91 Sidney Street
Multifamily Housing in Cambridge, MA
At a glance
91 Sidney Street is a 159,108-square-foot multifamily housing building in Cambridge, Massachusetts, built in 1999. In its 2024 Cambridge benchmarking disclosure it reported an ENERGY STAR score of 19 out of 100 (grade D), a site energy-use intensity of 65.4 kBtu/ft² and 659 tCO₂e of greenhouse-gas emissions. That score is higher than 5% of the 155 scored multifamily housing buildings in Cambridge.
BEUDO · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 19 (band D) |
| Site EUI | 65.4 kBtu/ft² |
| Source EUI | 129.7 kBtu/ft² |
| GHG emissions | 659 tCO₂e |
| GHG intensity | — |
| Electricity | 1,627,271 kWh |
| Natural gas | 48,508 therms |
| Water use | 6,338 kgal |
| Gross floor area | 159,108 sq ft |
| Source record | cambridge:B1004:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 19 | -2 | 65.4 kBtu/ft² | 659 tCO₂e |
| 2023 | 21 | +11 | 63.0 kBtu/ft² | 635 tCO₂e |
| 2022 | 10 | -5 | 77.0 kBtu/ft² | 763 tCO₂e |
| 2021 | 15 | +4 | 71.9 kBtu/ft² | 715 tCO₂e |
| 2020 | 11 | -4 | 75.6 kBtu/ft² | 742 tCO₂e |
| 2019 | 15 | +7 | 76.6 kBtu/ft² | 716 tCO₂e |
| 2018 | 8 | -1 | 81.6 kBtu/ft² | 799 tCO₂e |
| 2017 | 9 | +4 | 74.8 kBtu/ft² | 771 tCO₂e |
| 2016 | 5 | +1 | 76.7 kBtu/ft² | 800 tCO₂e |
| 2015 | 4 | 87.1 kBtu/ft² | 903 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
MASSACHUSETTS INSTITUTE OF TECHNOLOGY
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Location
- Address
- 91 Sidney Street
- City
- Cambridge
- State
- Massachusetts
- Coordinates
- 42.36080, -71.10240
Within ~1 km
Nearby benchmarked buildings
- 250 Massachusetts Avenuescore —
Laboratory · 1,362,662 sq ft
- 250 Massachusetts Avenuescore —
Laboratory · 517,029 sq ft
- 70 PACIFIC STscore —
College/University · 362,687 sq ft
- 575 Memorial Drivescore 37
Hotel · 347,000 sq ft
- 45 Sidney Streetscore —
Laboratory · 277,000 sq ft
- 131 Washington Streetscore 68
Multifamily Housing · 275,666 sq ft
See also: most efficient in Cambridge · biggest emitters
How does 91 Sidney Street compare with other multifamily housing buildings in Cambridge?
The latest disclosures cover 187 multifamily housing buildings in Cambridge, out of 902 buildings citywide. 91 Sidney Street's ENERGY STAR score of 19 compares with an average of 75 across the 155 that report a score; it scores higher than 5% of them and lower than 94%. Its site EUI of 65.4 kBtu/ft² is about 15% above the average of 56.9 kBtu/ft² — it uses more energy per square foot than the typical building in that group.
At 159,108 sq ft, it is about 20% above the average floor area of 132,415 sq ft for those buildings. It was built in 1999, 26 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 91 Sidney Street's energy performance changed over time?
BuildingCensus holds 10 Cambridge disclosures for 91 Sidney Street, covering report years 2015–2024. Its ENERGY STAR score went from 4 in 2015 to 19 in 2024 (+15 points); its best year on file was 2023, at 21. Site EUI moved from 87.1 kBtu/ft² (2015) to 65.4 kBtu/ft² (2024), a 25% decrease. Reported emissions went from 903 tCO₂e to 659 tCO₂e over the same span (down 27%).
What does an ENERGY STAR score of 19 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 19 means the building performs better than about 19% of its national peers. BuildingCensus bands the score into report-card grades; 19 falls in band D — lowest band (1–54). It sits 56 points below 75, the threshold for ENERGY STAR certification. 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. 91 Sidney Street's 65.4 kBtu/ft² across 159,108 sq ft works out to about 10.4 billion Btu (3,050 MWh-equivalent) in 2024. Its source EUI of 129.7 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,627,271 kWh of electricity, 48,508 therms of natural gas and 6,338 thousand gallons of water for the year.
Which law requires 91 Sidney Street to report its energy use?
91 Sidney 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:B1004:2024). 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
- 250 Kendall Street· 155,196 sq ft · score 70 (B)
- 21 Charles St· 152,000 sq ft · score 74 (B)
- 425 Massachusetts Avenue· 151,054 sq ft · score 48 (D)
- 25-31 Wheeler Street· 150,000 sq ft · score 100 (A)
- 808 Memorial Dr· 148,317 sq ft · score 84 (B)
- 975 Memorial Drive· 147,273 sq ft · score 23 (D)
- 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 91 Sidney Street's energy grade?
91 Sidney Street scores 19 out of 100 on ENERGY STAR — band D, lowest band (1–54) — in its 2024 Cambridge disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 91 Sidney Street use?
Its 2024 site energy-use intensity was 65.4 kBtu/ft² (129.7 kBtu/ft² source) across 159,108 sq ft, including 1,627,271 kWh of electricity and 48,508 therms of natural gas.
What are 91 Sidney Street's carbon emissions?
91 Sidney Street reported 659 tCO₂e of greenhouse-gas emissions for 2024.
Where is 91 Sidney Street?
91 Sidney Street is in Cambridge, Massachusetts. Its coordinates are 42.36080, -71.10240 (latitude, longitude), as published in the Building Energy Use Disclosure Ordinance (BEUDO) file.
How big is 91 Sidney Street and when was it built?
91 Sidney Street has 159,108 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1999 as its year built. It is classed as multifamily housing.
Is 91 Sidney 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, “91 Sidney Street, Cambridge, Massachusetts — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/cambridge/91-sidney-street-1fd894df (data as of October 2, 2026).