Jefferson Tower
Medical Office in Seattle, WA · 1600 E JEFFERSON ST · 98122
At a glance
Jefferson Tower is a 108,618-square-foot medical office at 1600 E JEFFERSON ST in Seattle, Washington, built in 1987. In its 2025 Seattle benchmarking disclosure it reported an ENERGY STAR score of 76 out of 100 (grade B), a site energy-use intensity of 121.9 kBtu/ft² and 718 tCO₂e of greenhouse-gas emissions. That score is higher than 63% of the 32 scored medical office buildings in Seattle.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 76 (band B) |
| Site EUI | 121.9 kBtu/ft² |
| Source EUI | 215.9 kBtu/ft² |
| GHG emissions | 718 tCO₂e |
| GHG intensity | 6.6 kgCO₂e/ft² |
| Electricity | 1,389,265 kWh |
| Gross floor area | 108,618 sq ft |
| Source record | seattle:671:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | 76 | +27 | 121.9 kBtu/ft² | 718 tCO₂e |
| 2024 | 49 | -5 | 107.2 kBtu/ft² | 200 tCO₂e |
| 2023 | 54 | +1 | 99.3 kBtu/ft² | 136 tCO₂e |
| 2022 | 53 | +8 | 102.1 kBtu/ft² | 156 tCO₂e |
| 2021 | 45 | -25 | 117.2 kBtu/ft² | 303 tCO₂e |
| 2020 | 70 | +12 | 63.1 kBtu/ft² | 221 tCO₂e |
| 2019 | 58 | -8 | 84.9 kBtu/ft² | 388 tCO₂e |
| 2018 | 66 | +42 | 65.2 kBtu/ft² | 192 tCO₂e |
| 2017 | 24 | -42 | 95.3 kBtu/ft² | 61 tCO₂e |
| 2016 | 66 | +12 | 52.4 kBtu/ft² | 35 tCO₂e |
| 2015 | 54 | 63.6 kBtu/ft² | 35 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
- 1600 E JEFFERSON ST
- City
- Seattle
- State
- Washington
- ZIP
- 98122
- Coordinates
- 47.60649, -122.31121
Within ~1 km
Nearby benchmarked buildings
College/University · 2,099,379 sq ft
Hospital (General Medical & Surgical) · 597,519 sq ft
- Emerson (Prev Modera First Hill)score 100
Multifamily Housing · 393,343 sq ft
- Legacy At Pratt Parkscore 93
Multifamily Housing · 371,442 sq ft
- Mason & Main Building Ascore 100
Multifamily Housing · 358,048 sq ft
Medical Office · 320,946 sq ft
See also: most efficient in Seattle · biggest emitters
How does Jefferson Tower compare with other medical office buildings in Seattle?
The latest disclosures cover 45 medical office buildings in Seattle, out of 3,871 buildings citywide. Jefferson Tower's ENERGY STAR score of 76 compares with an average of 60 across the 32 that report a score; it scores higher than 63% of them and lower than 34%. Its site EUI of 121.9 kBtu/ft² is about 38% above the average of 88.3 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 6.6 kgCO₂e/ft² is about 340% above the group average of 1.5 kgCO₂e/ft².
At 108,618 sq ft, it is about 25% below the average floor area of 145,612 sq ft for those buildings. It was built in 1987, 8 years later than the group's average year built (1979). Across all 24 jurisdictions BuildingCensus covers, the 1,266 medical office buildings average an ENERGY STAR score of 64 and a site EUI of 92.2 kBtu/ft².
How has Jefferson Tower's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for Jefferson Tower, covering report years 2015–2025. Its ENERGY STAR score went from 54 in 2015 to 76 in 2025 (+22 points). Site EUI moved from 63.6 kBtu/ft² (2015) to 121.9 kBtu/ft² (2025), an 92% increase. Reported emissions went from 35 tCO₂e to 718 tCO₂e over the same span (up 1957%).
What does an ENERGY STAR score of 76 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 76 means the building performs better than about 76% of its national peers. BuildingCensus bands the score into report-card grades; 76 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. Jefferson Tower's 121.9 kBtu/ft² across 108,618 sq ft works out to about 13.2 billion Btu (3,880 MWh-equivalent) in 2025. Its source EUI of 215.9 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,389,265 kWh of electricity for the year.
Which law requires Jefferson Tower to report its energy use?
Jefferson 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:671:2025). 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 medical office buildings in Seattle
- Tallman Building· 92,477 sq ft · EUI 24.6 kBtu/ft²
- Northway Square East· 86,400 sq ft · score 68 (C)
- NORTHWEST MEDICAL CENTER-demo'd· 83,448 sq ft · score 54 (D)
- Asian Counseling And Referral Service Building· 76,598 sq ft · score 100 (A)
- Office Building, 2111 N NORTHGATE WAY· 76,105 sq ft · score 29 (D)
- Mcmurray Medical Building· 63,909 sq ft · score 48 (D)
- Medical Office buildings in Seattle· 45 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 Jefferson Tower's energy grade?
Jefferson Tower scores 76 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 Jefferson Tower use?
Its 2025 site energy-use intensity was 121.9 kBtu/ft² (215.9 kBtu/ft² source) across 108,618 sq ft, including 1,389,265 kWh of electricity.
What are Jefferson Tower's carbon emissions?
Jefferson Tower reported 718 tCO₂e of greenhouse-gas emissions (6.6 kgCO₂e/ft²) for 2025.
Where is Jefferson Tower?
Jefferson Tower is at 1600 E JEFFERSON ST, in Seattle, Washington 98122. Its coordinates are 47.60649, -122.31121 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Jefferson Tower and when was it built?
Jefferson Tower has 108,618 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1987 as its year built. It is classed as medical office.
Is Jefferson 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, “Jefferson Tower, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/jefferson-tower-a92f5b7f (data as of October 2, 2026).