20 Thorn St
Multifamily Housing in Boston, MA · 2136.
At a glance
20 Thorn St is a 15,372-square-foot multifamily housing building in Boston, Massachusetts. In its 2024 Boston benchmarking disclosure it reported a site energy-use intensity of 43.8 kBtu/ft² and 37 tCO₂e of greenhouse-gas emissions.
BERDO 2.0 · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 43.8 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 37 tCO₂e |
| GHG intensity | — |
| Electricity | 91,802 kWh |
| Natural gas | 3,596 therms |
| Gross floor area | 15,372 sq ft |
| Source record | boston:107476:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 43.8 kBtu/ft² | 37 tCO₂e | |
| 2023 | — | — | — | |
| 2022 | — | — | — |
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
GBM PORTFOLIO OWNER LLC
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Location
- Address
- 20 Thorn St
- City
- Boston
- State
- Massachusetts
- ZIP
- 2136.
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 20 Thorn St compare with other multifamily housing buildings in Boston?
The latest disclosures cover 2,174 multifamily housing buildings in Boston, out of 6,305 buildings citywide. Its site EUI of 43.8 kBtu/ft² is about 35% below the average of 67.7 kBtu/ft² — it uses less energy per square foot than the typical building in that group.
At 15,372 sq ft, it is about 74% below the average floor area of 58,087 sq ft for those buildings. Across all 24 jurisdictions BuildingCensus covers, the 59,945 multifamily housing buildings average an ENERGY STAR score of 70 and a site EUI of 59.0 kBtu/ft².
How has 20 Thorn St's energy performance changed over time?
BuildingCensus holds 3 Boston disclosures for 20 Thorn St, covering report years 2022–2024. Only one of those years carries energy figures.
What does a site EUI of 43.8 kBtu/ft² mean?
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. 20 Thorn St's 43.8 kBtu/ft² across 15,372 sq ft works out to about 0.7 billion Btu (197 MWh-equivalent) in 2024. The disclosure also reports 91,802 kWh of electricity and 3,596 therms of natural gas for the year.
Which law requires 20 Thorn St to report its energy use?
20 Thorn 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:107476:2024). 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 multifamily housing buildings in Boston
- 11-11A Parker Hill Ave· 15,360 sq ft · score 93 (A)
- 142 Chestnut St· 15,360 sq ft · EUI 30.3 kBtu/ft²
- 50 Buswell St 02215· 15,305 sq ft · score 45 (D)
- 1375 Commonwealth Ave· 15,300 sq ft · score 40 (D)
- 60 Southern Ave· 15,300 sq ft · EUI 118.5 kBtu/ft²
- 19 Queensberry St· 15,288 sq ft · score 74 (B)
- Multifamily Housing buildings in Boston· 2,174 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 20 Thorn St's energy grade?
20 Thorn St did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 43.8 kBtu/ft².
How much energy does 20 Thorn St use?
Its 2024 site energy-use intensity was 43.8 kBtu/ft² across 15,372 sq ft, including 91,802 kWh of electricity and 3,596 therms of natural gas.
What are 20 Thorn St's carbon emissions?
20 Thorn St reported 37 tCO₂e of greenhouse-gas emissions for 2024.
Where is 20 Thorn St?
20 Thorn St is in Boston, Massachusetts 2136.
How big is 20 Thorn St and when was it built?
20 Thorn St has 15,372 sq ft of gross floor area, as reported in its 2024 disclosure. It is classed as multifamily housing.
Is 20 Thorn 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, “20 Thorn St, Boston, Massachusetts — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/boston/20-thorn-st-b3761e8e (data as of July 9, 2026).