At a glance
675 Mass Ave is a 127,880-square-foot office building in Cambridge, Massachusetts, built in 1961. In its 2024 Cambridge benchmarking disclosure it reported an ENERGY STAR score of 54 out of 100 (grade D), a site energy-use intensity of 90.7 kBtu/ft² and 701 tCO₂e of greenhouse-gas emissions. That score is higher than 27% of the 94 scored office buildings in Cambridge.
BEUDO · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 54 (band D) |
| Site EUI | 90.7 kBtu/ft² |
| Source EUI | 164.6 kBtu/ft² |
| GHG emissions | 701 tCO₂e |
| GHG intensity | — |
| Electricity | 1,485,148 kWh |
| Natural gas | 63,023 therms |
| Water use | 1,052 kgal |
| Gross floor area | 127,880 sq ft |
| Source record | cambridge:B1435:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 54 | +6 | 90.7 kBtu/ft² | 701 tCO₂e |
| 2023 | 48 | -15 | 90.2 kBtu/ft² | 727 tCO₂e |
| 2022 | 63 | -5 | 99.5 kBtu/ft² | 716 tCO₂e |
| 2021 | 68 | +5 | 93.0 kBtu/ft² | 667 tCO₂e |
| 2020 | 63 | +14 | 103.2 kBtu/ft² | 725 tCO₂e |
| 2019 | 49 | +23 | 121.0 kBtu/ft² | 835 tCO₂e |
| 2018 | 26 | -35 | 194.4 kBtu/ft² | 1,282 tCO₂e |
| 2017 | 61 | +9 | 97.1 kBtu/ft² | 745 tCO₂e |
| 2016 | 52 | 107.8 kBtu/ft² | 854 tCO₂e | |
| 2015 | — | 21.2 kBtu/ft² | 667 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
U.S. REIF CENTRAL PLAZA MASS. LLC.
Own or manage this building? Claim it to correct the record and get compliance alerts.
Location
- Address
- 675 Mass Ave
- City
- Cambridge
- State
- Massachusetts
- Coordinates
- 42.36600, -71.10380
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
- 45 Sidney Streetscore —
Laboratory · 277,000 sq ft
- 300 Massachusetts Avescore —
Laboratory · 274,456 sq ft
- 235 ALBANY STscore —
College/University · 252,835 sq ft
See also: most efficient in Cambridge · biggest emitters
How does 675 Mass Ave compare with other office buildings in Cambridge?
The latest disclosures cover 117 office buildings in Cambridge, out of 902 buildings citywide. 675 Mass Ave's ENERGY STAR score of 54 compares with an average of 64 across the 94 that report a score; it scores higher than 27% of them and lower than 72%. Its site EUI of 90.7 kBtu/ft² is about 15% above the average of 78.7 kBtu/ft² — it uses more energy per square foot than the typical building in that group.
At 127,880 sq ft, it is roughly in line with the average floor area of 121,167 sq ft for those buildings. It was built in 1961, 4 years earlier 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 675 Mass Ave's energy performance changed over time?
BuildingCensus holds 10 Cambridge disclosures for 675 Mass Ave, covering report years 2015–2024. Its ENERGY STAR score went from 52 in 2016 to 54 in 2024 (+2 points); its best year on file was 2021, at 68. Site EUI moved from 21.2 kBtu/ft² (2015) to 90.7 kBtu/ft² (2024), an 328% increase. Reported emissions went from 667 tCO₂e to 701 tCO₂e over the same span (up 5%).
What does an ENERGY STAR score of 54 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 54 means the building performs better than about 54% of its national peers. BuildingCensus bands the score into report-card grades; 54 falls in band D — lowest band (1–54). It sits 21 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. 675 Mass Ave's 90.7 kBtu/ft² across 127,880 sq ft works out to about 11.6 billion Btu (3,399 MWh-equivalent) in 2024. Its source EUI of 164.6 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,485,148 kWh of electricity, 63,023 therms of natural gas and 1,052 thousand gallons of water for the year.
Which law requires 675 Mass Ave to report its energy use?
675 Mass Ave 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:B1435:2024). 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
- 600 Technology Square· 127,224 sq ft · score 8 (D)
- One Kendall Square· 126,031 sq ft · EUI 100.5 kBtu/ft²
- 625 Massachusetts Ave· 122,104 sq ft · score 77 (B)
- 201 BROADWAY· 119,248 sq ft · score 65 (C)
- 222 Third St.· 118,330 sq ft · score 72 (B)
- 955 Massachusetts Avenue· 115,976 sq ft · score 78 (B)
- 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 675 Mass Ave's energy grade?
675 Mass Ave scores 54 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 675 Mass Ave use?
Its 2024 site energy-use intensity was 90.7 kBtu/ft² (164.6 kBtu/ft² source) across 127,880 sq ft, including 1,485,148 kWh of electricity and 63,023 therms of natural gas.
What are 675 Mass Ave's carbon emissions?
675 Mass Ave reported 701 tCO₂e of greenhouse-gas emissions for 2024.
Where is 675 Mass Ave?
675 Mass Ave is in Cambridge, Massachusetts. Its coordinates are 42.36600, -71.10380 (latitude, longitude), as published in the Building Energy Use Disclosure Ordinance (BEUDO) file.
How big is 675 Mass Ave and when was it built?
675 Mass Ave has 127,880 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1961 as its year built. It is classed as office.
Is 675 Mass Ave 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, “675 Mass Ave, Cambridge, Massachusetts — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/cambridge/675-mass-ave-5c2249e3 (data as of October 2, 2026).