3 Mellen Street
Multifamily Housing in Cambridge, MA
At a glance
3 Mellen Street is a 2,123-square-foot multifamily housing building in Cambridge, Massachusetts, built in 2007. In its 2024 Cambridge benchmarking disclosure it reported a site energy-use intensity of 37.3 kBtu/ft² and 5 tCO₂e of greenhouse-gas emissions.
BEUDO · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 37.3 kBtu/ft² |
| Source EUI | 79.6 kBtu/ft² |
| GHG emissions | 5 tCO₂e |
| GHG intensity | — |
| Electricity | 14,376 kWh |
| Natural gas | 301 therms |
| Water use | 83 kgal |
| Gross floor area | 2,123 sq ft |
| Source record | cambridge:B1202:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 37.3 kBtu/ft² | 5 tCO₂e | |
| 2023 | — | 36.2 kBtu/ft² | 5 tCO₂e | |
| 2022 | — | 37.5 kBtu/ft² | 5 tCO₂e | |
| 2021 | — | 25.5 kBtu/ft² | 4 tCO₂e | |
| 2020 | — | 25.2 kBtu/ft² | 3 tCO₂e | |
| 2019 | — | 27.2 kBtu/ft² | 4 tCO₂e | |
| 2018 | — | 25.8 kBtu/ft² | 4 tCO₂e | |
| 2017 | — | 35.1 kBtu/ft² | 5 tCO₂e | |
| 2016 | — | 31.2 kBtu/ft² | 4 tCO₂e | |
| 2015 | — | 27.1 kBtu/ft² | 4 tCO₂e |
Compliance context
BEUDO
Cambridge's 2023 BEUDO amendments require non-residential buildings of 100,000+ sq ft to reach net-zero emissions by 2035 (reductions starting 2026) and those of 25,000–100,000 sq ft by 2050 (starting 2030).
Ownership
PRESIDENT & FELLOWS OF HARVARD COLLEGE
Own or manage this building? Claim it to correct the record and get compliance alerts.
Location
- Address
- 3 Mellen Street
- City
- Cambridge
- State
- Massachusetts
- Coordinates
- 42.38110, -71.11920
Within ~1 km
Nearby benchmarked buildings
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- 459 Broadwayscore 71
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- 1 Oxford Stscore —
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- 1545 Massachusetts Avenuescore —
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- 1586 Massachusetts Avenuescore —
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- 12 Oxford Stscore —
Laboratory · 261,875 sq ft
See also: most efficient in Cambridge · biggest emitters
How does 3 Mellen Street compare with other multifamily housing buildings in Cambridge?
The latest disclosures cover 187 multifamily housing buildings in Cambridge, out of 902 buildings citywide. Its site EUI of 37.3 kBtu/ft² is about 34% below the average of 56.9 kBtu/ft² — it uses less energy per square foot than the typical building in that group.
At 2,123 sq ft, it is about 98% below the average floor area of 132,415 sq ft for those buildings. It was built in 2007, 34 years later than the group's average year built (1973). 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 3 Mellen Street's energy performance changed over time?
BuildingCensus holds 10 Cambridge disclosures for 3 Mellen Street, covering report years 2015–2024. Site EUI moved from 27.1 kBtu/ft² (2015) to 37.3 kBtu/ft² (2024), an 38% increase. Reported emissions went from 4 tCO₂e to 5 tCO₂e over the same span (up 32%).
What does a site EUI of 37.3 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. 3 Mellen Street's 37.3 kBtu/ft² across 2,123 sq ft works out to about 0.1 billion Btu (23 MWh-equivalent) in 2024. Its source EUI of 79.6 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 14,376 kWh of electricity, 301 therms of natural gas and 83 thousand gallons of water for the year.
Which law requires 3 Mellen Street to report its energy use?
3 Mellen Street reports under BEUDO, the legal basis of Cambridge's Building Energy Use Disclosure Ordinance (BEUDO), which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2024 disclosure (source record cambridge:B1202:2024). Cambridge's 2023 BEUDO amendments require non-residential buildings of 100,000+ sq ft to reach net-zero emissions by 2035 (reductions starting 2026) and those of 25,000–100,000 sq ft by 2050 (starting 2030).
More multifamily housing buildings in Cambridge
Frequently asked questions
What is 3 Mellen Street's energy grade?
3 Mellen Street did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 37.3 kBtu/ft².
How much energy does 3 Mellen Street use?
Its 2024 site energy-use intensity was 37.3 kBtu/ft² (79.6 kBtu/ft² source) across 2,123 sq ft, including 14,376 kWh of electricity and 301 therms of natural gas.
What are 3 Mellen Street's carbon emissions?
3 Mellen Street reported 5 tCO₂e of greenhouse-gas emissions for 2024.
Where is 3 Mellen Street?
3 Mellen Street is in Cambridge, Massachusetts. Its coordinates are 42.38110, -71.11920 (latitude, longitude), as published in the Building Energy Use Disclosure Ordinance (BEUDO) file.
How big is 3 Mellen Street and when was it built?
3 Mellen Street has 2,123 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 2007 as its year built. It is classed as multifamily housing.
Is 3 Mellen Street covered by BEUDO?
Yes — it appears in the 2024 Building Energy Use Disclosure Ordinance (BEUDO) disclosure, which lists the buildings reporting under BEUDO.
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About this data
Source: Building Energy Use Disclosure Ordinance (BEUDO) (BEUDO), as published October 2, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “3 Mellen Street, Cambridge, Massachusetts — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/cambridge/3-mellen-street-7cd4db29 (data as of October 2, 2026).