Last verified: August 22, 2026. By Will Tygart. For owners, boards, property managers, and advisors navigating New York City building-performance laws — especially Local Law 97. Not legal advice. Confirm dates and factors with current DOB notices and your RDP.
Most ESG content talks frameworks. NYC buildings live or die on dates, portals, penalties, and pathways. This hub is the load-bearing structure for everything on this site about LL97, the broader stack (LL84, LL88, LL33), and how those duties connect to continuity and insurance.
Start here — pick your situation
1. I need the fine math now
LL97 penalty calculator — $268 per ton. Estimates only. Confirm with your RDP.
2. I’m up against 2026 filing dates
June 30, 2026: file or request the extension · DOB NOW, ESPM, and BEAM walkthrough
- May 1, 2026 — typical due date for the CY2025 emissions report
- June 30, 2026 — grace / last day commonly cited to apply for the $60 extension to August 29, 2026
- Non-filing is a different animal from overage — non-filing estimator
3. I manage co-ops, condos, or a board
Co-op and condo LL97 playbook · Board resolution checklist · Article 320 vs 321 decision tree
4. I need the whole year on one page
2026–2030 NYC building compliance calendar · LL84, LL88, LL97, and LL33 as one stack
5. I’m planning past 2029
2030 cap-tightening scenarios by property type · Good-faith strategies when over cap · LL84 as the LL97 data spine
Clusters in this pillar
- LL97 core — coverage, 2024–2029 vs 2030 factors, penalty formula
- The full NYC stack — benchmarking, lighting/submetering, energy grades, efficiency-report cycles as one workflow
- Co-ops, condos, special pathways — Article 320 vs 321, board governance
- Filing, deadlines, extensions — DOB NOW → ESPM → BEAM, RDP bottlenecks
- Mitigation and good faith — RECs, offsets, adjustments, documentation
- Continuity and insurance — LL97 data in the BCP and renewal file
How we write this
- Primary sources: Admin Code, 1 RCNY 103-14, DOB service notices
- Worked math, not vibes. Overage ≠ non-filing.
- No promised legal outcomes. RDP and counsel own the building-specific call.
Related hubs: Tools · Business continuity · NYC Accelerator LL97 · NYC DOB LL97.