45 CARLETON ST
College/University in Cambridge, MA
At a glance
45 CARLETON ST is a 156,676-square-foot college/university building in Cambridge, Massachusetts, built in 1982. In its 2024 Cambridge benchmarking disclosure it reported a site energy-use intensity of 327.7 kBtu/ft² and 3,324 tCO₂e of greenhouse-gas emissions.
BEUDO · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 327.7 kBtu/ft² |
| Source EUI | 485.9 kBtu/ft² |
| GHG emissions | 3,324 tCO₂e |
| GHG intensity | — |
| Electricity | 3,572,870 kWh |
| Natural gas | 1 therms |
| Water use | 4,357 kgal |
| Gross floor area | 156,676 sq ft |
| Source record | cambridge:B1495:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 327.7 kBtu/ft² | 3,324 tCO₂e | |
| 2023 | — | 521.5 kBtu/ft² | 5,169 tCO₂e | |
| 2022 | — | 398.2 kBtu/ft² | 4,028 tCO₂e | |
| 2021 | — | 340.6 kBtu/ft² | 3,483 tCO₂e | |
| 2020 | — | 350.2 kBtu/ft² | 3,577 tCO₂e | |
| 2019 | — | — | 2,706 tCO₂e | |
| 2018 | — | 314.3 kBtu/ft² | 3,203 tCO₂e | |
| 2017 | — | 327.7 kBtu/ft² | 3,414 tCO₂e | |
| 2016 | — | 345.3 kBtu/ft² | 3,605 tCO₂e | |
| 2015 | — | 394.8 kBtu/ft² | 4,076 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
- 45 CARLETON ST
- City
- Cambridge
- State
- Massachusetts
- Coordinates
- 42.36160, -71.08690
Within ~1 km
Nearby benchmarked buildings
- 50-60 Binney STscore —
Mixed Use Property · 532,739 sq ft
- 325 Main Stscore 87
Office · 494,512 sq ft
- 145 Broadwayscore 91
Office · 490,000 sq ft
- 314 Main St.score 80
Office · 482,220 sq ft
- 303 Binney Stscore —
Laboratory · 480,000 sq ft
- 32 VASSAR STscore —
College/University · 464,005 sq ft
See also: most efficient in Cambridge · biggest emitters
How does 45 CARLETON ST compare with other college/university buildings in Cambridge?
The latest disclosures cover 203 college/university buildings in Cambridge, out of 902 buildings citywide. Its site EUI of 327.7 kBtu/ft² is about twice the average of 154.3 kBtu/ft² — it uses more energy per square foot than the typical building in that group.
At 156,676 sq ft, it is about 62% above the average floor area of 96,964 sq ft for those buildings. It was built in 1982, 33 years later than the group's average year built (1949). Across all 24 jurisdictions BuildingCensus covers, the 2,113 college/university buildings average an ENERGY STAR score of 68 and a site EUI of 98.7 kBtu/ft².
How has 45 CARLETON ST's energy performance changed over time?
BuildingCensus holds 10 Cambridge disclosures for 45 CARLETON ST, covering report years 2015–2024. Site EUI moved from 394.8 kBtu/ft² (2015) to 327.7 kBtu/ft² (2024), a 17% decrease. Reported emissions went from 4,076 tCO₂e to 3,324 tCO₂e over the same span (down 18%).
What does a site EUI of 327.7 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. 45 CARLETON ST's 327.7 kBtu/ft² across 156,676 sq ft works out to about 51.3 billion Btu (15,047 MWh-equivalent) in 2024. Its source EUI of 485.9 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 3,572,870 kWh of electricity, 1 therms of natural gas and 4,357 thousand gallons of water for the year.
Which law requires 45 CARLETON ST to report its energy use?
45 CARLETON 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:B1495:2024). 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 college/university buildings in Cambridge
- 160 MEMORIAL DR· 154,516 sq ft · EUI 146.5 kBtu/ft²
- 550 MEMORIAL DR· 152,315 sq ft · EUI 94.9 kBtu/ft²
- 3 AMES ST· 150,587 sq ft
- 400 MAIN ST· 149,742 sq ft · EUI 179.0 kBtu/ft²
- 50 VASSAR ST· 145,819 sq ft · EUI 406.6 kBtu/ft²
- 150 ALBANY ST· 144,308 sq ft · EUI 309.3 kBtu/ft²
- College/University buildings in Cambridge· 203 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 45 CARLETON ST's energy grade?
45 CARLETON ST did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 327.7 kBtu/ft².
How much energy does 45 CARLETON ST use?
Its 2024 site energy-use intensity was 327.7 kBtu/ft² (485.9 kBtu/ft² source) across 156,676 sq ft, including 3,572,870 kWh of electricity and 1 therms of natural gas.
What are 45 CARLETON ST's carbon emissions?
45 CARLETON ST reported 3,324 tCO₂e of greenhouse-gas emissions for 2024.
Where is 45 CARLETON ST?
45 CARLETON ST is in Cambridge, Massachusetts. Its coordinates are 42.36160, -71.08690 (latitude, longitude), as published in the Building Energy Use Disclosure Ordinance (BEUDO) file.
How big is 45 CARLETON ST and when was it built?
45 CARLETON ST has 156,676 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1982 as its year built. It is classed as college/university.
Is 45 CARLETON 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, “45 CARLETON ST, Cambridge, Massachusetts — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/cambridge/45-carleton-st-9df5b6b2 (data as of October 2, 2026).