Local Law 97 of 2019, codified at Admin Code section 28-320, sets carbon emission limits for buildings larger than 25,000 square feet, with the first compliance period running 2024 to 2029 and steeper caps phased in through 2050.
Local Law 97, part of the Climate Mobilization Act, requires roughly 50,000 NYC buildings over 25,000 gross square feet to meet greenhouse-gas intensity limits set by Department of Buildings rules at 1 RCNY 103-14. The 2024 to 2029 limits target the highest-emitting 20 percent of properties, while 2030 to 2034 limits sweep in most large buildings. Owners must file an annual emissions report by May 1 prepared by a registered design professional. Affordable housing, houses of worship, and certain hospitals follow alternative pathways under Admin Code section 28-321. Greenhouse-gas coefficients for utility electricity, district steam, and on-site fuels are set annually by DOB.
Exceeding the cap costs $268 per metric ton of CO2 equivalent above the limit. Failing to file the annual report carries $0.50 per square foot per month, and false statements expose owners to misdemeanor charges.
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