What each law does
Local Law 84: Benchmarking (energy and water data disclosure)
Local Law 84 is NYC’s benchmarking requirement. Covered buildings must annually report energy and water consumption using ENERGY STAR Portfolio Manager, then share that data with NYC for processing and compliance. The annual benchmarking deadline is May 1 each year.
Operationally, DOB now frames Local Law 84 “submission” as a property-sharing workflow. Your Portfolio Manager data must successfully transfer into NYC’s platform in order to count as timely. DOB specifically recommends sharing your property with the City at least 15 business days before the deadline to avoid timing and transfer issues.
Local Law 97: Emissions limits (and annual emissions reporting)
Local Law 97 is NYC’s greenhouse gas emissions law. It sets carbon emissions limits for covered buildings beginning in 2024, with stricter limits beginning in 2030.
LL97 also includes an annual reporting requirement. DOB’s guidance states the LL97 reporting portal is used for submissions and identifies the BEAM portal environment for reporting.
So the simplest way to remember it:
Covered-building thresholds: similar headline number, different grouping rules
This is where people get burned. Both laws commonly reference 25,000 square feet, so it’s easy to assume the coverage rules are identical. They are not.
Local Law 84 coverage (benchmarking)
DOB’s benchmarking guidance uses:
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A 25,000+ gross square foot threshold for a covered building
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A 100,000+ combined threshold for certain scenarios involving multiple buildings on the same tax lot or condo groupings (depending on Covered Buildings List status and definitions)
Local Law 97 coverage (emissions)
DOB’s LL97 guidance states coverage includes:
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A building that exceeds 25,000 gross square feet
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Two or more buildings on the same tax lot that together exceed 50,000 gross square feet
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And similar combined rules for condos governed by the same board (50,000+ combined)
Why this matters: A multi-building lot can be pulled into LL97 compliance at a lower combined threshold than many owners expect. That distinction is especially relevant in dense mixed-use areas across Manhattan and Brooklyn, and in multi-building properties throughout Queens, the Bronx, and Staten Island.
What you file and where you file it
This is the most common operational failure: owners do the right work, then try to “submit” it in the wrong place.
LL84: What you file, where you file, and what counts as proof
For Local Law 84, what you file is your annual energy (and where required, water) benchmarking data in ENERGY STAR Portfolio Manager.
But what counts as proof is not “I entered it in Portfolio Manager.” DOB states that for timely submission, your Portfolio Manager data must successfully transfer into the City’s platform, and you should retain the confirmation as proof.
DOB also notes the May 1 deadline and the quarterly follow-on dates (Aug 1, Nov 1, Feb 1) that are relevant if you miss May 1.
LL97: What you file, where you file, and certification requirements
For Local Law 97, what you file is an annual greenhouse gas emissions report through the LL97 reporting portal, which DOB indicates is open for submissions at the BEAM portal URL.
DOB’s emissions reporting guidance defines what buildings are covered and places the reporting obligation within the LL97 framework.
So practically:
How workflows connect in real life
Local Law 84 and Local Law 97 are different obligations, but they touch the same operational plumbing: your building’s energy consumption data.
DOB’s processing FAQs make this connection explicit: while benchmarking data is not needed for LL88 compliance, it is required for LL97 compliance.
That’s why many buildings should treat LL84 benchmarking as a data integrity foundation for LL97.
Here’s what this looks like in practice:
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If your Portfolio Manager share fails due to incorrect identifiers or setup, your LL84 submission can fail to transfer on time.
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If your underlying energy data is incomplete or inconsistent, it increases downstream risk for emissions reporting and compliance planning under LL97, even if a different consultant or design professional is handling the LL97 report.
This is why NYC owners often seek LL84 compliance solutions and LL84 benchmarking support even when their “bigger fear” is LL97 penalties. The foundation matters.
2026 takeaways you can act on
1) Treat May 1 as a portfolio-wide compliance deadline
DOB is clear that Local Law 84 benchmarking is due by May 1 each year, with quarterly follow-on dates if missed.
DOB also frames LL97 reporting as an annual process, with the reporting portal used for submissions.
For property managers, the operational takeaway is simple: build a calendar that assumes May 1 is a multi-law deadline, then work backward.
2) Do not assume last year’s portal flow is unchanged
DOB processes and pathways change. If your team is relying on “how we did it last year,” that’s a risk factor by itself. The safer approach is to confirm workflows early and confirm proof of transfer.
3) If you miss LL84, penalties compound quarterly
DOB states failure to submit a compliant benchmarking report by May 1 can result in a $500 penalty, with continued quarterly penalties up to $2,000 per year.
This is why “we’ll deal with it later” is usually the most expensive plan.
Quick comparison: LL84 vs LL97
| Topic |
Local Law 84 (LL84) |
Local Law 97 (LL97) |
| Core purpose |
Benchmark and disclose annual energy (and water) use |
Reduce building GHG emissions and report annually |
| Who is covered |
Covered Buildings List rules, including 25,000+ and certain combined thresholds |
25,000+ building or 50,000+ combined tax lot and condo rules |
| What you submit |
Portfolio Manager benchmarking data + successful transfer |
Annual emissions report via LL97 reporting portal |
| Deadline rhythm |
May 1 annually; follow-on quarterly deadlines if missed |
Annual reporting cadence; portal used for submissions |
If you want a compliance workflow that keeps Local Law 84 benchmarking clean and defensible (and reduces downstream Local Law 97 risk), start with a benchmarking audit.
The goal is not “a report that exists.” It’s a report that:
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Transfers successfully
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Can be defended if challenged
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Avoids quarterly penalties
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Supports long-term planning
If you manage a building in NYC and want help confirming which laws apply and which workflow you should be using, Energo’s NYC compliance services can help you get clarity and stay compliant.
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