Twin Oak Apts (Used To Be Exeter House)
Multifamily Housing in Seattle, WA · 720 SENECA ST · 98101
At a glance
Twin Oak Apts (Used To Be Exeter House) is a 164,120-square-foot multifamily housing building at 720 SENECA ST in Seattle, Washington, built in 1926.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | — |
| Source EUI | — |
| GHG emissions | — |
| GHG intensity | — |
| Electricity | 775,598 kWh |
| Gross floor area | 164,120 sq ft |
| Source record | seattle:21484:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | — | — | |
| 2024 | — | 43.4 kBtu/ft² | 330 tCO₂e | |
| 2023 | — | 43.2 kBtu/ft² | 329 tCO₂e | |
| 2022 | — | 42.7 kBtu/ft² | 333 tCO₂e | |
| 2021 | — | 38.5 kBtu/ft² | 282 tCO₂e | |
| 2020 | — | 36.5 kBtu/ft² | 302 tCO₂e | |
| 2019 | 87 | +86 | 43.1 kBtu/ft² | 345 tCO₂e |
| 2018 | 1 | -99 | 91.0 kBtu/ft² | 386 tCO₂e |
| 2017 | 100 | +96 | 24.9 kBtu/ft² | 323 tCO₂e |
| 2016 | 4 | +3 | 45.8 kBtu/ft² | 359 tCO₂e |
| 2015 | 1 | 53.0 kBtu/ft² | 398 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
- 720 SENECA ST
- City
- Seattle
- State
- Washington
- ZIP
- 98101
- Coordinates
- 47.60954, -122.33025
Within ~1 km
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See also: most efficient in Seattle · biggest emitters
How does Twin Oak Apts (Used To Be Exeter House) 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.
At 164,120 sq ft, it is about 90% above the average floor area of 86,468 sq ft for those buildings. It was built in 1926, 57 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 Twin Oak Apts (Used To Be Exeter House)'s energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for Twin Oak Apts (Used To Be Exeter House), covering report years 2015–2025. Its ENERGY STAR score went from 1 in 2015 to 87 in 2019 (+86 points); its best year on file was 2017, at 100. Site EUI moved from 53.0 kBtu/ft² (2015) to 43.4 kBtu/ft² (2024), a 18% decrease. Reported emissions went from 398 tCO₂e to 330 tCO₂e over the same span (down 17%).
Which law requires Twin Oak Apts (Used To Be Exeter House) to report its energy use?
Twin Oak Apts (Used To Be Exeter House) 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:21484:2025). 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
- Willow Crossing Apartments· 163,673 sq ft · score 97 (A)
- Klee Condominium· 162,865 sq ft · score 39 (D)
- Springline Apartments· 161,999 sq ft · score 93 (A)
- Yesler Family Housing· 161,940 sq ft · score 75 (B)
- Joseph Arnold Lofts· 161,722 sq ft · score 95 (A)
- Hayes Apartments· 160,743 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 Twin Oak Apts (Used To Be Exeter House)'s energy grade?
Twin Oak Apts (Used To Be Exeter House) did not report an ENERGY STAR score in its 2025 disclosure.
How much energy does Twin Oak Apts (Used To Be Exeter House) use?
No energy-use intensity was reported for 2025.
What are Twin Oak Apts (Used To Be Exeter House)'s carbon emissions?
No greenhouse-gas emissions figure was reported for 2025.
Where is Twin Oak Apts (Used To Be Exeter House)?
Twin Oak Apts (Used To Be Exeter House) is at 720 SENECA ST, in Seattle, Washington 98101. Its coordinates are 47.60954, -122.33025 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Twin Oak Apts (Used To Be Exeter House) and when was it built?
Twin Oak Apts (Used To Be Exeter House) has 164,120 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1926 as its year built. It is classed as multifamily housing.
Is Twin Oak Apts (Used To Be Exeter House) 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, “Twin Oak Apts (Used To Be Exeter House), Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/twin-oak-apts-used-to-be-exeter-house-673e1655 (data as of October 2, 2026).