Local Law 97
LL97 isn't going away. Here's how to model your exposure today.
Local Law 97 caps emissions for NYC buildings over 25,000 sq ft — with penalties of $268 per metric ton CO₂e over the limit, no cap. Period 1 is the warm-up. Period 2 is the cliff. LLDesk models both for you, by BIN, with the city's penalty math built in.
$268/tCO₂e · No cap on annual penalties · May 1 reporting deadline
The timeline
Three periods. One trajectory.
Period 1 · 2024–2029
The warm-up.
Limits in Period 1 are relatively lenient — most NYC buildings with reasonable energy efficiency are under the cap. But the May 1 annual reporting deadline is real, and underreporting carries its own penalties. This is the period to get your benchmarking clean and your data honest.
Period 2 · 2030–2034
The cliff.
Limits drop dramatically. Buildings that were comfortably under in Period 1 can suddenly face six-figure annual penalties. Multifamily, commercial, and mixed-use properties are all affected — but the math works differently for each. The time to model is now, while retrofits still pencil.
Beyond 2035
The trajectory.
LL97 limits continue to tighten on a path toward an 80% emissions reduction by 2050. Owners with long-hold horizons need to think in 10–20 year capex cycles, not annual reports.
What owners can do today
Four moves before the 2030 cliff.
Pull your real building data.
Start from LL84 benchmarking submissions, not estimates. LLDesk imports your benchmarking data and models actual emissions per BIN.
Model both periods, side by side.
See your projected emissions vs. Period 1 limits and Period 2 limits in the same view. Quantify exposure at the city's $268/tCO₂e penalty rate.
Identify the highest-leverage retrofits.
Heat-pump conversions, building envelope improvements, and electrification of domestic hot water are the usual suspects. LLDesk surfaces which moves close the gap fastest for your specific building.
Get vendor quotes through the marketplace.
Engineering studies, mechanical contractors, energy auditors. Borough-specific, license-verified, and accessible from inside the platform.
Free check
See your LL97 exposure in 60 seconds.
Enter your building. We'll model your Period 1 and Period 2 exposure at the $268/tCO₂e rate. No account required.