At a glance
Millennium Tower is a 390,390-square-foot office building at 719 2ND AVE in Seattle, Washington, built in 2000. In its 2025 Seattle benchmarking disclosure it reported an ENERGY STAR score of 82 out of 100 (grade B), a site energy-use intensity of 44.0 kBtu/ft² and 139 tCO₂e of greenhouse-gas emissions. That score is higher than 47% of the 378 scored office buildings in Seattle.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 82 (band B) |
| Site EUI | 44.0 kBtu/ft² |
| Source EUI | 109.0 kBtu/ft² |
| GHG emissions | 139 tCO₂e |
| GHG intensity | 0.6 kgCO₂e/ft² |
| Electricity | 2,339,691 kWh |
| Natural gas | 17,879 therms |
| Gross floor area | 390,390 sq ft |
| Source record | seattle:27145:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | 82 | +1 | 44.0 kBtu/ft² | 139 tCO₂e |
| 2024 | 81 | +8 | 44.6 kBtu/ft² | 139 tCO₂e |
| 2023 | 73 | +12 | 51.2 kBtu/ft² | 168 tCO₂e |
| 2022 | 61 | +2 | 62.6 kBtu/ft² | 256 tCO₂e |
| 2021 | 59 | -16 | 62.7 kBtu/ft² | 199 tCO₂e |
| 2020 | 75 | -7 | 48.6 kBtu/ft² | 149 tCO₂e |
| 2019 | 82 | +8 | 49.9 kBtu/ft² | 150 tCO₂e |
| 2018 | 74 | -13 | 56.2 kBtu/ft² | 74 tCO₂e |
| 2017 | 87 | +5 | 53.8 kBtu/ft² | 71 tCO₂e |
| 2016 | 82 | +4 | 58.2 kBtu/ft² | 77 tCO₂e |
| 2015 | 78 | 59.5 kBtu/ft² | 77 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
- 719 2ND AVE
- City
- Seattle
- State
- Washington
- ZIP
- 98104
- Coordinates
- 47.60331, -122.33389
Within ~1 km
Nearby benchmarked buildings
- Columbia Centerscore 90
Office · 1,952,220 sq ft
- Centurylink Field-Stadiumscore —
Stadium (Open) · 1,913,640 sq ft
- Two Union Squarescore 96
Office · 1,605,578 sq ft
- Russell Investments Centerscore 92
Office · 1,592,914 sq ft
- Us Bank Centerscore 87
Office · 1,536,606 sq ft
Office · 1,527,817 sq ft
See also: most efficient in Seattle · biggest emitters
How does Millennium Tower compare with other office buildings in Seattle?
The latest disclosures cover 497 office buildings in Seattle, out of 3,871 buildings citywide. Millennium Tower's ENERGY STAR score of 82 compares with an average of 76 across the 378 that report a score; it scores higher than 47% of them and lower than 51%. Its site EUI of 44.0 kBtu/ft² is roughly in line with the average of 44.8 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 0.6 kgCO₂e/ft² is about 10% below the group average of 0.7 kgCO₂e/ft².
At 390,390 sq ft, it is about twice the average floor area of 196,452 sq ft for those buildings. It was built in 2000, 35 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 Millennium Tower's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for Millennium Tower, covering report years 2015–2025. Its ENERGY STAR score went from 78 in 2015 to 82 in 2025 (+4 points); its best year on file was 2017, at 87. Site EUI moved from 59.5 kBtu/ft² (2015) to 44.0 kBtu/ft² (2025), a 26% decrease. Reported emissions went from 77 tCO₂e to 139 tCO₂e over the same span (up 81%).
What does an ENERGY STAR score of 82 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 82 means the building performs better than about 82% of its national peers. BuildingCensus bands the score into report-card grades; 82 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. Millennium Tower's 44.0 kBtu/ft² across 390,390 sq ft works out to about 17.2 billion Btu (5,034 MWh-equivalent) in 2025. Its source EUI of 109.0 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 2,339,691 kWh of electricity and 17,879 therms of natural gas for the year.
Which law requires Millennium Tower to report its energy use?
Millennium Tower 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:27145:2025). 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 office buildings in Seattle
- Georgetown Squared· 390,295 sq ft · score 74 (B)
- Dexter Horton Building· 388,934 sq ft · score 92 (A)
- Market Place Tower· 386,321 sq ft · EUI 59.1 kBtu/ft²
- Exchange Building· 384,302 sq ft · score 90 (A)
- 720 Olive Bldg· 383,515 sq ft · score 73 (B)
- West Lake Union Center· 381,511 sq ft · score 90 (A)
- Office buildings in Seattle· 497 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 Millennium Tower's energy grade?
Millennium Tower scores 82 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 Millennium Tower use?
Its 2025 site energy-use intensity was 44.0 kBtu/ft² (109.0 kBtu/ft² source) across 390,390 sq ft, including 2,339,691 kWh of electricity and 17,879 therms of natural gas.
What are Millennium Tower's carbon emissions?
Millennium Tower reported 139 tCO₂e of greenhouse-gas emissions (0.6 kgCO₂e/ft²) for 2025.
Where is Millennium Tower?
Millennium Tower is at 719 2ND AVE, in Seattle, Washington 98104. Its coordinates are 47.60331, -122.33389 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Millennium Tower and when was it built?
Millennium Tower has 390,390 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 2000 as its year built. It is classed as office.
Is Millennium Tower 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, “Millennium Tower, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/millennium-tower-5f7afba3 (data as of October 2, 2026).