Aggregate data from LL97 compliance calculator submissions — real numbers, not estimates.
The first LL97 compliance period sets emission limits based on building occupancy type. Most office buildings face caps around 4.53 kg CO₂e/sqft. Buildings exceeding their cap pay $268 per ton over. A typical 100,000 sqft office that's 30% over cap would pay roughly $40,000–$80,000 annually.
Starting January 1, 2030, caps drop approximately 40% for most building types, significantly expanding which buildings are non-compliant and by how much. Buildings that are barely compliant in 2024–2029 will often face significant penalties post-2030 without intervention.
Penalty = (Actual GHG emissions − Annual cap) × $268. For a building emitting 800 metric tons CO₂e against a 600 MT cap: (800 − 600) × $268 = $53,600/year in fines — every year until compliant.
Enter your building's square footage and energy use to see your exact penalty exposure in 2024 and 2030
Calculate LL97 Penalty →NYC Local Law 97 (LL97), part of the Climate Mobilization Act, requires buildings over 25,000 square feet to meet carbon emission limits starting May 1, 2024, with stricter caps in 2030 and 2035. Buildings exceeding their cap pay $268 per metric ton of CO₂e over the limit annually. It's the most aggressive building emissions law in the United States.
Buildings with a total floor area over 25,000 square feet. For buildings in a group owned by the same person and sharing tax lots, the threshold is 50,000 total square feet. There are some exemptions for affordable housing and buildings that meet certain renewable energy criteria.
The most effective strategies: (1) Electrification — switching from gas boilers to heat pumps significantly reduces carbon emissions; (2) Energy efficiency upgrades that reduce total consumption; (3) Renewable Energy Certificates (RECs) from NYC Clean Energy; (4) Property Assessed Clean Energy (PACE) financing for large upgrades. A compliance plan built around a professional energy audit typically identifies the highest-ROI path to compliance.
Unpaid fines accrue interest and can become liens on the property. As of 2024, the NYC Department of Buildings has begun issuing violations and the enforcement mechanism is operational. Building owners should not assume fines will be waived — the compliance pathway must be planned now for 2030.