Regulatory Framework
Understanding
Local Law 97.
A detailed breakdown of NYC coverage, limits, and the $268/ton penalty framework.
Calculate Your FineCoverage & Limits
NYC Local Law 97 requires most buildings over 25,000 square feet to meet new energy efficiency and greenhouse gas emissions limits starting in 2024, with stricter limits taking effect in 2030. The goal is to reduce the emissions produced by the city's largest buildings by 40% by 2030 and 80% by 2050.
Buildings that exceed their annual emissions limits will face a financial penalty of $268 per metric ton of CO2 equivalent over the limit. For large portfolios, these penalties can range from hundreds of thousands to millions of dollars annually.
The LL97
resource library
LL97 Deadlines
The annual May 1 filing cycle, the late-filing accrual, extensions, and how DOB has handled the first cycles.
How LL97 Penalties Are Calculated
The $268/ton mechanics with the math shown — limits, coefficients, and a worked example across 2024–2029 and 2030–2034.
Article 320 vs Article 321
Who has no annual cap, the prescriptive and performance routes, and the one-time §28-321.3 report.
Good Faith Efforts
What qualifies under 1 RCNY §103-14(i)(2), what mitigation can and cannot buy, and the filing mechanics.
Who Certifies an LL97 Filing
The registered design professional requirement — what a PE/RA reviews before signing, and why formula lineage matters.
See the deliverable first
Get a complete
sample package.
The exact package the platform produces for a demo building — judge the work before you book a review.
Source-cited PDF report
Every factor and coefficient cited to the adopted 1 RCNY §103-14 rule text; estimated penalty exposure with the calculation shown.
Formula-linked Excel workbook
Live formulas — click any figure and trace it back to the source utility data. Nothing pasted, nothing to take on trust.
Engagement Protocol
Request a
Local Law 97
Assessment.
Our specialists provide rigorous, source-cited analysis of your building's Local Law 97 exposure.
Direct Inquiry
umesh@ecosum.io