A 150,000-square-foot mixed-use building in New York is comfortably under its carbon cap. Nothing to fix. Nothing to buy. Nothing to explain to anybody.

Its ownership group missed the filing deadline by four months, because nobody could establish which entity in the stack was actually the one required to submit.

At fifty cents per square foot per month, that is $75,000 of penalty exposure on a building that owed nothing on carbon.

This is the scenario I see most. Not owners who cannot hit their targets. Owners who lose money on a filing logistics problem.

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The first reporting cycle is closed and being enforced, so we now have real distribution rather than projection. The Department of Buildings reported in April 2026 that roughly 93% of covered properties filed, ranging from about 83% on Staten Island to about 95% in Manhattan.

The interesting number is the other end. Roughly 1,400 properties did not file at all. Those owners received Notices of Deficiency with a 60-day window to cure before the matter moves to the Office of Administrative Trials and Hearings.

So the overwhelming majority of compliance failure in this law’s first years is not buildings missing a carbon target. It is buildings missing a form.

The two penalties are unrelated to each other

Most owners hold one penalty in their head. There are two, and the one they are not thinking about is the one currently generating enforcement.

Exceeding your limit costs the tonnage over your cap multiplied by $268, annually. Worth knowing: the statute says not more than that amount. It is a statutory maximum assessed through an enforcement proceeding rather than an automatic invoice, which is a meaningful distinction if you are negotiating instead of budgeting.

Failing to file costs your building’s gross floor area multiplied by $0.50 for each month the violation goes uncorrected, running up to twelve months past the deadline. That twelve-month runway is the effective ceiling: $6.00 per square foot, maximum.

The feature that catches people is that the second penalty has nothing whatsoever to do with the first. A building well under its limit and a building wildly over it accrue the identical paperwork penalty at the identical rate. Carbon performance is not an input.

A third exposure changes the character of the risk enough to mention: a materially false statement in a report carries a penalty of up to $500,000 and possible misdemeanor exposure. Which is why just estimate it is not a strategy.

Buildings complying through Article 321, the prescriptive-measures pathway for rent-regulated and income-restricted housing, houses of worship, and similar properties, sit under a different structure entirely: $10,000 for late filing, $10,000 for non-compliance. Not the per-square-foot and per-ton formulas above.

May 1. June 30. Late August.

Most owners have one date in their head, and it is the least generous of three real ones.

May 1 is when the report for the prior calendar year is due.

June 30 ends a grace period during which no late penalty accrues. This is not an extension and nobody sends you a reminder that it is running out.

Late August closes the application window for a genuine extension, which pushes the filing all the way to December 31 and carries your Local Law 84 benchmarking and Local Law 88 lighting and submetering deadlines along with it. There is a modest fee.

That third date is the one that does damage, and the reason is structural rather than technical. An extension is something you apply for, in advance, on a schedule. It is not something you discover you needed in September. Owners who miss the filing deadline have, almost without exception, also missed the deadline to ask for more time. The failure compounds silently, and the first notice of it arrives as a Notice of Deficiency.

Get the baseline right before you model anything

Every covered building receives an annual emissions limit derived from its square footage and its occupancy classification. Offices, multifamily residential, and hospitals carry different per-square-foot carbon budgets because they use energy differently. The city computes actual emissions from consumption, converted to metric tons of CO2e using standard coefficients.

The comparison is simple. The inputs are where it goes wrong.

Meter data is frequently incomplete or split across accounts that nobody has reconciled. Occupancy classifications get misassigned, particularly in mixed-use buildings. And the coefficient for grid electricity shifts as the grid decarbonizes, meaning a building’s reported number can move year over year while its actual energy use sits perfectly still.

Almost every bad surprise at filing time started life as a bad baseline. Confirming classification and consolidating meter accounts is unglamorous and it is most of the real analytical work.

January 1, 2027

The Beneficial Electrification credit is the clearest lever available to most owners, and it has a hard dated edge that is not widely understood.

Electricity consumed by qualifying new electric heating, cooling, or domestic hot water equipment is multiplied by a negative emissions coefficient, producing a deduction against reported emissions. It rewards taking fossil equipment out of a building ahead of the grid’s own decarbonization.

The rate is -0.0013 tCO2e per kWh for equipment operational before January 1, 2027. For equipment operational from that date through the end of 2029, it is -0.00065. Exactly half.

That is the entire planning story. A heat pump project that lands in December 2026 is worth twice as much per kWh as the identical project landing five weeks later. For any owner with electrification work already in motion, pulling the in-service date forward is worth a calculable and large amount of money.

It gets worse in a second direction at the same time. Equipment must be installed before 2030 to qualify at all, and the number of years the credit may be claimed declines with install year: six claimable years for 2024 or earlier, five for 2025, four for 2026, down to a single year for a 2029 install. Later means a smaller rate applied for fewer years.

Two misreads I encounter constantly: that the credit is a permanent discount, and that it applies automatically once electric equipment exists in the building. Neither is true. It is metered or deemed against specific equipment and the load that equipment serves. It is a calculation, not a checkbox, and owners who treat it as one either underclaim relief they are owed or badly overestimate the headroom it buys them.

RECs are narrower than you think

Renewable Energy Certificates let a building deduct emissions associated with renewable electricity it purchases. It is the lever owners reach for first, because it requires no work on the building.

Four rules make it much narrower than the market implies.

The generating resource must be considered by the New York Independent System Operator to be a capacity resource located in, or directly deliverable into, Zone J -- New York City. Upstate wind does not qualify. Out-of-state generation does not qualify. This one rule disqualifies most of what you will be offered.

The certificates must be from the same year as the reporting year. No banking, no forward purchase, no backward vintage.

They must be solely owned and retired by, or on behalf of, the building owner, tracked through NYGATS.

And they may only offset emissions attributable to utility-supplied electricity. They do nothing at all for on-site fossil combustion, which for a steam-heated or gas-heated building is most of the exposure.

There is also an interaction rule with real teeth: an owner who submits a decarbonization plan under the good-faith-efforts pathway may not use RECs during the first compliance period. You do not get to run both strategies.

Then there is supply. Qualifying Zone J capacity is essentially the state’s Tier 4 procurements, Champlain Hudson Power Express and Clean Path New York, which are only now coming online. For most of the first compliance period there was very little to actually buy. If you have been treating RECs as your backstop, confirm the backstop exists before you lean on it.

Good faith efforts, honestly

Article 320 offers a penalty mitigation pathway for owners who cannot hit their limit but can demonstrate they have actively planned for and taken concrete steps toward reducing emissions.

The threshold requirement is filings. The LL97 emissions report, the LL84 benchmarking report, and the LL88 lighting and submetering report all have to be in. On top of that the owner elects a qualifying demonstration: prior compliance, work already underway, a filed utility service upgrade request, critical facility status, or a decarbonization plan. There is a substantial fee.

Two things you should hear plainly. DOB publishes no quantified reduction. No percentage, no formula. The outcome is described as a mitigated penalty or a mediated resolution, and it is negotiated. Anyone quoting you a specific discount is guessing.

And the mechanism requires every one of your filings to be current, which returns you to the top of this paper. The paperwork is the gate, over and over, at every point where relief might otherwise be available.

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None of this requires a building to be perfect. It requires an owner to know, well before the deadline, exactly where they stand.

The 1,400 owners currently in enforcement did not fail an engineering test. Most of them, in all likelihood, have buildings that would have passed. What they did not have was a person whose job was the filing.

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Trevor MacDermid is principal consultant at Ten Mississippi, performing Local Law 97 compliance analysis for solar developers and building owners across New York City. NABCEP PV Technical Sales Professional.

Current as of August 2026. Penalty figures are statutory maximums under NYC Administrative Code §§ 28-320.6 through 28-320.6.3. This is not legal, engineering, or tax advice; verify current requirements with the Department of Buildings before relying on any of it.