Ten Twenty
Multifamily Housing in Seattle, WA · 1020 UNIVERSITY ST · 98101
At a glance
Ten Twenty is a 39,895-square-foot multifamily housing building at 1020 UNIVERSITY ST in Seattle, Washington, built in 1962. In its 2025 Seattle benchmarking disclosure it reported an ENERGY STAR score of 75 out of 100 (grade B), a site energy-use intensity of 68.4 kBtu/ft² and 104 tCO₂e of greenhouse-gas emissions. That score is higher than 23% of the 1,652 scored multifamily housing buildings in Seattle.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 75 (band B) |
| Site EUI | 68.4 kBtu/ft² |
| Source EUI | 98.3 kBtu/ft² |
| GHG emissions | 104 tCO₂e |
| GHG intensity | 2.9 kgCO₂e/ft² |
| Electricity | 159,738 kWh |
| Natural gas | 19,204 therms |
| Gross floor area | 39,895 sq ft |
| Source record | seattle:21330:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | 75 | +12 | 68.4 kBtu/ft² | 104 tCO₂e |
| 2024 | 63 | -4 | 75.7 kBtu/ft² | 119 tCO₂e |
| 2023 | 67 | +10 | 73.7 kBtu/ft² | 114 tCO₂e |
| 2022 | 57 | +10 | 82.1 kBtu/ft² | 129 tCO₂e |
| 2021 | 47 | ±0 | 87.4 kBtu/ft² | 138 tCO₂e |
| 2020 | 47 | +7 | 88.8 kBtu/ft² | 147 tCO₂e |
| 2019 | 40 | +13 | 92.3 kBtu/ft² | 151 tCO₂e |
| 2018 | 27 | -4 | 109.8 kBtu/ft² | 162 tCO₂e |
| 2017 | 31 | +5 | 111.3 kBtu/ft² | 162 tCO₂e |
| 2016 | 26 | -8 | 108.6 kBtu/ft² | 159 tCO₂e |
| 2015 | 34 | 93.7 kBtu/ft² | 128 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.
Own or manage this building? Claim it to correct the record and get compliance alerts.
Location
- Address
- 1020 UNIVERSITY ST
- City
- Seattle
- State
- Washington
- ZIP
- 98101
- Coordinates
- 47.61160, -122.32774
Within ~1 km
Nearby benchmarked buildings
Parking · 2,080,885 sq ft
- Columbia Centerscore 90
Office · 1,952,220 sq ft
Hospital (General Medical & Surgical) · 1,926,841 sq ft
- Seattle Convention Centerscore —
Convention Center · 1,842,925 sq ft
- Two Union Squarescore 96
Office · 1,605,578 sq ft
- Onni South Lake Unionscore 77
Multifamily Housing · 1,546,084 sq ft
See also: most efficient in Seattle · biggest emitters
How does Ten Twenty 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. Ten Twenty's ENERGY STAR score of 75 compares with an average of 83 across the 1,652 that report a score; it scores higher than 23% of them and lower than 77%. Its site EUI of 68.4 kBtu/ft² is about twice the average of 34.9 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 2.9 kgCO₂e/ft² is about 310% above the group average of 0.7 kgCO₂e/ft².
At 39,895 sq ft, it is about half of the average floor area of 86,468 sq ft for those buildings. It was built in 1962, 21 years earlier 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 Ten Twenty's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for Ten Twenty, covering report years 2015–2025. Its ENERGY STAR score went from 34 in 2015 to 75 in 2025 (+41 points). Site EUI moved from 93.7 kBtu/ft² (2015) to 68.4 kBtu/ft² (2025), a 27% decrease. Reported emissions went from 128 tCO₂e to 104 tCO₂e over the same span (down 19%).
What does an ENERGY STAR score of 75 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 75 means the building performs better than about 75% of its national peers. BuildingCensus bands the score into report-card grades; 75 falls in band B — above median (70–84). 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 Seattle, 69% 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. Ten Twenty's 68.4 kBtu/ft² across 39,895 sq ft works out to about 2.7 billion Btu (800 MWh-equivalent) in 2025. Its source EUI of 98.3 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 159,738 kWh of electricity and 19,204 therms of natural gas for the year.
Which law requires Ten Twenty to report its energy use?
Ten Twenty 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:21330:2025). 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
- Seaview Terrace Condominium· 39,888 sq ft · score 46 (D)
- Seattle Housing Authority· 39,816 sq ft · score 44 (D)
- Park Meadow Apts· 39,778 sq ft · score 57 (C)
- Park Hamilton· 39,757 sq ft · score 62 (C)
- Jackson Court Condominium· 39,750 sq ft · score 84 (B)
- Gossett Place Apts· 39,636 sq ft · score 60 (C)
- 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 Ten Twenty's energy grade?
Ten Twenty scores 75 out of 100 on ENERGY STAR — band B, above median (70–84) — in its 2025 Seattle disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Ten Twenty use?
Its 2025 site energy-use intensity was 68.4 kBtu/ft² (98.3 kBtu/ft² source) across 39,895 sq ft, including 159,738 kWh of electricity and 19,204 therms of natural gas.
What are Ten Twenty's carbon emissions?
Ten Twenty reported 104 tCO₂e of greenhouse-gas emissions (2.9 kgCO₂e/ft²) for 2025.
Where is Ten Twenty?
Ten Twenty is at 1020 UNIVERSITY ST, in Seattle, Washington 98101. Its coordinates are 47.61160, -122.32774 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Ten Twenty and when was it built?
Ten Twenty has 39,895 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1962 as its year built. It is classed as multifamily housing.
Is Ten Twenty 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).
Working with Seattle building benchmarking records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Ten Twenty, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/ten-twenty-bebc2c08 (data as of October 2, 2026).