, when combined, would equal or exceed the overall reduction in energy consumption of such recommended capital improvements having a simple payback of not more than seven years.

c. The mayor shall promulgate rules as may be necessary to carry out the provisions of this section.