205-225 Walden St.
Multifamily Housing in Cambridge, MA
At a glance
205-225 Walden St. is a 229,040-square-foot multifamily housing building in Cambridge, Massachusetts, built in 1966. In its 2024 Cambridge benchmarking disclosure it reported an ENERGY STAR score of 89 out of 100 (grade A), a site energy-use intensity of 58.7 kBtu/ft² and 773 tCO₂e of greenhouse-gas emissions. That score is higher than 59% of the 155 scored multifamily housing buildings in Cambridge.
BEUDO · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 89 (band A) |
| Site EUI | 58.7 kBtu/ft² |
| Source EUI | 85.2 kBtu/ft² |
| GHG emissions | 773 tCO₂e |
| GHG intensity | — |
| Electricity | 904,853 kWh |
| Natural gas | 103,558 therms |
| Water use | 5,783 kgal |
| Gross floor area | 229,040 sq ft |
| Source record | cambridge:B1680:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 89 | -3 | 58.7 kBtu/ft² | 773 tCO₂e |
| 2023 | 92 | +10 | 54.9 kBtu/ft² | 724 tCO₂e |
| 2022 | 82 | -5 | 67.5 kBtu/ft² | 882 tCO₂e |
| 2021 | 87 | +2 | 62.2 kBtu/ft² | 817 tCO₂e |
| 2020 | 85 | ±0 | 64.9 kBtu/ft² | 844 tCO₂e |
| 2019 | 85 | +7 | 68.6 kBtu/ft² | 870 tCO₂e |
| 2018 | 78 | -3 | 74.5 kBtu/ft² | 961 tCO₂e |
| 2017 | 81 | +6 | 68.8 kBtu/ft² | 906 tCO₂e |
| 2016 | 75 | -2 | 71.2 kBtu/ft² | 940 tCO₂e |
| 2015 | 77 | 74.2 kBtu/ft² | 980 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
EQR-WALDEN PARK, LLC
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Location
- Address
- 205-225 Walden St.
- City
- Cambridge
- State
- Massachusetts
- Coordinates
- 42.38700, -71.13040
Within ~1 km
Nearby benchmarked buildings
- 46-56 Linnaean Streetscore —
Residence Hall/Dormitory · 251,014 sq ft
- 21 Walden Square Roadscore 86
Multifamily Housing · 250,389 sq ft
- 362 Rindge Avescore 57
Multifamily Housing · 249,723 sq ft
- 1 Jackson Placescore 88
Multifamily Housing · 207,765 sq ft
- 1 Jackson Placescore 73
Multifamily Housing · 207,765 sq ft
- 64 Linnaean Streetscore —
Residence Hall/Dormitory · 191,944 sq ft
See also: most efficient in Cambridge · biggest emitters
How does 205-225 Walden St. compare with other multifamily housing buildings in Cambridge?
The latest disclosures cover 187 multifamily housing buildings in Cambridge, out of 902 buildings citywide. 205-225 Walden St.'s ENERGY STAR score of 89 compares with an average of 75 across the 155 that report a score; it scores higher than 59% of them and lower than 39%. Its site EUI of 58.7 kBtu/ft² is roughly in line with the average of 56.9 kBtu/ft².
At 229,040 sq ft, it is about 73% above the average floor area of 132,415 sq ft for those buildings. It was built in 1966, 7 years earlier 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 205-225 Walden St.'s energy performance changed over time?
BuildingCensus holds 10 Cambridge disclosures for 205-225 Walden St., covering report years 2015–2024. Its ENERGY STAR score went from 77 in 2015 to 89 in 2024 (+12 points); its best year on file was 2023, at 92. Site EUI moved from 74.2 kBtu/ft² (2015) to 58.7 kBtu/ft² (2024), a 21% decrease. Reported emissions went from 980 tCO₂e to 773 tCO₂e over the same span (down 21%).
What does an ENERGY STAR score of 89 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 89 means the building performs better than about 89% of its national peers. BuildingCensus bands the score into report-card grades; 89 falls in band A — high performer (85–100). Scores of 75 or higher meet the threshold for ENERGY STAR certification; certification itself is a separate, verified application that the disclosure does not record. 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. 205-225 Walden St.'s 58.7 kBtu/ft² across 229,040 sq ft works out to about 13.4 billion Btu (3,940 MWh-equivalent) in 2024. Its source EUI of 85.2 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 904,853 kWh of electricity, 103,558 therms of natural gas and 5,783 thousand gallons of water for the year.
Which law requires 205-225 Walden St. to report its energy use?
205-225 Walden 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:B1680:2024). 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
- 80 Cambridgepark Drive· 225,358 sq ft · score 96 (A)
- 4-6 Canal Park· 219,456 sq ft · score 94 (A)
- 15 Lambert Street· 215,544 sq ft · score 44 (D)
- 195 Binney St.· 213,000 sq ft · score 56 (C)
- 5 Cowperthwaite Street· 211,715 sq ft · score 96 (A)
- 1 Jackson Place· 207,765 sq ft · score 73 (B)
- 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 205-225 Walden St.'s energy grade?
205-225 Walden St. scores 89 out of 100 on ENERGY STAR — band A, high performer (85–100) — in its 2024 Cambridge disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 205-225 Walden St. use?
Its 2024 site energy-use intensity was 58.7 kBtu/ft² (85.2 kBtu/ft² source) across 229,040 sq ft, including 904,853 kWh of electricity and 103,558 therms of natural gas.
What are 205-225 Walden St.'s carbon emissions?
205-225 Walden St. reported 773 tCO₂e of greenhouse-gas emissions for 2024.
Where is 205-225 Walden St.?
205-225 Walden St. is in Cambridge, Massachusetts. Its coordinates are 42.38700, -71.13040 (latitude, longitude), as published in the Building Energy Use Disclosure Ordinance (BEUDO) file.
How big is 205-225 Walden St. and when was it built?
205-225 Walden St. has 229,040 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1966 as its year built. It is classed as multifamily housing.
Is 205-225 Walden 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, “205-225 Walden St., Cambridge, Massachusetts — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/cambridge/205-225-walden-st-cf5c23c7 (data as of October 2, 2026).