At a glance
Arbor Blocks East - Facebook is a 365,449-square-foot office building at 300 8TH AVE N in Seattle, Washington, built in 2018. In its 2025 Seattle benchmarking disclosure it reported a site energy-use intensity of 27.3 kBtu/ft² and 115 tCO₂e of greenhouse-gas emissions.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 27.3 kBtu/ft² |
| Source EUI | 61.3 kBtu/ft² |
| GHG emissions | 115 tCO₂e |
| GHG intensity | 0.5 kgCO₂e/ft² |
| Electricity | 1,201,255 kWh |
| Natural gas | 18,988 therms |
| Gross floor area | 365,449 sq ft |
| Source record | seattle:50362:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | 27.3 kBtu/ft² | 115 tCO₂e | |
| 2024 | 82 | +22 | 44.3 kBtu/ft² | 244 tCO₂e |
| 2023 | 60 | -5 | 70.1 kBtu/ft² | 362 tCO₂e |
| 2022 | 65 | -7 | 64.2 kBtu/ft² | 311 tCO₂e |
| 2021 | 72 | -12 | 52.1 kBtu/ft² | 255 tCO₂e |
| 2020 | 84 | -4 | 49.2 kBtu/ft² | 181 tCO₂e |
| 2019 | 88 | 67.3 kBtu/ft² | 303 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
- 300 8TH AVE N
- City
- Seattle
- State
- Washington
- ZIP
- 98109
- Coordinates
- 47.62131, -122.34075
Within ~1 km
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See also: most efficient in Seattle · biggest emitters
How does Arbor Blocks East - Facebook compare with other office buildings in Seattle?
The latest disclosures cover 497 office buildings in Seattle, out of 3,871 buildings citywide. Its site EUI of 27.3 kBtu/ft² is about 39% below 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 0.5 kgCO₂e/ft² is about 26% below the group average of 0.7 kgCO₂e/ft².
At 365,449 sq ft, it is about 86% above the average floor area of 196,452 sq ft for those buildings. It was built in 2018, 53 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 Arbor Blocks East - Facebook's energy performance changed over time?
BuildingCensus holds 7 Seattle disclosures for Arbor Blocks East - Facebook, covering report years 2019–2025. Its ENERGY STAR score went from 88 in 2019 to 82 in 2024 (-6 points); its best year on file was 2019, at 88. Site EUI moved from 67.3 kBtu/ft² (2019) to 27.3 kBtu/ft² (2025), a 59% decrease. Reported emissions went from 303 tCO₂e to 115 tCO₂e over the same span (down 62%).
What does a site EUI of 27.3 kBtu/ft² mean?
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. Arbor Blocks East - Facebook's 27.3 kBtu/ft² across 365,449 sq ft works out to about 10 billion Btu (2,924 MWh-equivalent) in 2025. Its source EUI of 61.3 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,201,255 kWh of electricity and 18,988 therms of natural gas for the year.
Which law requires Arbor Blocks East - Facebook to report its energy use?
Arbor Blocks East - Facebook 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:50362:2025). 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
- 818 Stewart· 362,033 sq ft · score 84 (B)
- 2601 ELLIOTT AVE· 350,310 sq ft · EUI 13.7 kBtu/ft²
- Tableau (North Edge)· 338,989 sq ft · score 88 (A)
- Stanford Center Offices (Sps-District)· 338,063 sq ft · EUI 44.7 kBtu/ft²
- Alley 24 East· 336,700 sq ft · score 89 (A)
- Ibm Building· 336,330 sq ft · score 66 (C)
- 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 Arbor Blocks East - Facebook's energy grade?
Arbor Blocks East - Facebook did not report an ENERGY STAR score in its 2025 disclosure, but its site energy-use intensity was 27.3 kBtu/ft².
How much energy does Arbor Blocks East - Facebook use?
Its 2025 site energy-use intensity was 27.3 kBtu/ft² (61.3 kBtu/ft² source) across 365,449 sq ft, including 1,201,255 kWh of electricity and 18,988 therms of natural gas.
What are Arbor Blocks East - Facebook's carbon emissions?
Arbor Blocks East - Facebook reported 115 tCO₂e of greenhouse-gas emissions (0.5 kgCO₂e/ft²) for 2025.
Where is Arbor Blocks East - Facebook?
Arbor Blocks East - Facebook is at 300 8TH AVE N, in Seattle, Washington 98109. Its coordinates are 47.62131, -122.34075 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Arbor Blocks East - Facebook and when was it built?
Arbor Blocks East - Facebook has 365,449 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 2018 as its year built. It is classed as office.
Is Arbor Blocks East - Facebook 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, “Arbor Blocks East - Facebook, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/arbor-blocks-east-facebook-e701d2ef (data as of October 2, 2026).