303 Third St
Multifamily Housing in Cambridge, MA
At a glance
303 Third St is a 324,872-square-foot multifamily housing building in Cambridge, Massachusetts, built in 2009. In its 2024 Cambridge benchmarking disclosure it reported an ENERGY STAR score of 67 out of 100 (grade C), a site energy-use intensity of 58.9 kBtu/ft² and 1,179 tCO₂e of greenhouse-gas emissions. That score is higher than 30% of the 155 scored multifamily housing buildings in Cambridge.
BEUDO · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 67 (band C) |
| Site EUI | 58.9 kBtu/ft² |
| Source EUI | 107.8 kBtu/ft² |
| GHG emissions | 1,179 tCO₂e |
| GHG intensity | — |
| Electricity | 2,499,236 kWh |
| Natural gas | 105,984 therms |
| Water use | 10,018 kgal |
| Gross floor area | 324,872 sq ft |
| Source record | cambridge:B1685:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 67 | -6 | 58.9 kBtu/ft² | 1,179 tCO₂e |
| 2023 | 73 | +6 | 54.6 kBtu/ft² | 1,101 tCO₂e |
| 2022 | 67 | +6 | 61.6 kBtu/ft² | 1,222 tCO₂e |
| 2021 | 61 | -13 | 63.8 kBtu/ft² | 1,268 tCO₂e |
| 2020 | 74 | +6 | 58.3 kBtu/ft² | 1,149 tCO₂e |
| 2019 | 68 | +3 | 60.1 kBtu/ft² | 1,149 tCO₂e |
| 2018 | 65 | +5 | 62.3 kBtu/ft² | 1,234 tCO₂e |
| 2017 | 60 | -5 | 59.9 kBtu/ft² | 1,245 tCO₂e |
| 2016 | 65 | +6 | 56.7 kBtu/ft² | 1,185 tCO₂e |
| 2015 | 59 | 59.9 kBtu/ft² | 1,282 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
303 THIRD SPE LLC
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Location
- Address
- 303 Third St
- City
- Cambridge
- State
- Massachusetts
- Coordinates
- 42.36440, -71.08390
Within ~1 km
Nearby benchmarked buildings
- 100 Cambridge Side Placescore —
Enclosed Mall · 747,697 sq ft
- 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
See also: most efficient in Cambridge · biggest emitters
How does 303 Third St compare with other multifamily housing buildings in Cambridge?
The latest disclosures cover 187 multifamily housing buildings in Cambridge, out of 902 buildings citywide. 303 Third St's ENERGY STAR score of 67 compares with an average of 75 across the 155 that report a score; it scores higher than 30% of them and lower than 68%. Its site EUI of 58.9 kBtu/ft² is roughly in line with the average of 56.9 kBtu/ft².
At 324,872 sq ft, it is about 145% above the average floor area of 132,415 sq ft for those buildings. It was built in 2009, 36 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 303 Third St's energy performance changed over time?
BuildingCensus holds 10 Cambridge disclosures for 303 Third St, covering report years 2015–2024. Its ENERGY STAR score went from 59 in 2015 to 67 in 2024 (+8 points); its best year on file was 2020, at 74. Site EUI moved from 59.9 kBtu/ft² (2015) to 58.9 kBtu/ft² (2024), a 2% decrease. Reported emissions went from 1,282 tCO₂e to 1,179 tCO₂e over the same span (down 8%).
What does an ENERGY STAR score of 67 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 67 means the building performs better than about 67% of its national peers. BuildingCensus bands the score into report-card grades; 67 falls in band C — below median (55–69). It sits 8 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. 303 Third St's 58.9 kBtu/ft² across 324,872 sq ft works out to about 19.1 billion Btu (5,608 MWh-equivalent) in 2024. Its source EUI of 107.8 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 2,499,236 kWh of electricity, 105,984 therms of natural gas and 10,018 thousand gallons of water for the year.
Which law requires 303 Third St to report its energy use?
303 Third 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:B1685:2024). 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
- 2 Earhart Street· 309,535 sq ft · score 76 (B)
- 1 First Street· 291,742 sq ft · score 80 (B)
- 812 Memorial Dr· 283,150 sq ft · score 99 (A)
- 100 Memorial Dr· 280,000 sq ft · score 66 (C)
- 131 Washington Street· 275,666 sq ft · score 68 (C)
- 402 Rindge Avenue· 264,000 sq ft · score 88 (A)
- 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 303 Third St's energy grade?
303 Third St scores 67 out of 100 on ENERGY STAR — band C, below median (55–69) — in its 2024 Cambridge disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 303 Third St use?
Its 2024 site energy-use intensity was 58.9 kBtu/ft² (107.8 kBtu/ft² source) across 324,872 sq ft, including 2,499,236 kWh of electricity and 105,984 therms of natural gas.
What are 303 Third St's carbon emissions?
303 Third St reported 1,179 tCO₂e of greenhouse-gas emissions for 2024.
Where is 303 Third St?
303 Third St is in Cambridge, Massachusetts. Its coordinates are 42.36440, -71.08390 (latitude, longitude), as published in the Building Energy Use Disclosure Ordinance (BEUDO) file.
How big is 303 Third St and when was it built?
303 Third St has 324,872 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 2009 as its year built. It is classed as multifamily housing.
Is 303 Third 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, “303 Third St, Cambridge, Massachusetts — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/cambridge/303-third-st-6f139b93 (data as of October 2, 2026).