In New York City LL84 Benchmarking Deadline Is May 1. Your Data Quality Determines Your Score.

New York City's Local Law 84 requires annual benchmarking of energy and water consumption for buildings over 25,000 square feet, using the EPA's ENERGY STAR Portfolio Manager tool. The deadline is May 1 each year.

The $500 per quarter penalty for non-compliance gets most of the attention. But the more significant issue is what your benchmarking score reflects — and how it affects your building's value and compliance exposure under LL97.

Your LL84 score is calculated from the utility data you report. If that data includes metering errors, misallocated consumption, or billing inaccuracies, your ENERGY STAR score may be lower than your building's actual performance warrants. In an environment where building scores affect tenant attraction, financing, and LL97 penalty calculations, that is a material problem.

We recommend auditing your utility billing data before benchmarking, correcting any errors in the historical record, and then submitting your LL84 report based on clean, verified data. Your score reflects your actual performance — not the accumulated errors of your utility billing history. The stakes for getting this right have risen. New York City's first LL97 compliance year has now closed — the 2024 emissions filing deadline was March 31, 2026, and the Department of Buildings' final penalty assessment date, including its good-faith-effort adjustment window, was May 1, 2026. Buildings now receiving Notices of Violation are being billed $268 per metric ton of CO2e above their cap, every year, until the underlying emissions — and the utility data behind them — are corrected.