58 Horan Way / 42 Walden St
Multifamily Housing in Boston, MA · 2130.
At a glance
58 Horan Way / 42 Walden St is a 19,116-square-foot multifamily housing building in Boston, Massachusetts. In its 2024 Boston benchmarking disclosure it reported a site energy-use intensity of 67.2 kBtu/ft² and 68 tCO₂e of greenhouse-gas emissions.
BERDO 2.0 · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 67.2 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 68 tCO₂e |
| GHG intensity | — |
| Electricity | 11,028 kWh |
| Natural gas | 12,472 therms |
| Gross floor area | 19,116 sq ft |
| Source record | boston:107943:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 67.2 kBtu/ft² | 68 tCO₂e | |
| 2023 | — | 84.4 kBtu/ft² | 88 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
CITY OF BOSTON
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Location
- Address
- 58 Horan Way / 42 Walden St
- City
- Boston
- State
- Massachusetts
- ZIP
- 2130.
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 58 Horan Way / 42 Walden 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 67.2 kBtu/ft² is roughly in line with the average of 67.7 kBtu/ft² — it uses less energy per square foot than the typical building in that group.
At 19,116 sq ft, it is about 67% 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 58 Horan Way / 42 Walden St's energy performance changed over time?
BuildingCensus holds 2 Boston disclosures for 58 Horan Way / 42 Walden St, covering report years 2023–2024. Site EUI moved from 84.4 kBtu/ft² (2023) to 67.2 kBtu/ft² (2024), a 20% decrease. Reported emissions went from 88 tCO₂e to 68 tCO₂e over the same span (down 22%).
What does a site EUI of 67.2 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. 58 Horan Way / 42 Walden St's 67.2 kBtu/ft² across 19,116 sq ft works out to about 1.3 billion Btu (376 MWh-equivalent) in 2024. The disclosure also reports 11,028 kWh of electricity and 12,472 therms of natural gas for the year.
Which law requires 58 Horan Way / 42 Walden St to report its energy use?
58 Horan Way / 42 Walden 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:107943:2024). 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
- 15 Queensberry St· 19,110 sq ft · score 90 (A)
- 49-57 Horan Way· 19,095 sq ft · EUI 88.0 kBtu/ft²
- 120 Warren St· 19,050 sq ft · score 94 (A)
- 55 Park Dr· 19,050 sq ft
- 175 W Ninth St· 19,000 sq ft · score 29 (D)
- 195-201 Quincy St· 18,980 sq ft · EUI 64.9 kBtu/ft²
- 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 58 Horan Way / 42 Walden St's energy grade?
58 Horan Way / 42 Walden St did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 67.2 kBtu/ft².
How much energy does 58 Horan Way / 42 Walden St use?
Its 2024 site energy-use intensity was 67.2 kBtu/ft² across 19,116 sq ft, including 11,028 kWh of electricity and 12,472 therms of natural gas.
What are 58 Horan Way / 42 Walden St's carbon emissions?
58 Horan Way / 42 Walden St reported 68 tCO₂e of greenhouse-gas emissions for 2024.
Where is 58 Horan Way / 42 Walden St?
58 Horan Way / 42 Walden St is in Boston, Massachusetts 2130.
How big is 58 Horan Way / 42 Walden St and when was it built?
58 Horan Way / 42 Walden St has 19,116 sq ft of gross floor area, as reported in its 2024 disclosure. It is classed as multifamily housing.
Is 58 Horan Way / 42 Walden 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, “58 Horan Way / 42 Walden St, Boston, Massachusetts — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/boston/58-horan-way-42-walden-st-ac00f260 (data as of July 9, 2026).