Twenty 20 Mad Apartments
Multifamily Housing in Seattle, WA · 2020 E MADISON ST · 98122
At a glance
Twenty 20 Mad Apartments is a 151,166-square-foot multifamily housing building at 2020 E MADISON ST in Seattle, Washington, built in 2017. In its 2025 Seattle benchmarking disclosure it reported a site energy-use intensity of 34.6 kBtu/ft² and 93 tCO₂e of greenhouse-gas emissions.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 34.6 kBtu/ft² |
| Source EUI | 74.4 kBtu/ft² |
| GHG emissions | 93 tCO₂e |
| GHG intensity | 0.8 kgCO₂e/ft² |
| Electricity | 738,398 kWh |
| Natural gas | 14,913 therms |
| Gross floor area | 151,166 sq ft |
| Source record | seattle:50336:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | 34.6 kBtu/ft² | 93 tCO₂e | |
| 2024 | 94 | +2 | 37.6 kBtu/ft² | 110 tCO₂e |
| 2023 | 92 | 41.4 kBtu/ft² | 126 tCO₂e | |
| 2022 | — | 37.5 kBtu/ft² | 115 tCO₂e | |
| 2021 | — | 29.4 kBtu/ft² | 15 tCO₂e | |
| 2020 | 100 | 24.3 kBtu/ft² | 105 tCO₂e | |
| 2019 | — | 29.7 kBtu/ft² | 81 tCO₂e | |
| 2018 | — | 21.2 kBtu/ft² | 78 tCO₂e |
Compliance context
Seattle Energy Benchmarking Ordinance (SMC 22.920)
Seattle's Building Emissions Performance Standard (adopted 2023) applies to buildings over 20,000 sq ft: benchmarking verification is due 2027–2030 and initial emissions targets 2031–2035, reaching net zero by 2041–2050, with fines for non-compliance.
Ownership
No owning organisation shown. Names of private individuals in the disclosure are not published here.
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Location
- Address
- 2020 E MADISON ST
- City
- Seattle
- State
- Washington
- ZIP
- 98122
- Coordinates
- 47.61792, -122.30500
Within ~1 km
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See also: most efficient in Seattle · biggest emitters
How does Twenty 20 Mad Apartments compare with other multifamily housing buildings in Seattle?
The latest disclosures cover 1,971 multifamily housing buildings in Seattle, out of 3,871 buildings citywide. Its site EUI of 34.6 kBtu/ft² is roughly in line with the average of 34.9 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 0.8 kgCO₂e/ft² is about 14% above the group average of 0.7 kgCO₂e/ft².
At 151,166 sq ft, it is about 75% above the average floor area of 86,468 sq ft for those buildings. It was built in 2017, 34 years later than the group's average year built (1983). 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 Twenty 20 Mad Apartments's energy performance changed over time?
BuildingCensus holds 8 Seattle disclosures for Twenty 20 Mad Apartments, covering report years 2018–2025. Its ENERGY STAR score went from 100 in 2020 to 94 in 2024 (-6 points); its best year on file was 2020, at 100. Site EUI moved from 21.2 kBtu/ft² (2018) to 34.6 kBtu/ft² (2025), an 63% increase. Reported emissions went from 78 tCO₂e to 93 tCO₂e over the same span (up 19%).
What does a site EUI of 34.6 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. Twenty 20 Mad Apartments's 34.6 kBtu/ft² across 151,166 sq ft works out to about 5.2 billion Btu (1,533 MWh-equivalent) in 2025. Its source EUI of 74.4 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 738,398 kWh of electricity and 14,913 therms of natural gas for the year.
Which law requires Twenty 20 Mad Apartments to report its energy use?
Twenty 20 Mad Apartments reports under the Seattle Energy Benchmarking Ordinance (SMC 22.920), the legal basis of Seattle's Building Energy Benchmarking program, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2025 disclosure (source record seattle:50336:2025). Seattle's Building Emissions Performance Standard (adopted 2023) applies to buildings over 20,000 sq ft: benchmarking verification is due 2027–2030 and initial emissions targets 2031–2035, reaching net zero by 2041–2050, with fines for non-compliance.
More multifamily housing buildings in Seattle
- Modera Broadway Apartments· 150,335 sq ft · score 92 (A)
- Parla Apt (Conam Crown Hill Apartment)· 150,314 sq ft · score 80 (B)
- Avanti Apartments· 148,474 sq ft · score 98 (A)
- Josephinum· 148,219 sq ft · score 69 (C)
- Ivy Ridge· 147,443 sq ft · score 94 (A)
- Chloe On Madison Apartments· 147,431 sq ft · score 100 (A)
- Multifamily Housing buildings in Seattle· 1,971 benchmarked
- All Seattle benchmarked buildings· Seattle Energy Benchmarking Ordinance (SMC 22.920)
- Most efficient large buildings in Seattle
- Least efficient large buildings in Seattle
- Biggest emitters in Seattle
Frequently asked questions
What is Twenty 20 Mad Apartments's energy grade?
Twenty 20 Mad Apartments did not report an ENERGY STAR score in its 2025 disclosure, but its site energy-use intensity was 34.6 kBtu/ft².
How much energy does Twenty 20 Mad Apartments use?
Its 2025 site energy-use intensity was 34.6 kBtu/ft² (74.4 kBtu/ft² source) across 151,166 sq ft, including 738,398 kWh of electricity and 14,913 therms of natural gas.
What are Twenty 20 Mad Apartments's carbon emissions?
Twenty 20 Mad Apartments reported 93 tCO₂e of greenhouse-gas emissions (0.8 kgCO₂e/ft²) for 2025.
Where is Twenty 20 Mad Apartments?
Twenty 20 Mad Apartments is at 2020 E MADISON ST, in Seattle, Washington 98122. Its coordinates are 47.61792, -122.30500 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Twenty 20 Mad Apartments and when was it built?
Twenty 20 Mad Apartments has 151,166 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 2017 as its year built. It is classed as multifamily housing.
Is Twenty 20 Mad Apartments covered by the Seattle Energy Benchmarking Ordinance (SMC 22.920)?
Yes — it appears in the 2025 Building Energy Benchmarking disclosure, which lists the buildings reporting under the Seattle Energy Benchmarking Ordinance (SMC 22.920).
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About this data
Source: Building Energy Benchmarking (Seattle Energy Benchmarking Ordinance (SMC 22.920)), as published October 2, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “Twenty 20 Mad Apartments, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/twenty-20-mad-apartments-f315d943 (data as of October 2, 2026).