Local Law 97 sets strict carbon emission caps on large NYC buildings. Owners who miss the mark face automatic fines starting at $268 per metric ton over the limit — every single year.
Passed as part of the NYC Climate Mobilization Act in 2019, Local Law 97 is one of the most ambitious building emissions laws in the world. It sets annual carbon emission caps for large buildings — and stiffens them over time to push the city toward carbon neutrality by 2050.
Unlike voluntary green programs, LL97 is enforced automatically. Buildings that exceed their annual cap receive a penalty bill — no hearing required.
Buildings over 25,000 sq ft, or multiple buildings on the same tax lot totaling over 50,000 sq ft. Roughly 50,000 NYC properties are subject to the law.
Each building's annual cap (in metric tons of CO₂e) is based on its occupancy type and gross floor area. Residential, office, retail, hospital, and other uses each have different rates.
All energy consumed in the building — natural gas, fuel oil, steam, and electricity. The NYC Department of Buildings uses LL84 benchmarking data to calculate your actual carbon output.
$268 per metric ton over your building's annual cap. There is no cap on the penalty — a building significantly over the limit can face six-figure fines every year.
The law tightens in phases. Buildings that are compliant today may not be compliant in 2030 without upgrades. The time to act is now — retrofits take time and budget cycles.
NYC Mayor signs the Climate Mobilization Act. Local Law 97 is now in effect, giving owners a compliance runway to plan retrofits and upgrades.
Emissions from calendar year 2024 are evaluated against the first-period caps. Penalty notices are issued in 2025 for any building exceeding its cap. This is happening now.
The 2030–2034 period introduces substantially lower emission limits for nearly every occupancy type. Buildings compliant today will need further upgrades to stay within bounds.
Caps tighten again. Buildings reliant on fossil fuels will face mounting pressure without meaningful electrification or efficiency upgrades.
The law's ultimate goal: a carbon-neutral NYC building stock. Properties reaching this era with outdated systems face the steepest penalties.
There is no grace period. Once the DOB calculates your building's actual emissions against your annual cap, any overage triggers a fine. A 100-ton overage = $26,800 per year. A 500-ton overage = $134,000 per year. Building owners can't appeal emissions math — only proactive compliance avoids the bill.
Rates are in metric tons of CO₂e per square foot per year. Multiply your gross floor area by your occupancy rate to get your annual building cap.
* Rates sourced from NYC Local Law 97 of 2019 (Int. 1253-A). Actual caps depend on building use mix — consult a qualified energy engineer for a formal compliance analysis.
Build Nexus pulls live data from NYC Open Data and the DOB systems to give you a real-time view of your building's compliance posture. No manual lookups. No spreadsheets. No surprises.
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