At a glance
84 Prospect St is a 26,070-square-foot office building in Cambridge, Massachusetts, built in 1980. In its 2024 Cambridge benchmarking disclosure it reported an ENERGY STAR score of 87 out of 100 (grade A), a site energy-use intensity of 27.7 kBtu/ft² and 52 tCO₂e of greenhouse-gas emissions. That score is higher than 78% of the 94 scored office buildings in Cambridge.
BEUDO · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 87 (band A) |
| Site EUI | 27.7 kBtu/ft² |
| Source EUI | 76.1 kBtu/ft² |
| GHG emissions | 52 tCO₂e |
| GHG intensity | — |
| Electricity | 205,624 kWh |
| Natural gas | 193 therms |
| Water use | 112 kgal |
| Gross floor area | 26,070 sq ft |
| Source record | cambridge:B1809:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 87 | -1 | 27.7 kBtu/ft² | 52 tCO₂e |
| 2023 | 88 | ±0 | 27.0 kBtu/ft² | 50 tCO₂e |
| 2022 | 88 | -2 | 26.7 kBtu/ft² | 50 tCO₂e |
| 2021 | 90 | -10 | 25.0 kBtu/ft² | 47 tCO₂e |
| 2020 | 100 | ±0 | 3.1 kBtu/ft² | 1 tCO₂e |
| 2019 | 100 | 1.6 kBtu/ft² | 2 tCO₂e | |
| 2018 | — | — | 0 tCO₂e | |
| 2017 | — | — | 0 tCO₂e | |
| 2016 | — | — | 0 tCO₂e | |
| 2015 | — | — | 0 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
BURCOMBE, LLC
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Location
- Address
- 84 Prospect St
- City
- Cambridge
- State
- Massachusetts
- Coordinates
- 42.36710, -71.10230
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
- 1493 Cambridge Streetscore 33
Hospital (General Medical & Surgical) · 360,250 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 84 Prospect St compare with other office buildings in Cambridge?
The latest disclosures cover 117 office buildings in Cambridge, out of 902 buildings citywide. 84 Prospect St's ENERGY STAR score of 87 compares with an average of 64 across the 94 that report a score; it scores higher than 78% of them and lower than 17%. Its site EUI of 27.7 kBtu/ft² is about 65% below the average of 78.7 kBtu/ft² — it uses less energy per square foot than the typical building in that group.
At 26,070 sq ft, it is about 78% below the average floor area of 121,167 sq ft for those buildings. It was built in 1980, 15 years later than the group's average year built (1965). Across all 24 jurisdictions BuildingCensus covers, the 15,264 office buildings average an ENERGY STAR score of 73 and a site EUI of 59.3 kBtu/ft².
How has 84 Prospect St's energy performance changed over time?
BuildingCensus holds 10 Cambridge disclosures for 84 Prospect St, covering report years 2015–2024. Its ENERGY STAR score went from 100 in 2019 to 87 in 2024 (-13 points); its best year on file was 2019, at 100. Site EUI moved from 1.6 kBtu/ft² (2019) to 27.7 kBtu/ft² (2024), an 1631% increase.
What does an ENERGY STAR score of 87 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 87 means the building performs better than about 87% of its national peers. BuildingCensus bands the score into report-card grades; 87 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. 84 Prospect St's 27.7 kBtu/ft² across 26,070 sq ft works out to about 0.7 billion Btu (212 MWh-equivalent) in 2024. Its source EUI of 76.1 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 205,624 kWh of electricity, 193 therms of natural gas and 112 thousand gallons of water for the year.
Which law requires 84 Prospect St to report its energy use?
84 Prospect St 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:B1809:2024). 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 office buildings in Cambridge
- One Kendall Square· 25,932 sq ft · score 42 (D)
- 116 Brookline St· 25,182 sq ft · score 74 (B)
- 362 Green Street· 24,263 sq ft · score 89 (A)
- 68 Moulton Street· 23,183 sq ft · score 70 (B)
- 831 Massachusetts Avenue· 21,808 sq ft · score 74 (B)
- Blackstone Street 46· 21,767 sq ft · score 65 (C)
- Office buildings in Cambridge· 117 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 84 Prospect St's energy grade?
84 Prospect St scores 87 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 84 Prospect St use?
Its 2024 site energy-use intensity was 27.7 kBtu/ft² (76.1 kBtu/ft² source) across 26,070 sq ft, including 205,624 kWh of electricity and 193 therms of natural gas.
What are 84 Prospect St's carbon emissions?
84 Prospect St reported 52 tCO₂e of greenhouse-gas emissions for 2024.
Where is 84 Prospect St?
84 Prospect St is in Cambridge, Massachusetts. Its coordinates are 42.36710, -71.10230 (latitude, longitude), as published in the Building Energy Use Disclosure Ordinance (BEUDO) file.
How big is 84 Prospect St and when was it built?
84 Prospect St has 26,070 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1980 as its year built. It is classed as office.
Is 84 Prospect St 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, “84 Prospect St, Cambridge, Massachusetts — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/cambridge/84-prospect-st-7e812e73 (data as of October 2, 2026).