Lee Hoffman
Most building owners hear “Local Law 97” and picture a six-figure electrification project or a gut renovation of the mechanical room. That’s the wrong mental model, and it’s the one that keeps owners stuck. For the vast majority of covered multifamily buildings, Local Law 97 is, in effect, a heating system problem, not a capital projects problem. Whether your building runs a gas or oil boiler or pulls heat from the city steam network, the fastest, cheapest lever to pull isn’t a rebuild. It’s fixing how that heating system runs day to day.
The filing is real, and the deadlines matter. But whether you pass or fail is decided by how your heating system performs, not on the form. Buildings still running legacy timer-based controls overheat, burn excess fuel or steam, and rack up the emissions that put them over the limit. Fix that first, before spending on anything bigger, and the compliance picture changes. Skip it, and no amount of careful reporting helps.
This checklist explains what Local Law 97 requires, what you need to report, and where the Local Law 97 2030 limits raise the stakes. It also covers how Runwise, already running in more than 10,000 buildings and the leading platform for reducing Local Law 97 fines, helps you close the emissions gap, starting with the lowest-cost, highest-ROI step first.
Local Law 97 is a NYC building emissions law that sets annual greenhouse gas emissions limits for many large buildings, including most buildings over 25,000 sq ft.
The law went into effect in January 2024 with the objective of reducing greenhouse gas emissions from covered buildings by 40% by 2030 and helping the city reach net-zero emissions by 2050. The 2024 to 2029 compliance period and the Local Law 97 2030 period are operationally very different: limits tighten substantially starting in 2030, and many buildings that are compliant today will not meet those stricter Local Law 97 2030 limits without additional measures beyond what they have in place now. Owners who start planning during the 2028 to 2029 window, while requirements are still relatively lenient, have more runway to phase in low-cost measures before the deadline moves.
It’s not just another energy benchmarking rule, either. Local Law 97 creates emissions limits, annual reporting obligations, and potential penalties for non-compliance.
Covered buildings need to understand their emissions profile, file the required reports, and take steps to reduce the energy waste that can increase compliance risk over time.
The basic coverage threshold applies to anyone overseeing a building over 25,000 gross sq ft in New York City. That means many larger apartment buildings, co-ops, and condos fall under Local Law 97.
Coverage is based on the square footage of a building as it appears in New York City Department of Finance (DOF) records. LL97 also covers two or more buildings on the same tax lot that together exceed 50,000 gross sq ft, as well as two or more condominium buildings governed by the same board of managers that together exceed 50,000 gross sq ft.
You should also understand the role of borough-block-and-lot (BBL) and Building Identification Number (BIN) records. A tax lot is identified by a BBL, and there may be multiple buildings on one BBL. Each building has its own BIN. LL97 compliance may be required for each BIN on a BBL where the buildings together or separately meet the square-foot threshold.
The best way to confirm coverage is to check DOF records or work with a qualified expert who can confirm whether the building is covered, identify the correct reporting obligations, and help you avoid missed deadlines or incorrect filings.
Not all covered buildings follow the same compliance path under Local Law 97. Which path applies depends on your building’s rent regulation status.
Free market buildings (below 35% rent-regulated) must demonstrate each year that actual emissions fall below their assigned carbon limit. 60% to 80% of a multifamily building’s benchmarked energy consumption typically comes from the heating system: the boiler room for buildings with an on-site boiler, or the steam plant and distribution system for buildings on city steam. Fuel or steam use accounts for the overwhelming majority of that consumption, which makes heating system performance the single highest-leverage factor for these buildings.
Rent-stabilized buildings (35% or more rent-regulated) are eligible for the Prescriptive Plan: completing 13 specific efficiency measures instead of hitting a numeric carbon target each year. For a large proportion of NYC multifamily buildings, this is the applicable path.
For buildings on the prescriptive plan path, Runwise directly satisfies three of the 13 required measures in a single installation that takes under one day:
Runwise’s real-time leak detection also supports compliance with the heating system leak repair requirement, making it relevant to a fourth prescriptive measure as well. (If your building runs on city steam rather than an on-site boiler, talk to your engineer about which of the 13 measures apply to your setup.)
What does actually staying ahead of LL97 look like day to day? It’s a clear checklist you follow before each reporting deadline, not a scramble in April. Here are the steps, in the order that actually matters.
To check whether LL97 applies to your building, start with the basic coverage threshold. Most buildings over 25,000 gross sq ft in New York City are covered, including many larger multifamily properties, co-ops, and condos.
You should also look beyond a single building’s square footage. Some groups of buildings may be covered if they sit on the same tax lot or operate under the same condo board and exceed the combined square-foot threshold. DOB records, a compliance consultant, or a registered design professional can help confirm whether the property needs to file.
Collecting accurate annual energy use data is the key to calculating the emissions that fall under Local Law 97 requirements. For example, a 2026 filing should use data from January 1, 2025 through December 31, 2025.
This should include fuel and steam used for heating, hot water, common areas, and other relevant building systems. The more complete the data is, the easier it becomes to calculate emissions accurately and spot where energy waste may be driving up your compliance risk.
The energy use data needs to be converted into greenhouse gas emissions, measured in metric tons of carbon dioxide equivalent, or tCO2e. This calculation shows how much carbon pollution the building produced during the reporting year based on its fuel, electricity, steam, and other covered energy use. If you’re running Runwise, we make this easier: you can pull historical energy and fuel data directly from the platform to support these calculations.
Once the building’s annual emissions are calculated, compare them against the building’s applicable Local Law 97 limit. If the building is over its limit, you need to understand the size of the gap and what operational changes might close it before the next reporting year.
A registered design professional, such as an engineer or architect, is generally required to certify reports. This is the safest approach because it helps ensure the building’s emissions calculations, documentation, and filing are reviewed by someone qualified to confirm compliance details.
Once the report is prepared and certified by a qualified professional, the next step is to submit it through BEAM, the city’s Building Energy Analysis Manager portal. Local Law 97 reports are generally due each year by May 1 and cover the previous calendar year’s emissions.
For 2026, buildings have a 60-day grace period to file by June 30, 2026. If more time is needed, you can also apply for a filing extension through BEAM by June 30, 2026. Even with extra time on the table, waiting too long raises the risk of rushed calculations, incomplete documentation, or missed steps.
The DOB states that owners may face civil penalties if a covered building exceeds its annual emissions limit. The penalty is calculated by subtracting the building’s emissions limit from its actual reported emissions, then multiplying the difference by $268 per metric ton of CO2e (per NYC DOB guidance).
DOB also states that failing to submit the required annual report can trigger penalties. That makes compliance a two-part risk: the building needs to file correctly, and it needs to stay within its applicable emissions limit.
For most buildings, 60% to 80% of the total energy consumption that determines your LL97 compliance position comes directly from the heating system: the boiler room if you’re burning gas or oil on site, the steam infrastructure if you’re on the city network. Fuel or steam use accounts for the overwhelming majority of that consumption. Legacy timer-based controls, which run heating based on outdoor temperature alone, routinely cause overheating and unnecessary waste across this largest category of building energy use. In our experience, Local Law 97 is, in effect, a heating system problem for most covered multifamily buildings, not a boiler problem alone. Buildings on city steam carry just as much compliance risk from waste they often can’t see.
Ripping out and rebuilding a heating system to fix that is a bit like replacing a car’s engine to fix a check-engine light: technically effective, wildly disproportionate. Full electrification or a complete system rebuild is likely to be very capital intensive, and for most multifamily owners, it’s a non-starter, especially with the Local Law 97 2030 deadline still a few years out. The lower-cost, higher-ROI move is to fix how the existing system runs first with smarter heating controls, see where that gets you, and only then decide whether a bigger capital project is even necessary.
Modern heating controls use connected hardware, wireless sensors, smart boiler and steam system controls, and software dashboards to improve how heating systems run. Instead of relying on manual checks or legacy hardware, they monitor performance in real time, reduce overheating, and cut the waste driving up emissions. No capital project required.
Runwise is the leading platform for reducing Local Law 97 fines, already running in more than 10,000 buildings and covering three of the 13 prescriptive plan measures in a single installation that takes under a day. Buildings running it cut energy costs by 23% on average, directly reducing the wasted fuel and steam driving up LL97 compliance risk.
Results back it up: a Co-Op Board President reported 31.6% fuel savings, a Tri-Star Equities VP saved $20,000 (36% average), and a Co-Op Board Secretary cut fuel costs by 44%.
Runwise pays for itself in under six months on heating costs, and utility rebates can shrink that to one to two months. It’s the lowest-cost, highest-ROI move most buildings can make before tackling anything bigger.
Worth five minutes to see where you actually stand? Most buildings qualify for a rebate that covers some or all of the install, so the math already tends to work in your favor. See what that looks like for your building. It’s a quick check, not a commitment.
The 2024 to 2029 compliance period isn’t the hard part. The Local Law 97 2030 limits are, because they tighten substantially and catch buildings that have been comfortably compliant under the current thresholds. If your building is passing today, that’s a starting point, not a finish line.
The smart move is to start now, while you’re still ahead: run the lowest-cost, highest-ROI measures first, starting with the heating system, see how much room that buys you against the 2030 numbers, and only then evaluate whether you need bigger capital projects. Buildings that wait until 2028 or 2029 to start planning are working with a much shorter runway and a much smaller set of low-cost options.
The main LL97 requirements include confirming whether a building is covered, gathering full-year energy data, calculating annual greenhouse emissions and submitting the data in the form of a report that shows that the building is within the emissions limits set by LL97.
Building owners comply with Local Law 97 by confirming coverage, working with a qualified professional, filing the annual report through BEAM, and taking steps to reduce emissions.
Covered buildings may face civil penalties if they exceed their annual emissions limit or fail to submit the required report.
According to NYC DOB guidance, the civil penalty for exceeding a building’s annual emissions limit is calculated by multiplying the number of metric tons of CO2e emitted above the limit by $268. A building that exceeds its limit by 100 tCO2e, for example, would face a penalty of $26,800 for that reporting year. Separate penalties apply for failing to submit the required annual report, regardless of whether the building was within its emissions limit.
Starting in 2030, Local Law 97’s emissions limits tighten significantly compared to the 2024 to 2029 period, and many buildings currently in compliance will need additional measures to stay under the new caps. Building owners who start with low-cost, high-ROI steps now, like smart heating controls, are in a stronger position heading into the Local Law 97 2030 deadline.
