221 Mount Auburn Street
Multifamily Housing in Cambridge, MA
At a glance
221 Mount Auburn Street is a 126,258-square-foot multifamily housing building in Cambridge, Massachusetts, built in 1960. In its 2024 Cambridge benchmarking disclosure it reported an ENERGY STAR score of 93 out of 100 (grade A), a site energy-use intensity of 57.9 kBtu/ft² and 422 tCO₂e of greenhouse-gas emissions. That score is higher than 66% of the 155 scored multifamily housing buildings in Cambridge.
BEUDO · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 93 (band A) |
| Site EUI | 57.9 kBtu/ft² |
| Source EUI | 84.9 kBtu/ft² |
| GHG emissions | 422 tCO₂e |
| GHG intensity | — |
| Electricity | 508,103 kWh |
| Natural gas | 55,828 therms |
| Water use | 1,828 kgal |
| Gross floor area | 126,258 sq ft |
| Source record | cambridge:B1713:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 93 | +1 | 57.9 kBtu/ft² | 422 tCO₂e |
| 2023 | 92 | +8 | 58.1 kBtu/ft² | 423 tCO₂e |
| 2022 | 84 | -3 | 64.3 kBtu/ft² | 469 tCO₂e |
| 2021 | 87 | +5 | 60.3 kBtu/ft² | 444 tCO₂e |
| 2020 | 82 | +8 | 61.3 kBtu/ft² | 452 tCO₂e |
| 2019 | 74 | -2 | 69.1 kBtu/ft² | 494 tCO₂e |
| 2018 | 76 | ±0 | 69.1 kBtu/ft² | 506 tCO₂e |
| 2017 | 76 | -3 | 67.1 kBtu/ft² | 501 tCO₂e |
| 2016 | 79 | -20 | 65.2 kBtu/ft² | 489 tCO₂e |
| 2015 | 99 | 35.6 kBtu/ft² | 530 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
Condo Building
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Location
- Address
- 221 Mount Auburn Street
- City
- Cambridge
- State
- Massachusetts
- Coordinates
- 42.37510, -71.12970
Within ~1 km
Nearby benchmarked buildings
- 330 Mount Auburn Stscore 76
Hospital (General Medical & Surgical) · 652,524 sq ft
- 1 Bennet Streetscore 67
Hotel · 498,000 sq ft
- 46-56 Linnaean Streetscore —
Residence Hall/Dormitory · 251,014 sq ft
- 99 Brattle Stscore —
College/University · 210,512 sq ft
- 124 Mount Auburn Streetscore 70
Office · 196,007 sq ft
- 64 Linnaean Streetscore —
Residence Hall/Dormitory · 191,944 sq ft
See also: most efficient in Cambridge · biggest emitters
How does 221 Mount Auburn Street compare with other multifamily housing buildings in Cambridge?
The latest disclosures cover 187 multifamily housing buildings in Cambridge, out of 902 buildings citywide. 221 Mount Auburn Street's ENERGY STAR score of 93 compares with an average of 75 across the 155 that report a score; it scores higher than 66% of them and lower than 29%. Its site EUI of 57.9 kBtu/ft² is roughly in line with the average of 56.9 kBtu/ft².
At 126,258 sq ft, it is roughly in line with the average floor area of 132,415 sq ft for those buildings. It was built in 1960, 13 years earlier 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 221 Mount Auburn Street's energy performance changed over time?
BuildingCensus holds 10 Cambridge disclosures for 221 Mount Auburn Street, covering report years 2015–2024. Its ENERGY STAR score went from 99 in 2015 to 93 in 2024 (-6 points); its best year on file was 2015, at 99. Site EUI moved from 35.6 kBtu/ft² (2015) to 57.9 kBtu/ft² (2024), an 63% increase. Reported emissions went from 530 tCO₂e to 422 tCO₂e over the same span (down 20%).
What does an ENERGY STAR score of 93 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 93 means the building performs better than about 93% of its national peers. BuildingCensus bands the score into report-card grades; 93 falls in band A — high performer (85–100). Scores of 75 or higher meet the threshold for ENERGY STAR certification; certification itself is a separate, verified application that the disclosure does not record. In Cambridge, 50% 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. 221 Mount Auburn Street's 57.9 kBtu/ft² across 126,258 sq ft works out to about 7.3 billion Btu (2,142 MWh-equivalent) in 2024. Its source EUI of 84.9 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 508,103 kWh of electricity, 55,828 therms of natural gas and 1,828 thousand gallons of water for the year.
Which law requires 221 Mount Auburn Street to report its energy use?
221 Mount Auburn 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:B1713:2024). 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
- 64 Magee Street· 126,002 sq ft · score 93 (A)
- 150 Erie Street· 124,302 sq ft · score 77 (B)
- 1105 Mass. Ave· 122,297 sq ft · score 39 (D)
- 19-21 Garden Street· 121,527 sq ft · score 84 (B)
- 929 Massachusetts Ave.· 120,066 sq ft · score 78 (B)
- 10 Magazine St.· 119,854 sq ft · score 97 (A)
- Multifamily Housing buildings in Cambridge· 187 benchmarked
- All Cambridge benchmarked buildings· BEUDO
- Most efficient large buildings in Cambridge
- Least efficient large buildings in Cambridge
- Biggest emitters in Cambridge
Frequently asked questions
What is 221 Mount Auburn Street's energy grade?
221 Mount Auburn Street scores 93 out of 100 on ENERGY STAR — band A, high performer (85–100) — in its 2024 Cambridge disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 221 Mount Auburn Street use?
Its 2024 site energy-use intensity was 57.9 kBtu/ft² (84.9 kBtu/ft² source) across 126,258 sq ft, including 508,103 kWh of electricity and 55,828 therms of natural gas.
What are 221 Mount Auburn Street's carbon emissions?
221 Mount Auburn Street reported 422 tCO₂e of greenhouse-gas emissions for 2024.
Where is 221 Mount Auburn Street?
221 Mount Auburn Street is in Cambridge, Massachusetts. Its coordinates are 42.37510, -71.12970 (latitude, longitude), as published in the Building Energy Use Disclosure Ordinance (BEUDO) file.
How big is 221 Mount Auburn Street and when was it built?
221 Mount Auburn Street has 126,258 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1960 as its year built. It is classed as multifamily housing.
Is 221 Mount Auburn 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, “221 Mount Auburn Street, Cambridge, Massachusetts — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/cambridge/221-mount-auburn-street-9622503a (data as of October 2, 2026).