Gilmanor Apartments
Multifamily Housing in Seattle, WA · 4051 GILMAN AVE W · 98199
At a glance
Gilmanor Apartments is a 23,728-square-foot multifamily housing building at 4051 GILMAN AVE W in Seattle, Washington, built in 1968. In its 2025 Seattle benchmarking disclosure it reported an ENERGY STAR score of 93 out of 100 (grade A), a site energy-use intensity of 23.4 kBtu/ft² and 3 tCO₂e of greenhouse-gas emissions. That score is higher than 55% 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 | 93 (band A) |
| Site EUI | 23.4 kBtu/ft² |
| Source EUI | 65.4 kBtu/ft² |
| GHG emissions | 3 tCO₂e |
| GHG intensity | 0.1 kgCO₂e/ft² |
| Electricity | 162,448 kWh |
| Gross floor area | 23,728 sq ft |
| Source record | seattle:22460:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | 93 | +2 | 23.4 kBtu/ft² | 3 tCO₂e |
| 2024 | 91 | ±0 | 24.1 kBtu/ft² | 3 tCO₂e |
| 2023 | 91 | +2 | 24.2 kBtu/ft² | 3 tCO₂e |
| 2022 | 89 | ±0 | 25.6 kBtu/ft² | 4 tCO₂e |
| 2021 | 89 | +5 | 25.6 kBtu/ft² | 4 tCO₂e |
| 2020 | 84 | -6 | 26.2 kBtu/ft² | 4 tCO₂e |
| 2019 | 90 | +2 | 24.2 kBtu/ft² | 3 tCO₂e |
| 2018 | 88 | -1 | 25.0 kBtu/ft² | 3 tCO₂e |
| 2017 | 89 | +16 | 25.7 kBtu/ft² | 4 tCO₂e |
| 2016 | 73 | -19 | 27.0 kBtu/ft² | 4 tCO₂e |
| 2015 | 92 | 21.8 kBtu/ft² | 3 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
- 4051 GILMAN AVE W
- City
- Seattle
- State
- Washington
- ZIP
- 98199
- Coordinates
- 47.65661, -122.38781
Within ~1 km
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See also: most efficient in Seattle · biggest emitters
How does Gilmanor 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. Gilmanor Apartments's ENERGY STAR score of 93 compares with an average of 83 across the 1,652 that report a score; it scores higher than 55% of them and lower than 42%. Its site EUI of 23.4 kBtu/ft² is about 33% below 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 0.1 kgCO₂e/ft² is about 81% below the group average of 0.7 kgCO₂e/ft².
At 23,728 sq ft, it is about 73% below the average floor area of 86,468 sq ft for those buildings. It was built in 1968, 15 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 Gilmanor Apartments's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for Gilmanor Apartments, covering report years 2015–2025. Its ENERGY STAR score went from 92 in 2015 to 93 in 2025 (+1 points). Site EUI moved from 21.8 kBtu/ft² (2015) to 23.4 kBtu/ft² (2025), an 7% increase. Reported emissions went from 3 tCO₂e to 3 tCO₂e over the same span (up 6%).
What does an ENERGY STAR score of 93 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 93 means the building performs better than about 93% of its national peers. BuildingCensus bands the score into report-card grades; 93 falls in band A — high performer (85–100). 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. Gilmanor Apartments's 23.4 kBtu/ft² across 23,728 sq ft works out to about 0.6 billion Btu (163 MWh-equivalent) in 2025. Its source EUI of 65.4 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 162,448 kWh of electricity for the year.
Which law requires Gilmanor Apartments to report its energy use?
Gilmanor 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:22460:2025). 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
- Malabar Apt· 23,727 sq ft · score 78 (B)
- Admiral Apartments· 23,671 sq ft · score 86 (A)
- Alder Crest Apts.· 23,664 sq ft · score 36 (D)
- Mercer Crest Apt· 23,636 sq ft · score 94 (A)
- Barbara Frietchie· 23,616 sq ft · score 70 (B)
- Manchester Arms· 23,600 sq ft · score 96 (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 Gilmanor Apartments's energy grade?
Gilmanor Apartments scores 93 out of 100 on ENERGY STAR — band A, high performer (85–100) — in its 2025 Seattle disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Gilmanor Apartments use?
Its 2025 site energy-use intensity was 23.4 kBtu/ft² (65.4 kBtu/ft² source) across 23,728 sq ft, including 162,448 kWh of electricity.
What are Gilmanor Apartments's carbon emissions?
Gilmanor Apartments reported 3 tCO₂e of greenhouse-gas emissions (0.1 kgCO₂e/ft²) for 2025.
Where is Gilmanor Apartments?
Gilmanor Apartments is at 4051 GILMAN AVE W, in Seattle, Washington 98199. Its coordinates are 47.65661, -122.38781 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Gilmanor Apartments and when was it built?
Gilmanor Apartments has 23,728 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1968 as its year built. It is classed as multifamily housing.
Is Gilmanor 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, “Gilmanor Apartments, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/gilmanor-apartments-9dfb268f (data as of October 2, 2026).