Local Law 97: what NYC office and industrial owners need to model now.

Local Law 97 sets annual greenhouse-gas limits for most New York City buildings over 25,000 sq ft, enforced by the NYC Department of Buildings, with additional rules for certain building groups. Limits began in 2024 and tighten in 2030. Whether a specific building clears either period depends on its reported emissions and its covered category, not on a general rule.

Compliance is measured on reported annual emissions from energy used at the property, converted with published coefficients by fuel. Emissions above the applicable annual limit can incur penalties, subject to the building's compliance pathway and available adjustments or mitigation.

Buildings over 25,000 gross sq ft in New York City, and two or more buildings on a single tax lot exceeding 50,000 sq ft combined.

Additional and alternative rules apply to certain groups, including rent-regulated housing and other defined classes. Confirm your covered status, reporting obligation and available deductions with counsel.

The emissions-exceedance penalty can be up to $268 per metric ton above the annual limit, subject to applicable adjustments and mitigation. Model the building's reported emissions and compliance options before estimating exposure.

The capital side is the second cost: envelope, MEP and controls upgrades driven by LL97 compete for the same capital budget as leasing, TI and debt service.

On-site generation and storage can support the compliance case, but neither guarantees compliance. The effect depends on the reporting rules, the deductions the building can claim and who owns the environmental attributes of the generation, so we assess those three before presenting any compliance benefit.

Where a project is third-party funded, the owner may avoid a capital outlay at a moment when capital is already committed to LL97-driven envelope, MEP and controls upgrades. Funding, ownership and benefit allocation are set in the project agreement after underwriting.