5 Union Whf
Multifamily Housing in Boston, MA · 2109.
At a glance
5 Union Whf is a 9,181-square-foot multifamily housing building in Boston, Massachusetts. In its 2024 Boston benchmarking disclosure it reported a site energy-use intensity of 33.6 kBtu/ft² and 17 tCO₂e of greenhouse-gas emissions.
BERDO 2.0 · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 33.6 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 17 tCO₂e |
| GHG intensity | — |
| Electricity | 66,415 kWh |
| Natural gas | 817 therms |
| Gross floor area | 9,181 sq ft |
| Source record | boston:106450:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 33.6 kBtu/ft² | 17 tCO₂e | |
| 2023 | — | 32.5 kBtu/ft² | 17 tCO₂e | |
| 2022 | — | 30.3 kBtu/ft² | 20 tCO₂e |
Compliance context
BERDO 2.0
BERDO 2.0 sets emissions standards for buildings of 20,000+ sq ft or 15+ units, starting in 2025 or 2030 depending on building size, with an alternative-compliance payment of $234 per metric ton of CO₂e over the limit.
Ownership
UNION WHARF CONDOMINIUM TR
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Location
- Address
- 5 Union Whf
- City
- Boston
- State
- Massachusetts
- ZIP
- 2109.
Within ~1 km
Nearby benchmarked buildings
This source publishes no coordinates, so nearby buildings can't be resolved yet.
See also: most efficient in Boston · biggest emitters
How does 5 Union Whf compare with other multifamily housing buildings in Boston?
The latest disclosures cover 2,174 multifamily housing buildings in Boston, out of 6,305 buildings citywide. Its site EUI of 33.6 kBtu/ft² is about half of the average of 67.7 kBtu/ft² — it uses less energy per square foot than the typical building in that group.
At 9,181 sq ft, it is about 84% below the average floor area of 58,087 sq ft for those buildings. 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 5 Union Whf's energy performance changed over time?
BuildingCensus holds 3 Boston disclosures for 5 Union Whf, covering report years 2022–2024. Site EUI moved from 30.3 kBtu/ft² (2022) to 33.6 kBtu/ft² (2024), an 11% increase. Reported emissions went from 20 tCO₂e to 17 tCO₂e over the same span (down 13%).
What does a site EUI of 33.6 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. 5 Union Whf's 33.6 kBtu/ft² across 9,181 sq ft works out to about 0.3 billion Btu (90 MWh-equivalent) in 2024. The disclosure also reports 66,415 kWh of electricity and 817 therms of natural gas for the year.
Which law requires 5 Union Whf to report its energy use?
5 Union Whf reports under BERDO 2.0, the legal basis of Boston's Building Emissions Reduction and Disclosure Ordinance, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2024 disclosure (source record boston:106450:2024). BERDO 2.0 sets emissions standards for buildings of 20,000+ sq ft or 15+ units, starting in 2025 or 2030 depending on building size, with an alternative-compliance payment of $234 per metric ton of CO₂e over the limit.
More multifamily housing buildings in Boston
- 159 Worcester St· 9,104 sq ft · EUI 29.0 kBtu/ft²
- 218 Florence St· 9,072 sq ft · EUI 60.6 kBtu/ft²
- 27 Harrison St· 9,072 sq ft · EUI 64.6 kBtu/ft²
- 33 Harrison St· 9,072 sq ft · EUI 47.6 kBtu/ft²
- 37 Harrison St· 9,072 sq ft · EUI 53.7 kBtu/ft²
- 41 Harrison St· 9,072 sq ft · EUI 49.9 kBtu/ft²
- Multifamily Housing buildings in Boston· 2,174 benchmarked
- All Boston benchmarked buildings· BERDO 2.0
- Most efficient large buildings in Boston
- Least efficient large buildings in Boston
- Biggest emitters in Boston
Frequently asked questions
What is 5 Union Whf's energy grade?
5 Union Whf did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 33.6 kBtu/ft².
How much energy does 5 Union Whf use?
Its 2024 site energy-use intensity was 33.6 kBtu/ft² across 9,181 sq ft, including 66,415 kWh of electricity and 817 therms of natural gas.
What are 5 Union Whf's carbon emissions?
5 Union Whf reported 17 tCO₂e of greenhouse-gas emissions for 2024.
Where is 5 Union Whf?
5 Union Whf is in Boston, Massachusetts 2109.
How big is 5 Union Whf and when was it built?
5 Union Whf has 9,181 sq ft of gross floor area, as reported in its 2024 disclosure. It is classed as multifamily housing.
Is 5 Union Whf covered by BERDO 2.0?
Yes — it appears in the 2024 Building Emissions Reduction and Disclosure Ordinance disclosure, which lists the buildings reporting under BERDO 2.0.
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About this data
Source: Building Emissions Reduction and Disclosure Ordinance (BERDO 2.0), as published July 9, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “5 Union Whf, Boston, Massachusetts — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/boston/5-union-whf-d7478d2a (data as of July 9, 2026).