Local Law 97 compliance applies to most New York City buildings over 25,000 gross square feet, and it comes down to two obligations: file an annual greenhouse gas emissions report certified by a licensed design professional, and keep your building’s emissions under the cap set for its occupancy group. Miss the cap and you owe $268 for every metric ton of CO2 equivalent over the limit. Miss the filing and you owe $0.50 per square foot for each month you’re late. The first reports, covering calendar year 2024, were due December 31, 2025, and about 93% of covered private properties filed on time.1NYC.gov. New Compliance Data Shows Impact of Local Law 97
Which Buildings Are Covered
A building falls under LL97 if it exceeds 25,000 gross square feet according to the Department of Finance’s tax records. That square footage number is the one that matters for coverage, not the figure on your certificate of occupancy or your architect’s drawings.2NYC Department of Buildings. LL97 Greenhouse Gas Emissions Reduction
Two or more buildings on the same tax lot are covered if they collectively exceed 50,000 gross square feet. The same rule applies to condominiums governed by a single board of managers.
Some property types are exempt: detached one- to three-family homes, power plants, and certain industrial facilities. City-owned buildings follow a separate compliance track and aren’t governed by the rules described here.
Two Compliance Tracks: Article 320 and Article 321
The law splits covered buildings into two groups, and which article applies to yours determines what compliance actually looks like.
Article 320 covers market-rate buildings. These properties have to meet a specific annual emissions cap measured in metric tons of CO2 equivalent. Exceed the cap and you either pay the $268-per-ton penalty or use one of the alternative pathways described below.3NYC Accelerator. Local Law 97
Article 321 covers affordable housing and houses of worship. Instead of hitting a numerical cap, these buildings can follow a prescriptive checklist: complete 13 specific energy conservation measures (or document why particular measures don’t apply) and have the work certified by a qualified retro-commissioning agent. An Article 321 building can also choose to comply under Article 320’s emissions-cap approach if that works better for its situation.
Your Emissions Cap and How It’s Calculated
Each Article 320 building has its own annual cap. You calculate it by multiplying the gross square footage in each occupancy group by that group’s emissions intensity limit. Different uses get different limits because a hospital uses far more energy per square foot than a warehouse does. For mixed-use buildings, you run the calculation separately for each occupancy group and add the results.4The City of New York. Local Laws of the City of New York for the Year 2019 No. 97
The 2024–2029 intensity limits (metric tons of CO2 equivalent per square foot) include 0.00675 for Group R-2 residential, 0.00846 for Group B office, 0.01181 for Group M retail, 0.00987 for Group R-1 hotels, and 0.02381 for hospitals and labs. Storage and utility uses sit lowest at 0.00426. In practical terms, a 100,000-square-foot residential building has a 675-ton annual cap during this first period; the same-size office building gets 846 tons.
Your actual emissions aren’t measured at a smokestack. You add up every energy source your building consumed during the calendar year and multiply each by a standard emission coefficient published by the Department of Buildings. For the 2024–2029 period, grid electricity carries a coefficient of 0.000288962 tCO2e per kWh, natural gas is 0.00005311 tCO2e per kBtu, Fuel Oil #2 is 0.00007421 tCO2e per kBtu, Fuel Oil #4 is 0.00007529, and district steam is 0.00004493.5The City of New York. Local Law 97 Emissions Coefficients
Compare your total emissions to your cap. The difference, if you’re over, is what gets multiplied by $268.
Pay attention to what happens in 2030. The residential R-2 intensity limit drops from 0.00675 to roughly 0.00335, essentially cutting allowable emissions in half. The grid electricity coefficient also drops to 0.000145 tCO2e per kWh, reflecting expected grid decarbonization, while gas and fuel oil coefficients stay flat. Electrifying your systems becomes progressively more valuable, and buildings that comfortably clear the 2024–2029 caps may need serious retrofits to stay under the 2030 limits. Major projects can take two to three years from engineering through completion, so the planning window is now.
Filing the Annual Emissions Report
Reports are submitted through the DOB NOW: Safety portal and cover the previous calendar year. You’ll pull data from utility bills and fuel delivery records for every energy source the building consumed: grid electricity, natural gas, fuel oil, and district steam.2NYC Department of Buildings. LL97 Greenhouse Gas Emissions Reduction
A Registered Design Professional, meaning a licensed architect or professional engineer, has to certify the report before it’s submitted. The RDP verifies that consumption figures match utility records, confirms the building’s gross square footage, and checks that occupancy group classifications are correct. The Department of Buildings publishes official reporting templates that convert consumption into metric tons of CO2 equivalent using the current coefficients. A filing fee is required to finalize the submission.
The first reports were due December 31, 2025, and about 28,000 buildings met that deadline.1NYC.gov. New Compliance Data Shows Impact of Local Law 97 Confirm future annual deadlines directly with DOB, since the city has adjusted timelines through its rulemaking process.
If your building is covered by LL97, it’s almost certainly also covered by NYC’s benchmarking law, Local Law 84/33, which requires annual energy reporting through ENERGY STAR Portfolio Manager. The benchmarking filing is separate but draws on the same utility data, and having it on file is a prerequisite for claiming good faith efforts if you go over your emissions cap.
Penalties
The core penalty is $268 per metric ton of CO2 equivalent above your annual cap.3NYC Accelerator. Local Law 97 A building 100 tons over the limit owes $26,800 for that year, and the penalty recurs every year the building stays over. There is no one-time fine that clears the problem.
Not filing at all is treated separately: $0.50 per square foot for each month the report is late. For a 100,000-square-foot building that’s $50,000 a month. Roughly 1,400 properties missed the December 2025 deadline and are now facing enforcement through the Office of Administrative Trials and Hearings. DOB has started mailing Notices of Deficiency giving those owners a 60-day window to file late reports and potentially avoid the full penalty.1NYC.gov. New Compliance Data Shows Impact of Local Law 97
Submitting false information is the most serious violation, carrying potential criminal charges and fines up to $500,000. The entire framework relies on accurate self-reporting, and the city has been explicit about treating data integrity as non-negotiable.
If You Can’t Meet the Cap
Going over your emissions limit doesn’t automatically mean paying the full penalty. Article 320 buildings can request penalty mitigation by demonstrating good faith efforts toward compliance.6The City of New York. Article 320 Penalty Mitigation
Three filings have to be in place before you can even ask: your LL97 emissions report for the year in question (with any approved adjustments), your LL84 benchmarking report for the same year, and your one-time LL88 lighting and submetering report.
Then you need to show at least one qualifying condition: the building complied in the prior year and circumstances have changed; retrofit work is actively underway; you’re waiting on the utility to deliver more electrical capacity; or your building is a critical facility with unusual constraints. Unexpected events like a fire or major system failure can also support mitigation. Documentation carries the process; verbal assurances don’t reduce penalties.
Two other pathways can close part of the gap. Renewable energy credits offset some emissions, but the RECs must come from qualifying projects that meet source requirements set by the city’s rulemaking. Carbon offsets are capped at 10% of your building’s total annual emissions limit, not 10% of the excess. The city’s third rulemaking package, finalized in December 2024, created a new offset mechanism through the Affordable Housing Retrofit Fund. AHRF offset certificates cost $268 per ton, the same rate as the penalty, but buying them counts as compliance rather than a violation and keeps your building’s record clean. The proceeds fund electrification in affordable housing.3NYC Accelerator. Local Law 97
Some buildings can also apply for adjustments based on specific hardship or unusually high-density occupancy through DOB’s adjustment application process, submitted with the help of a Registered Design Professional.
Paying for the Work
The hardest part of compliance is usually cash. NYC’s Property Assessed Clean Energy program provides long-term, fixed-rate financing that covers up to 100% of project costs with no upfront money from the owner. Repayment runs through a charge on the property tax bill, and the obligation transfers with the building if you sell.7NYC Accelerator. NYC PACE Financing
PACE is available for multifamily buildings with three or more units, commercial and industrial properties, and buildings owned by tax-exempt organizations, including religious institutions. The property must be current on taxes, civil penalties, and other city debts. Eligible improvements include high-efficiency boilers and chillers, heat pumps, envelope work, solar installations, and related soft costs like energy audits. As of 2024, PACE also covers new construction and major renovations that result in all-electric buildings, and retrofit projects that achieve full electrification are pre-qualified, skipping the savings-to-investment ratio requirement that applies to other projects.
On the federal side, the Section 179D deduction for energy-efficient commercial buildings ranges from $2.50 to $5.00 per square foot for projects meeting prevailing wage and apprenticeship requirements, and from $0.50 to $1.00 per square foot without them. Inflation-adjusted 2025 figures run up to $5.81 per square foot at the top tier.8Department of Energy. 179D Energy Efficient Commercial Buildings Tax Deduction The deduction expires for any property where construction begins after June 30, 2026.9Office of the Law Revision Counsel. 26 USC 179D – Energy Efficient Commercial Buildings Deduction For a 200,000-square-foot office building at the maximum savings tier with prevailing wages, the deduction can exceed $1 million, which meaningfully changes the math on a compliance retrofit.
NYC Accelerator offers free technical assistance to any city building larger than 5,000 square feet. A dedicated account manager helps identify energy projects, financing options, and incentives, and helps navigate compliance deadlines.10NYC Accelerator. Technical Assistance For buildings that will need real retrofit work to survive the 2030 caps, the Accelerator team can help sequence the high-impact moves: electrifying heat and hot water, upgrading the envelope, replacing HVAC with high-efficiency equipment, and adding on-site renewables.