Before you can estimate a penalty, you need to know whether Local Law 97 even applies to your building. Coverage is broad, but there are nuances around multi-building lots, condos, and certain building types that follow different paths.
The main threshold: 25,000 square feet
The core rule is size. LL97 generally covers buildings over 25,000 gross square feet. If your single building exceeds that threshold, the default assumption should be that it is covered until you confirm a specific exception applies.
Multiple buildings and tax lots
Coverage isn’t only about one building in isolation. LL97 also reaches:
- Two or more buildings on a single tax lot that together exceed 25,000 square feet.
- Certain condominium arrangements governed by the same board whose buildings collectively cross the threshold.
This catches campuses, complexes, and condo associations that might otherwise assume each individual structure is too small to qualify.
Special and alternative compliance paths
Some building types do not follow the standard emissions-limit-and-penalty path. Depending on the category, a building may follow a prescriptive compliance path (implementing a defined set of energy-conservation measures) or other alternative requirements rather than the standard cap. Categories with special treatment historically include certain rent-regulated housing and other specific occupancy types. If your property might fall into one of these, that determination materially changes your obligations — so it is worth confirming rather than assuming.
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Enter any NYC address or BBL and we pull its last LL84 benchmarking filing, apply the Local Law 97 cap for its property type, and show the estimated $268/tCO2e penalty — free, no signup.
How to check your building
- Confirm gross square footage. The 25,000 sf line is the first gate.
- Check the tax lot. Multiple buildings or condo structures on one lot can be aggregated.
- Identify occupancy type(s). This determines both whether a special path applies and what your emissions limit is.
- Verify your LL84 status. Buildings doing LL84 benchmarking are almost always within LL97’s scope.
Go deeper
From estimate to a compliance plan
When a single-building number isn’t enough, we offer flat-fee work products: a Portfolio Carbon Screen ($1,500) across all your buildings, a Retrofit Economics Model ($3,500), and a lender-ready Compliance Strategy Brief ($6,500).
Why occupancy type matters as much as size
Square footage decides whether you are covered; occupancy type decides how hard the cap bites. Each building-use category carries its own emissions-intensity limit, set to reflect how energy-intensive that use legitimately is. A hospital or a data-heavy building has a more generous intensity limit than an office or a warehouse, because the city does not expect them to operate on the same carbon budget. For mixed-use buildings, the limits blend across the floor area devoted to each use. This is why two buildings of identical size on the same block can face very different caps — and why getting your occupancy classification right is not a paperwork detail but a direct driver of your penalty exposure.
Once you have confirmed coverage, the next questions are how the penalty is calculated and how your limit tightens at the 2030 deadline.