Understand which NYC buildings LL97 covers, how emissions screening works and which records an owner should verify before acting.
LL97 generally covers a building exceeding 25,000 gross square feet; two or more buildings on one tax lot exceeding 50,000 gross square feet together; or two or more condominium buildings under the same board of managers exceeding 50,000 gross square feet together. Exceptions and compliance pathways require building-specific verification.
A BBL identifies a tax lot; a BIN identifies an individual building. One lot can contain several buildings. Confirm the building and its pathway in DOB’s current records before applying a cap or using a screening estimate.
Article 320 annual-limits pathways can begin in different years. Certain buildings follow Article 321 one-time compliance requirements. City and NYCHA properties have different requirements. A covered-building label alone does not establish which annual penalty calculation applies.
BuildingFi shows a preliminary screening estimate when its public energy inputs, building identity and calculation pathway support one. Missing or conflicting evidence leaves the estimate unavailable. A modeled result does not establish an assessed amount owed or certify compliance.
Beginning in 2026, DOB requires emissions limits based on ENERGY STAR Portfolio Manager (ESPM) property types. For mixed uses, each disclosed use area contributes to the cap. Original occupancy-group limits are historical comparisons, not the default current method.
For a hypothetical Article 320 building with 100 tCO₂e of verified excess emissions, the basic excess-emissions arithmetic is 100 × $268 = $26,800 for that year. This example does not include deductions, adjustments, mitigation, filing penalties or a DOB assessment.
Article 320 generally requires an annual report certified by a registered design professional. The statutory reporting date is May 1. The energy-data year, modeled emissions year and filing year are different fields; check each one.
DOB’s February 27, 2026 notice states that reports required in 2026 were due May 1, with a June 30 reporting boundary. Owners had until June 30 to apply for an extension to August 29, 2026. These dates have passed; verify the actual filing and any approved extension in DOB’s reporting process. Extensions announced in 2025 do not carry over automatically.
The calculator’s 2030–2034 comparison holds reported consumption constant and applies the displayed future factors and limits. It is a planning scenario; it does not predict energy use or future liability.
DOB provides guidance on deductions, alternatives and mitigation. An improvement’s energy effect and any financing eligibility require separate review. BuildingFi’s lookup does not determine financing approval or prescribe a retrofit.
LL97 generally covers a building exceeding 25,000 gross square feet; two or more buildings on one tax lot exceeding 50,000 gross square feet together; or two or more condominium buildings under the same board of managers exceeding 50,000 gross square feet together. Exceptions and compliance pathways require building-specific verification.
For buildings subject to Article 320 annual limits, DOB lists a $268 rate per metric ton of carbon-dioxide equivalent above the applicable annual emissions limit. Filing penalties and mitigation are separate considerations.
Beginning in 2026, DOB requires emissions limits based on ENERGY STAR Portfolio Manager (ESPM) property types. For mixed uses, each disclosed use area contributes to the cap. Original occupancy-group limits are historical comparisons, not the default current method.
No. The emissions calculation, applicable pathway and required reporting must be verified separately. A public LL84 record does not establish an LL97 filing or compliance certificate.
Public records and source lists can change. Verify the current building record and filing requirements with DOB and your compliance professional before making a compliance or budget decision.