At a glance
341-345 Congress St is a 119,643-square-foot office building in Boston, Massachusetts. In its 2024 Boston benchmarking disclosure it reported an ENERGY STAR score of 64 out of 100 (grade C), a site energy-use intensity of 85.2 kBtu/ft² and 576 tCO₂e of greenhouse-gas emissions. That score is higher than 27% of the 356 scored office buildings in Boston.
BERDO 2.0 · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 64 (band C) |
| Site EUI | 85.2 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 576 tCO₂e |
| GHG intensity | — |
| Electricity | 2,599,073 kWh |
| Natural gas | 13,311 therms |
| Gross floor area | 119,643 sq ft |
| Source record | boston:104398:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 64 | -1 | 85.2 kBtu/ft² | 576 tCO₂e |
| 2023 | 65 | +16 | 82.4 kBtu/ft² | 587 tCO₂e |
| 2022 | 49 | 100.7 kBtu/ft² | 899 tCO₂e |
Compliance context
BERDO 2.0
BERDO 2.0 sets emissions standards for buildings of 20,000+ sq ft or 15+ units, starting in 2025 or 2030 depending on building size, with an alternative-compliance payment of $234 per metric ton of CO₂e over the limit.
Ownership
MEPT SEAPORT 343 CONGRESS LLC
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Location
- Address
- 341-345 Congress St
- City
- Boston
- State
- Massachusetts
- ZIP
- 2210.
Within ~1 km
Nearby benchmarked buildings
This source publishes no coordinates, so nearby buildings can't be resolved yet.
See also: most efficient in Boston · biggest emitters
How does 341-345 Congress St compare with other office buildings in Boston?
The latest disclosures cover 467 office buildings in Boston, out of 6,305 buildings citywide. 341-345 Congress St's ENERGY STAR score of 64 compares with an average of 71 across the 356 that report a score; it scores higher than 27% of them and lower than 70%. Its site EUI of 85.2 kBtu/ft² is about 38% above the average of 61.7 kBtu/ft² — it uses more energy per square foot than the typical building in that group.
At 119,643 sq ft, it is about 38% below the average floor area of 191,803 sq ft for those buildings. Across all 24 jurisdictions BuildingCensus covers, the 15,264 office buildings average an ENERGY STAR score of 73 and a site EUI of 59.3 kBtu/ft².
How has 341-345 Congress St's energy performance changed over time?
BuildingCensus holds 3 Boston disclosures for 341-345 Congress St, covering report years 2022–2024. Its ENERGY STAR score went from 49 in 2022 to 64 in 2024 (+15 points); its best year on file was 2023, at 65. Site EUI moved from 100.7 kBtu/ft² (2022) to 85.2 kBtu/ft² (2024), a 15% decrease. Reported emissions went from 899 tCO₂e to 576 tCO₂e over the same span (down 36%).
What does an ENERGY STAR score of 64 mean?
ENERGY STAR scores run from 1 to 100 and are computed by the EPA's Portfolio Manager as a percentile against similar buildings nationwide, adjusted for climate, size and use: a score of 64 means the building performs better than about 64% of its national peers. BuildingCensus bands the score into report-card grades; 64 falls in band C — below median (55–69). It sits 11 points below 75, the threshold for ENERGY STAR certification. In Boston, 52% of scored buildings are at 75 or above.
Site energy-use intensity (EUI) is the energy a building uses on site in a year divided by its floor area, in thousand Btu per square foot — lower is more efficient. 341-345 Congress St's 85.2 kBtu/ft² across 119,643 sq ft works out to about 10.2 billion Btu (2,987 MWh-equivalent) in 2024. The disclosure also reports 2,599,073 kWh of electricity and 13,311 therms of natural gas for the year.
Which law requires 341-345 Congress St to report its energy use?
341-345 Congress St reports under BERDO 2.0, the legal basis of Boston's Building Emissions Reduction and Disclosure Ordinance, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2024 disclosure (source record boston:104398:2024). BERDO 2.0 sets emissions standards for buildings of 20,000+ sq ft or 15+ units, starting in 2025 or 2030 depending on building size, with an alternative-compliance payment of $234 per metric ton of CO₂e over the limit.
More office buildings in Boston
- 20 Winthrop Sq· 118,000 sq ft · EUI 49.3 kBtu/ft²
- 333 Summer St· 117,801 sq ft · score 88 (A)
- 2-14 High St· 116,823 sq ft · score 93 (A)
- 99 Chauncy St· 116,805 sq ft · score 90 (A)
- 209 Columbus Ave· 116,766 sq ft · score 93 (A)
- 24-34 Damrell St· 115,650 sq ft · score 100 (A)
- Office buildings in Boston· 467 benchmarked
- All Boston benchmarked buildings· BERDO 2.0
- Most efficient large buildings in Boston
- Least efficient large buildings in Boston
- Biggest emitters in Boston
Frequently asked questions
What is 341-345 Congress St's energy grade?
341-345 Congress St scores 64 out of 100 on ENERGY STAR — band C, below median (55–69) — in its 2024 Boston disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 341-345 Congress St use?
Its 2024 site energy-use intensity was 85.2 kBtu/ft² across 119,643 sq ft, including 2,599,073 kWh of electricity and 13,311 therms of natural gas.
What are 341-345 Congress St's carbon emissions?
341-345 Congress St reported 576 tCO₂e of greenhouse-gas emissions for 2024.
Where is 341-345 Congress St?
341-345 Congress St is in Boston, Massachusetts 2210.
How big is 341-345 Congress St and when was it built?
341-345 Congress St has 119,643 sq ft of gross floor area, as reported in its 2024 disclosure. It is classed as office.
Is 341-345 Congress St covered by BERDO 2.0?
Yes — it appears in the 2024 Building Emissions Reduction and Disclosure Ordinance disclosure, which lists the buildings reporting under BERDO 2.0.
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About this data
Source: Building Emissions Reduction and Disclosure Ordinance (BERDO 2.0), as published July 9, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “341-345 Congress St, Boston, Massachusetts — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/boston/341-345-congress-st-eca2a6b1 (data as of July 9, 2026).