21 AMES ST
College/University in Cambridge, MA
At a glance
21 AMES ST is a 116,490-square-foot college/university building in Cambridge, Massachusetts, built in 1952. In its 2024 Cambridge benchmarking disclosure it reported a site energy-use intensity of 405.3 kBtu/ft² and 3,058 tCO₂e of greenhouse-gas emissions.
BEUDO · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 405.3 kBtu/ft² |
| Source EUI | 581.8 kBtu/ft² |
| GHG emissions | 3,058 tCO₂e |
| GHG intensity | — |
| Electricity | 2,808,598 kWh |
| Natural gas | 67 therms |
| Water use | 980 kgal |
| Gross floor area | 116,490 sq ft |
| Source record | cambridge:B1526:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 405.3 kBtu/ft² | 3,058 tCO₂e | |
| 2023 | — | 416.7 kBtu/ft² | 3,145 tCO₂e | |
| 2022 | — | 423.1 kBtu/ft² | 3,194 tCO₂e | |
| 2021 | — | 419.7 kBtu/ft² | 3,168 tCO₂e | |
| 2020 | — | 393.3 kBtu/ft² | 2,978 tCO₂e | |
| 2019 | — | 403.9 kBtu/ft² | 3,012 tCO₂e | |
| 2018 | — | 437.7 kBtu/ft² | 3,299 tCO₂e | |
| 2017 | — | 459.4 kBtu/ft² | 3,502 tCO₂e | |
| 2016 | — | 490.0 kBtu/ft² | 3,731 tCO₂e | |
| 2015 | — | 506.2 kBtu/ft² | 3,867 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
- 21 AMES ST
- City
- Cambridge
- State
- Massachusetts
- Coordinates
- 42.36040, -71.09060
Within ~1 km
Nearby benchmarked buildings
- 250 Massachusetts Avenuescore —
Laboratory · 1,362,662 sq ft
- 250 Massachusetts Avenuescore —
Laboratory · 517,029 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
See also: most efficient in Cambridge · biggest emitters
How does 21 AMES 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 405.3 kBtu/ft² is about 163% above the average of 154.3 kBtu/ft² — it uses more energy per square foot than the typical building in that group.
At 116,490 sq ft, it is about 20% above the average floor area of 96,964 sq ft for those buildings. It was built in 1952, 3 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 21 AMES ST's energy performance changed over time?
BuildingCensus holds 10 Cambridge disclosures for 21 AMES ST, covering report years 2015–2024. Site EUI moved from 506.2 kBtu/ft² (2015) to 405.3 kBtu/ft² (2024), a 20% decrease. Reported emissions went from 3,867 tCO₂e to 3,058 tCO₂e over the same span (down 21%).
What does a site EUI of 405.3 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. 21 AMES ST's 405.3 kBtu/ft² across 116,490 sq ft works out to about 47.2 billion Btu (13,837 MWh-equivalent) in 2024. Its source EUI of 581.8 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 2,808,598 kWh of electricity, 67 therms of natural gas and 980 thousand gallons of water for the year.
Which law requires 21 AMES ST to report its energy use?
21 AMES 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:B1526:2024). 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
- 33 MASSACHUSETTS AVE· 116,239 sq ft · EUI 123.0 kBtu/ft²
- 471-476 MEMORIAL DR· 114,930 sq ft · EUI 103.4 kBtu/ft²
- 50 AMES ST· 112,799 sq ft · EUI 522.6 kBtu/ft²
- 7 Divinity Ave· 110,655 sq ft · EUI 238.6 kBtu/ft²
- 120 VASSAR ST· 109,398 sq ft · EUI 176.8 kBtu/ft²
- 70 MEMORIAL DR· 107,991 sq ft · EUI 89.8 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 21 AMES ST's energy grade?
21 AMES ST did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 405.3 kBtu/ft².
How much energy does 21 AMES ST use?
Its 2024 site energy-use intensity was 405.3 kBtu/ft² (581.8 kBtu/ft² source) across 116,490 sq ft, including 2,808,598 kWh of electricity and 67 therms of natural gas.
What are 21 AMES ST's carbon emissions?
21 AMES ST reported 3,058 tCO₂e of greenhouse-gas emissions for 2024.
Where is 21 AMES ST?
21 AMES ST is in Cambridge, Massachusetts. Its coordinates are 42.36040, -71.09060 (latitude, longitude), as published in the Building Energy Use Disclosure Ordinance (BEUDO) file.
How big is 21 AMES ST and when was it built?
21 AMES ST has 116,490 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1952 as its year built. It is classed as college/university.
Is 21 AMES 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, “21 AMES ST, Cambridge, Massachusetts — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/cambridge/21-ames-st-76da090f (data as of October 2, 2026).