At a glance
141 Portland Street is a 135,928-square-foot office building in Cambridge, Massachusetts, built in 1985. In its 2024 Cambridge benchmarking disclosure it reported an ENERGY STAR score of 50 out of 100 (grade D), a site energy-use intensity of 70.3 kBtu/ft² and 650 tCO₂e of greenhouse-gas emissions. That score is higher than 23% of the 94 scored office buildings in Cambridge.
BEUDO · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 50 (band D) |
| Site EUI | 70.3 kBtu/ft² |
| Source EUI | 170.1 kBtu/ft² |
| GHG emissions | 650 tCO₂e |
| GHG intensity | — |
| Electricity | 2,192,284 kWh |
| Natural gas | 20,693 therms |
| Water use | 471 kgal |
| Gross floor area | 135,928 sq ft |
| Source record | cambridge:B1615:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 50 | -19 | 70.3 kBtu/ft² | 650 tCO₂e |
| 2023 | 69 | +17 | 53.2 kBtu/ft² | 498 tCO₂e |
| 2022 | 52 | ±0 | 65.0 kBtu/ft² | 612 tCO₂e |
| 2021 | 52 | -36 | 59.5 kBtu/ft² | 580 tCO₂e |
| 2020 | 88 | +8 | 33.1 kBtu/ft² | 319 tCO₂e |
| 2019 | 80 | +29 | 40.0 kBtu/ft² | 357 tCO₂e |
| 2018 | 51 | -30 | 61.4 kBtu/ft² | 585 tCO₂e |
| 2017 | 81 | +3 | 38.6 kBtu/ft² | 393 tCO₂e |
| 2016 | 78 | -13 | 41.0 kBtu/ft² | 418 tCO₂e |
| 2015 | 91 | 30.7 kBtu/ft² | 320 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.T. FINANCIAL PLANNING CO., INC.
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Location
- Address
- 141 Portland Street
- City
- Cambridge
- State
- Massachusetts
- Coordinates
- 42.36560, -71.09260
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 141 Portland Street compare with other office buildings in Cambridge?
The latest disclosures cover 117 office buildings in Cambridge, out of 902 buildings citywide. 141 Portland Street's ENERGY STAR score of 50 compares with an average of 64 across the 94 that report a score; it scores higher than 23% of them and lower than 74%. Its site EUI of 70.3 kBtu/ft² is about 11% below the average of 78.7 kBtu/ft² — it uses less energy per square foot than the typical building in that group.
At 135,928 sq ft, it is about 12% above the average floor area of 121,167 sq ft for those buildings. It was built in 1985, 20 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 141 Portland Street's energy performance changed over time?
BuildingCensus holds 10 Cambridge disclosures for 141 Portland Street, covering report years 2015–2024. Its ENERGY STAR score went from 91 in 2015 to 50 in 2024 (-41 points); its best year on file was 2015, at 91. Site EUI moved from 30.7 kBtu/ft² (2015) to 70.3 kBtu/ft² (2024), an 129% increase. Reported emissions went from 320 tCO₂e to 650 tCO₂e over the same span (up 103%).
What does an ENERGY STAR score of 50 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 50 means the building performs better than about 50% of its national peers. BuildingCensus bands the score into report-card grades; 50 falls in band D — lowest band (1–54). It sits 25 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. 141 Portland Street's 70.3 kBtu/ft² across 135,928 sq ft works out to about 9.6 billion Btu (2,801 MWh-equivalent) in 2024. Its source EUI of 170.1 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 2,192,284 kWh of electricity, 20,693 therms of natural gas and 471 thousand gallons of water for the year.
Which law requires 141 Portland Street to report its energy use?
141 Portland Street 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:B1615:2024). 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
- 10 Canal Park· 135,710 sq ft · score 66 (C)
- 675 Mass Ave· 127,880 sq ft · score 54 (D)
- 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)
- 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 141 Portland Street's energy grade?
141 Portland Street scores 50 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 141 Portland Street use?
Its 2024 site energy-use intensity was 70.3 kBtu/ft² (170.1 kBtu/ft² source) across 135,928 sq ft, including 2,192,284 kWh of electricity and 20,693 therms of natural gas.
What are 141 Portland Street's carbon emissions?
141 Portland Street reported 650 tCO₂e of greenhouse-gas emissions for 2024.
Where is 141 Portland Street?
141 Portland Street is in Cambridge, Massachusetts. Its coordinates are 42.36560, -71.09260 (latitude, longitude), as published in the Building Energy Use Disclosure Ordinance (BEUDO) file.
How big is 141 Portland Street and when was it built?
141 Portland Street has 135,928 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1985 as its year built. It is classed as office.
Is 141 Portland Street 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, “141 Portland Street, Cambridge, Massachusetts — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/cambridge/141-portland-street-8cb2e8b7 (data as of October 2, 2026).