If you own or manage a New York City building over 25,000 square feet, Local Law 97 compliance means two things: filing a certified annual emissions report with the Department of Buildings by May 1 each year, and keeping your building’s carbon output under an occupancy-based cap that gets substantially tighter in 2030. Miss the cap and you pay $268 for every metric ton of CO₂ equivalent over the limit. Miss the report and you pay $0.50 per square foot every month until you file.1NYC Department of Buildings. LL97 Greenhouse Gas Emissions Reduction The first reports, covering 2024 emissions, were due May 1, 2025.
Is Your Building Covered
Local Law 97 reaches three categories of buildings, based on gross square footage recorded with the NYC Department of Finance:1NYC Department of Buildings. LL97 Greenhouse Gas Emissions Reduction
- Any single building over 25,000 gross square feet.
- Two or more buildings on the same tax lot that together exceed 50,000 gross square feet.
- Two or more condominium buildings governed by the same board of managers that together exceed 50,000 gross square feet.
When multiple buildings share a tax lot and cross the 50,000-square-foot threshold, every building on that lot becomes subject to the law, and each one complies independently based on its own characteristics. Compliance started in 2024 for most covered buildings, 2026 for others, and 2035 for a final group. The Department of Buildings publishes a Covered Buildings List each year reflecting its records as of March, so you can confirm whether your property is included and which compliance pathway applies. If the listed data is wrong, you can submit a correction through the reporting portal for DOB review.
Which Compliance Pathway Applies
Covered buildings fall onto one of two tracks, and which one you’re on changes everything about what compliance looks like.
Article 320: Emissions Caps
Most covered buildings are on Article 320. This is the track with the hard annual carbon caps and the per-ton penalties. Commercial office buildings, market-rate residential towers, hotels, hospitals, and retail properties all follow this path.
Article 321: Prescriptive Measures
Buildings with at least one rent-regulated unit and houses of worship follow Article 321 instead.2NYC Department of Buildings. LL97 Compliance Report (Article 321) These owners choose between meeting the 2030 emission limits through a performance-based approach, or implementing a list of 13 prescribed energy conservation measures. The prescribed measures are practical upgrades like adjusting heating and hot water set points, repairing steam traps, insulating pipes and tanks, installing boiler controls and heating sensors, weatherizing, and upgrading common area lighting to current energy code standards.3NYC Accelerator. Prescriptive Pathways A retro-commissioning agent must review the building and attest the applicable measures have been completed. Four of the 13 measures require detailed documentation; the remaining nine need only a signed attestation. For rent-regulated buildings, where capital improvement pass-throughs to tenants are constrained, this prescriptive route is a meaningful alternative to the cap-and-penalty regime.
What the Emission Caps Are
Article 320 caps are expressed as metric tons of CO₂ equivalent per square foot, and they vary by occupancy group under the NYC Building Code. A hospital is allowed more than an office; storage and factory spaces are allowed less. The caps also tighten in two phases.
The 2024–2029 Limits
The first compliance period runs January 1, 2024 through December 31, 2029. Two of the most common limits during this window:4UpCodes. New York City General Admin. Provisions 2022 – Building Emissions Limits
- Group B (office/business): 0.00846 tCO₂e per square foot.
- Group R-2 (residential multifamily): 0.00675 tCO₂e per square foot.
Healthcare facilities, emergency response buildings, and laboratories get higher allowances reflecting their energy intensity. These first-period limits are set to catch the worst-performing roughly 20 percent of buildings while leaving average buildings some room.
The 2030–2034 Limits
The caps drop sharply in the second compliance period:5UpCodes. Building Emissions Limits for Calendar Years 2030 Through 2034
- Group B: 0.00453 tCO₂e per square foot, a 46 percent cut from the 2024 limit.
- Group R-2: 0.00407 tCO₂e per square foot, a 40 percent cut.
For a 200,000-square-foot office building, the Group B allowance falls from roughly 1,692 metric tons annually to about 906 metric tons. That gap generally cannot be closed through operational adjustments alone. Major retrofits like electrifying heating, upgrading the building envelope, and installing heat pumps become part of the plan.
How Emissions Get Counted
Annual emissions are calculated by multiplying each energy source the building consumes during the calendar year by its assigned carbon coefficient. Natural gas, fuel oil, district steam, and grid electricity each have a specific emissions factor. The electricity coefficient reflects the carbon intensity of the grid serving New York City and changes over time as the grid gets cleaner. For a mixed-use building, the limit is calculated by applying each occupancy group’s cap to its share of the square footage, then adding the allowed emissions together. Occupancy classification matters: misclassified space can push a building over its limit or waste compliance headroom.
Filing the Annual Report
Every covered building files an emissions report with the Department of Buildings by May 1, covering energy use during the previous calendar year.1NYC Department of Buildings. LL97 Greenhouse Gas Emissions Reduction You’ll need 12 months of consumption data for every fuel and utility serving the building. Most owners organize this through ENERGY STAR Portfolio Manager, the EPA’s benchmarking tool, which tracks monthly utility bills and fuel deliveries. The data has to accurately reflect total gross square footage, occupancy group classification, and any on-site generation like solar.
A Registered Design Professional, meaning a licensed architect or professional engineer, must review the data and certify the report before filing.1NYC Department of Buildings. LL97 Greenhouse Gas Emissions Reduction Reports are submitted through the BEAM portal at nyc.beam-portal.org. Filing fees:6NYC Department of Buildings. Local Law 97 Combined and Aggregate Reports
- Standard Article 320 report: $210.
- Complex Article 320 report (deductions, alternative calculations, combined filings): $615.
- Article 321 compliance report: $210.
- Good faith mitigation filing: $950 on top of the regular fee.
What Non-Compliance Costs
The penalty structure is designed to make compliance cheaper than ignoring the law.
A building that exceeds its annual emission cap pays $268 for every metric ton of CO₂ equivalent over the limit, assessed every year the building remains over.7NYC Department of Buildings. Local Law 97 Compliance, Resources and Understanding Requirements A 500,000-square-foot office exceeding its 2024–2029 limit by 1,000 metric tons owes $268,000 a year, and the exposure grows once the tighter 2030 caps apply.
Missing the May 1 report deadline triggers a separate $0.50 per square foot per month penalty, which keeps accumulating until the certified report is successfully filed. On a 100,000-square-foot building, that’s $50,000 for every month of delay.
Knowingly filing a materially false report is a different category of problem. It’s a misdemeanor, punishable by a fine of up to $500,000, up to 30 days of imprisonment, or both. A separate civil penalty of up to $500,000 can also be imposed.8American Legal Publishing. NYC Administrative Code 28-320.6.3 False Statement The entire enforcement structure depends on accurate self-reporting, and the penalties for falsifying it reflect that.
Credits That Lower Your Emissions Number
Beneficial Electrification
Replacing fossil-fuel heating, hot water, or cooling equipment with high-efficiency electric alternatives like heat pumps generates a credit against the building’s emissions total. The electricity consumed by the new equipment gets multiplied by a negative emissions coefficient, effectively subtracting from the building’s reported output.9NYC Accelerator. Beneficial Electrification
The incentive is front-loaded. Qualifying equipment installed and operating before January 1, 2027 earns a double credit of −0.00130 tCO₂e per kWh consumed. Equipment installed between January 1, 2027 and December 31, 2029 earns the standard −0.00065 tCO₂e per kWh. Equipment installed after 2029 doesn’t qualify, and the credits expire after reporting year 2035. If the credit isn’t needed in the year it’s generated, savings can be banked, but the rules are tight: each banked year’s savings can only be applied to a single future year, and multiple banked years cannot be combined in one report. There’s no separate application; the credit flows through the regular LL97 report.
Renewable Energy Credits
Renewable Energy Credits can offset a portion of emissions attributed to grid electricity, with meaningful restrictions. Only RECs tied to renewable energy located in or directly feeding New York City qualify, specifically the Tier 4 RECs associated with new transmission delivering clean power to the city. Tier 4 RECs are projected to become available in 2026. RECs can only offset electricity-related emissions, not on-site natural gas or fuel oil combustion, and a building cannot meet its limit solely through REC purchases. Owners who submit a decarbonization plan under good faith mitigation are barred from using RECs during the entire first compliance period (2024–2029).10NYC Department of Buildings. Renewable Energy Certificate Policy for Local Law 97
Good Faith Mitigation If You Can’t Hit the Cap
Owners making concrete progress toward compliance who cannot meet the 2024 limits yet can pursue penalty mitigation. It isn’t automatic. The building must already be fully compliant with related laws, including benchmarking under Local Law 84, lighting and submetering upgrades under Local Law 88, and the LL97 annual report itself. Owners who clear those prerequisites can pursue mediated resolution with DOB through one of several routes:
- DOB-approved permits for retrofit work sufficient to meet the 2024 limit, or signed service provider contracts for non-permit work.
- Contracts in place with Con Edison for electrical service and panel upgrades needed to support building-wide electrification.
- A decarbonization plan showing a path to net-zero carbon by 2050, including an energy audit, equipment inventory, timelines, financing, and projected reductions. This option temporarily relieves penalties but bars REC use during the first compliance period, requires completing work to meet the 2024 limit within 24 months, and requires approved DOB applications for 2030-compliant work by 2028.
If an owner fails to meet the milestones in a good faith submission, penalties for 2024 and 2025 can be assessed retroactively.
Help Paying for the Work
Bringing a large building into compliance can run into the millions, and several programs exist to offset the cost.
NYC Accelerator is a free city-funded technical assistance program that helps owners navigate LL97 from start to finish, providing access to energy efficiency experts, help with technology and financing choices, and a directory of qualified service providers and design professionals.11NYC Accelerator. NYC Accelerator Its Momentum tool is a concierge-style service for co-ops, condos, and property managers to plan retrofits, project compliance, and estimate potential penalties.12NYC Office of Climate and Sustainability. NYC Accelerator for a New Era
Commercial Property Assessed Clean Energy (C-PACE) financing is available in the city for energy efficiency and clean energy upgrades. C-PACE can cover up to 100 percent of upfront project costs, repaid through an assessment on the property tax bill over terms as long as 20 years.13US EPA. Commercial Property Assessed Clean Energy Eligible property types include multifamily buildings of three or more units, commercial and industrial properties, and buildings owned by tax-exempt organizations. NYC Accelerator oversees C-PACE applications through NYCEEC, which approves qualified PACE lenders.14NYC Accelerator. NYC PACE Financing The assessment stays with the property on sale if the buyer agrees, which can make large retrofits more workable for owners who may not hold through the full payback. Note that past-due PACE payments take priority over the mortgage in foreclosure, so lender consent is typically required before closing.
At the federal level, the Section 179D Energy Efficient Commercial Buildings Deduction offers a tax incentive for qualifying energy improvements. Where prevailing wage and apprenticeship requirements are met, the deduction ranges from $2.90 to $5.81 per square foot depending on energy savings, with the maximum available when energy costs are cut by at least 49.25 percent compared to a reference building. Projects that don’t meet the prevailing wage requirement qualify for a reduced deduction of $0.58 to $1.16 per square foot.15Internal Revenue Service. Energy Efficient Commercial Buildings Deduction The amounts are adjusted annually for inflation; 2026 figures had not yet been published at the time of writing but are expected to be close to the 2025 values.