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BES Building Performance Intelligence

Building Performance at a Glance.

Current emissions, future exposure, operating cost, and recommended priorities — in one integrated view.

Preliminary estimates based on user-provided data. Final compliance determinations require review of official records and applicable regulations.

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LL97 Carbon Exposure Calculator · Advisory Estimate

Model your building's carbon penalty exposure across every LL97 compliance period.

Enter mixed-occupancy areas, utility consumption, rates, and onsite solar offsets to estimate emissions, the blended LL97 limit, overage, projected penalty, and a recommended BES advisory pathway. Methodology follows NYC DOB §103-14 coefficients and per-occupancy limits across the 2024–2050 trajectory, modeled after the Building Energy Exchange Climate Calculator.

Building Inputs
Compliance period
Occupancy & Floor Area
1
Total gross floor area250,000 sf
Annual Utility Consumption & Rates
Electricity
kWh
/kWh
Natural gas
therms
/therms
District steam
Mlb
/Mlb
Fuel oil #2
gal
/gal
Fuel oil #4
gal
/gal
Carbon Deductions
Deducts 0.0 tCO₂e/yr from gross emissions using the NYC grid coefficient.

Coefficients per NYC DOB §103-14 (2024). Electricity grid factor 0.000288 tCO₂e/kWh · Gas 0.005311 tCO₂e/therm · Steam 0.05365 tCO₂e/Mlb · No.2 fuel oil 0.01021 tCO₂e/gal · No.4 fuel oil 0.01124 tCO₂e/gal. Default utility rates are advisory NYC blended estimates — override with your actual contracted rates for accurate cost modeling.

LL97 Limits by Period · Blended for selected occupancies
tCO₂e / sf · yr

Advisory estimate only. Actual penalty exposure depends on LL97 adjustments, mediated reductions, beneficial electrification credits, GHG offset purchases, and DOB rulemaking. BES will produce a fileable model for your specific portfolio on request.

Looking for LL33/95, LL84, LL85, LL86, LL87, LL88 context?

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Start Your Engagement

The penalty period is here.
Let's engineer the path through it.

Share your property details and BES will return a no-obligation LL97 exposure summary, recommended audit pathway, and incentive eligibility within five business days.

Book a Consultation →Request LL97 Review →Submit Building Information →