Local Law 84 of 2009 — Annual Energy & Water Benchmarking

What Local Law 84 actually requires

LL84 was the first piece of the 2009 Greener Greater Buildings Plan — the foundation that the rest of NYC's building energy laws were built on. The premise is simple: you can't manage what you don't measure. LL84 makes the city measure.

Every covered building submits its prior-year energy and water consumption to the EPA's ENERGY STAR Portfolio Manager (ESPM) by May 1 each year. From ESPM, the building's profile is shared with the city, where it flows through DOB's BEAM platform for processing and validation. The submission has to clear BEAM — not just exist in ESPM — to count as compliant.

Required data includes whole-building consumption from every fuel source: electricity, natural gas, district steam, fuel oil, and any other energy sources serving the building. Water data is required for buildings flagged in the Covered Buildings List — typically obtained from the NYC Department of Environmental Protection (DEP) and submitted alongside the energy figures.

Two specifics that catch owners off-guard:

• Sharing in ESPM is not the same as filing. Sharing the property profile with NYC starts a processing window. DOB recommends sharing at least 15 business days before May 1 to allow time for validation and any correction.
• Starting 2025, the submission must be certified by a Registered Design Professional (a Professional Engineer or Registered Architect). Buildings that previously had a property manager or owner self-certify need to factor RDP review into their timeline.

Who's covered

LL84 was originally enacted with a 50,000-square-foot threshold. Local Law 133 of 2016 lowered that threshold to 25,000 square feet — roughly doubling the number of covered buildings citywide. Most LL84 references today reflect the post-2016 standard:

• Single buildings larger than 25,000 gross square feet
• Two or more buildings on the same tax lot whose combined area exceeds 100,000 gross square feet
• Two or more condominium buildings governed by the same board with combined area over 100,000 sqft

Coverage is determined by Department of Finance records, published annually in the DOB Sustainability Law Covered Buildings List (CBL). The list is republished every March and reflects the calendar year's filing obligations. A building either appears on the list or it doesn't — owner-side measurement doesn't override the CBL.

Exemptions:

• Properties classified as Tax Class 1 (most one-, two-, and three-family homes)
• Garden-style apartment complexes (with RDP certification of the structure type)
• Buildings owned by the city participating in the Tenant Interim Lease apartment purchase program
• New buildings that haven't yet obtained their first Temporary Certificate of Occupancy (with a temporary exemption request to DOB)

Tax-lot aggregation traps. A 20,000-square-foot building that sits on a tax lot with a 90,000-square-foot building is covered — the combined 110,000 sqft crosses the 100,000-sqft tax-lot threshold. Owners of small buildings on large lots routinely misread their coverage status. Verify against the CBL.

The energy grade label (LL33 of 2018, amended by LL95 of 2019)

LL33 of 2018, refined by LL95 of 2019, takes the data LL84 produces and turns it into a public-facing letter grade. Every LL84-covered building over 25,000 square feet must display an Energy Efficiency Rating Label near each public entrance, refreshed annually.

The grade is calculated from the building's ENERGY STAR score — itself derived from the LL84 benchmarking data — and assigned a letter:

• A: ENERGY STAR score of 85 or higher
• B: 70–84
• C: 55–69
• D: below 55
• F: failed to file LL84
• N: building exempt or not Portfolio Manager-eligible

The label becomes available in the DOB NOW Public Portal each October 1. Owners must print and post it near every public building entrance by October 31. The fine for failing to display is $1,250 per year.

The grade label is a separate compliance obligation from the LL84 filing itself. A building can file LL84 perfectly on time and still owe the $1,250 fine for missing the label posting. Conversely, a building that didn't file LL84 gets an automatic F grade — a publicly-displayed F grade — until next year's filing cycle clears it.

Deadlines and the quarterly penalty schedule

The annual deadline is May 1, covering the prior calendar year. The 2024 data was extended to June 30, 2025 as a one-time grace, but the structural deadline is May 1.

If the May 1 deadline passes without a compliant filing, the penalty schedule activates. Penalties accrue on a quarterly basis:

• May 1: $500 (Q1 missed)
• August 1: $500 (Q2 missed)
• November 1: $500 (Q3 missed)
• February 1 (next year): $500 (Q4 missed)

Maximum annual exposure is $2,000 per filing year, capped at four missed quarters. The penalties don't go away when the building eventually files — fines must be paid regardless of when benchmarking data is eventually submitted. As of December 15, 2025, all benchmarking violation civil penalty payments must be submitted through DOB NOW: Safety.

There's a 30-day window to challenge a violation by submitting a Benchmarking Violation Challenge Form to DOB. Disputes about the building's coverage (square footage, building count, property classification) go to the Department of Finance's benchmarking team rather than DOB.

Penalties

LL84's penalty structure is comparatively gentle next to LL87 or LL97 — but the obligations stack with the grade label fine, and they recur annually until cured.

A building that misses LL84 entirely and fails to display the grade label is looking at up to $3,250 per year in stacked fines. The penalties recur annually until both obligations are cured.

Outstanding penalties may need to be resolved before a late LL84 filing can be fully accepted and closed — which means the longer a building delays, the more accumulates before it can come back into compliance.

Common pitfalls

Sharing in ESPM but not completing the BEAM handoff.

Adding a property to ENERGY STAR Portfolio Manager and entering the data is only the first step. The property has to be shared with NYC, then accepted and processed through BEAM. Owners who entered data in ESPM and assumed they were done are surprised to receive violation notices. DOB recommends sharing at least 15 business days before May 1 to give the processing pipeline room to flag issues.

Tax-lot aggregation underestimates.

Smaller buildings on shared tax lots are covered as long as the combined area exceeds 100,000 sqft. Owners checking their building's individual square footage against the 25,000-sqft trigger miss this. The CBL is the authoritative source — if a building appears, it's covered, regardless of individual size.

Tenant data access on commercial properties.

LL84 requires whole-building consumption, but many commercial buildings have tenants on direct utility accounts. Owners who don't have legal access still need to capture that data for the submission. Most utility companies provide aggregated whole-building totals on request once a privacy-threshold number of tenants is reached. Building this access into commercial leases up front is the cleanest fix going forward.

Grade label posted but expired.

The label refreshes annually each October. A building that posted a 2023 label and forgot about it is technically non-compliant from October 31, 2024 onward — accruing the $1,250 annual fine. Calendar the October 1 release date and the October 31 posting deadline, then refresh.

Assuming RDP certification is optional.

For 2025 filings onward, the submission must be certified by a Registered Design Professional. Owners who managed self-certification through 2024 need to either establish a relationship with an RDP for ongoing annual filings or coordinate with their broader compliance professional.

How LuxNet helps with LL84

LL84 is an annual data submission obligation — but the quality of that submission depends on what's actually happening in the building, and the data trail it creates becomes the foundation that LL97, LL87, and LL88 work all reference later. LuxNet supports benchmarking coordination as part of broader compliance engagements: connecting the field-survey data, energy-data inputs, and operating assumptions that an RDP needs to certify the filing accurately.

For owners with an existing benchmarking consultant or RDP, we coordinate the lighting, controls, and field-condition inputs they need. For owners without one — typically multi-building portfolios where the LL84 obligation has been quietly slipping every year — we help route the filing through the right professional while keeping the building's full LL84 / LL88 / LL97 picture connected.

LL84 is most valuable bundled. As a recurring annual touchpoint, it anchors a longer-term compliance relationship across a portfolio: the same field engagement that produces an LL88 attestation or feeds an LL87 audit also strengthens next year's benchmarking record. One coordinated relationship across the cluster, recurring annual obligations served from the same data backbone, fewer one-off engagements that don't compound.