Guide

Local Law 97 Compliance in NYC: The 2026 Owner's Guide

Local Law 97 is a New York City rule that sets carbon limits on large buildings, and 2026 is the first year owners are living with it in full force. Passed as part of the Climate Mobilization Act, the law caps emissions from most large properties and fines those that run over. The first compliance period is already underway, the first reports have come due, and penalties now attach to real emissions. This guide explains who is covered, how the penalty math works, the reporting deadline, and what owners should check.

What Local Law 97 is, and why the city passed it

Local Law 97, codified at NYC Admin Code § 28-320, is the centerpiece of the Climate Mobilization Act, a package the City Council adopted as Local Law 97 of 2019. Its purpose is to cut greenhouse-gas emissions from large buildings, which are among the city's biggest sources of carbon.

The mechanism is a cap-and-penalty system. Each covered building is assigned an annual emissions limit based on its size and use, and an owner who exceeds that limit pays a fine tied to how far over the building runs. The caps are designed to tighten over time, so a building that complies today may not comply later without changes.

This is general information, not legal or engineering advice. The rules carry technical definitions and exceptions, so confirm your building's status with the Department of Buildings or a qualified professional.

Which buildings are covered

The core threshold is size. Local Law 97 generally applies to buildings over 25,000 gross square feet. It also reaches two or more buildings on the same tax lot that together exceed 50,000 square feet, capturing campus-style arrangements that a single-building test would miss.

Coverage is not uniform. Certain rent-regulated buildings and several other property types follow separate compliance pathways with different requirements, so being over the size threshold does not automatically mean the standard caps apply in the standard way.

Because the lines turn on gross floor area, tax-lot configuration, and building use, an owner who is unsure should confirm coverage rather than assume it. You can look up a building's size and use characteristics and check whether a specific address falls under Local Law 97 before drawing conclusions.

The caps and how the penalty math works

Local Law 97 phases in through compliance periods. The first period runs 2024 through 2029 and, for many buildings, requires roughly a 40 percent cut from a 2005 baseline. Stricter limits take effect January 1, 2030, opening the tougher 2030 through 2034 period.

The penalty for exceeding a cap is $268 for every metric ton of carbon-dioxide-equivalent (CO2e) over the limit, assessed each year. The math scales linearly: a building about 10 tons over its cap would owe roughly $2,680 a year, while one about 500 tCO2e over would owe roughly $134,000 a year.

Because the fine is annual and the caps drop in 2030, a building that is comfortably under today can face exposure later. A Local Law 97 penalty calculator can translate a projected overage into an estimated annual dollar figure.

Reporting: the annual May 1 deadline

Compliance is proven through a report, not just by staying under the cap. Covered owners must file an annual emissions report through DOB NOW, the Department of Buildings' online portal, due May 1 each year for the prior calendar year.

The timing matters in 2026 because the program is no longer theoretical. Penalties apply to 2024 emissions, and the first reports were due May 1, 2025. The first full cycle of filings and any resulting penalties are already behind us, and the next report follows the same May 1 schedule.

Missing or misfiling the report is its own risk, separate from the emissions cap itself. Owners who have not yet filed for a covered building should treat the deadline as a live obligation and confirm their standing with the Department of Buildings.

What owners, managers, and buyers should do now

Start by confirming coverage and pulling the building's baseline: gross square footage, use type, and energy consumption. Those inputs determine the applicable cap and whether the standard pathway or a separate one applies.

One lever built into the law is renewable energy credits. Owners may offset up to 50 percent of a building's electricity emissions by purchasing RECs, which can narrow or close a gap without physical retrofits, though it does not address emissions from on-site fuel such as gas heat.

Buyers should treat Local Law 97 exposure as part of diligence, since the obligation runs with the building. Reviewing projected caps, recent DOB NOW filings, and any accrued penalties before closing can reveal a recurring annual cost that outlasts the current owner. As always, this is general information, not legal advice; verify specifics with the relevant city agency or a professional.