At a glance
Custom Blocks South (923 SE MADISON ST) is a 49,096-square-foot office building at 1355 SE 10TH AVE in Portland, Oregon, built in 1940. In its 2024 Portland benchmarking disclosure it reported an ENERGY STAR score of 99 out of 100 (grade A), a site energy-use intensity of 28.4 kBtu/ft² and 95 tCO₂e of greenhouse-gas emissions. That score is higher than 90% of the 256 scored office buildings in Portland.
Commercial Building Energy Performance Reporting Policy · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 99 (band A) |
| Site EUI | 28.4 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 95 tCO₂e |
| GHG intensity | — |
| Electricity | 148,980 kWh |
| Natural gas | 8,851 therms |
| Gross floor area | 49,096 sq ft |
| Source record | portland_or:1S1E02BD-7100-B1:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 99 | +1 | 28.4 kBtu/ft² | 95 tCO₂e |
| 2023 | 98 | 30.9 kBtu/ft² | 97 tCO₂e |
Compliance context
Commercial Building Energy Performance Reporting Policy
Portland requires commercial buildings over 20,000 sq ft to report energy performance annually, with civil penalties for buildings that fail to comply.
Ownership
No owning organisation shown. Names of private individuals in the disclosure are not published here.
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Location
- Address
- 1355 SE 10TH AVE
- City
- Portland
- State
- Oregon
Within ~1 km
Nearby benchmarked buildings
This source publishes no coordinates, so nearby buildings can't be resolved yet.
See also: most efficient in Portland · biggest emitters
How does Custom Blocks South (923 SE MADISON ST) compare with other office buildings in Portland?
The latest disclosures cover 335 office buildings in Portland, out of 952 buildings citywide. Custom Blocks South (923 SE MADISON ST)'s ENERGY STAR score of 99 compares with an average of 76 across the 256 that report a score; it scores higher than 90% of them and lower than 5%. Its site EUI of 28.4 kBtu/ft² is about 40% below the average of 47.6 kBtu/ft² — it uses less energy per square foot than the typical building in that group.
At 49,096 sq ft, it is about half of the average floor area of 100,908 sq ft for those buildings. It was built in 1940, 17 years earlier than the group's average year built (1957). 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 Custom Blocks South (923 SE MADISON ST)'s energy performance changed over time?
BuildingCensus holds 2 Portland disclosures for Custom Blocks South (923 SE MADISON ST), covering report years 2023–2024. Its ENERGY STAR score went from 98 in 2023 to 99 in 2024 (+1 points). Site EUI moved from 30.9 kBtu/ft² (2023) to 28.4 kBtu/ft² (2024), a 8% decrease. Reported emissions went from 97 tCO₂e to 95 tCO₂e over the same span (down 3%).
What does an ENERGY STAR score of 99 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 99 means the building performs better than about 99% of its national peers. BuildingCensus bands the score into report-card grades; 99 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 Portland, 66% 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. Custom Blocks South (923 SE MADISON ST)'s 28.4 kBtu/ft² across 49,096 sq ft works out to about 1.4 billion Btu (409 MWh-equivalent) in 2024. The disclosure also reports 148,980 kWh of electricity and 8,851 therms of natural gas for the year.
Which law requires Custom Blocks South (923 SE MADISON ST) to report its energy use?
Custom Blocks South (923 SE MADISON ST) reports under the Commercial Building Energy Performance Reporting Policy, the legal basis of Portland's Commercial Building Energy Reporting program, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2024 disclosure (source record portland_or:1S1E02BD-7100-B1:2024). Portland requires commercial buildings over 20,000 sq ft to report energy performance annually, with civil penalties for buildings that fail to comply.
More office buildings in Portland
- Haseltine Building· 48,725 sq ft · score 94 (A)
- Department of Human Services· 48,532 sq ft · score 90 (A)
- River Park Center Building· 48,404 sq ft · score 20 (D)
- Willamette Wharf· 48,384 sq ft · EUI 67.5 kBtu/ft²
- 715 SW MORRISON ST· 47,569 sq ft · score 85 (A)
- Alderway Building· 46,766 sq ft · EUI 23.6 kBtu/ft²
- Office buildings in Portland· 335 benchmarked
- All Portland benchmarked buildings· Commercial Building Energy Performance Reporting Policy
- Most efficient large buildings in Portland
- Least efficient large buildings in Portland
- Biggest emitters in Portland
Frequently asked questions
What is Custom Blocks South (923 SE MADISON ST)'s energy grade?
Custom Blocks South (923 SE MADISON ST) scores 99 out of 100 on ENERGY STAR — band A, high performer (85–100) — in its 2024 Portland disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Custom Blocks South (923 SE MADISON ST) use?
Its 2024 site energy-use intensity was 28.4 kBtu/ft² across 49,096 sq ft, including 148,980 kWh of electricity and 8,851 therms of natural gas.
What are Custom Blocks South (923 SE MADISON ST)'s carbon emissions?
Custom Blocks South (923 SE MADISON ST) reported 95 tCO₂e of greenhouse-gas emissions for 2024.
Where is Custom Blocks South (923 SE MADISON ST)?
Custom Blocks South (923 SE MADISON ST) is at 1355 SE 10TH AVE, in Portland, Oregon.
How big is Custom Blocks South (923 SE MADISON ST) and when was it built?
Custom Blocks South (923 SE MADISON ST) has 49,096 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1940 as its year built. It is classed as office.
Is Custom Blocks South (923 SE MADISON ST) covered by the Commercial Building Energy Performance Reporting Policy?
Yes — it appears in the 2024 Commercial Building Energy Reporting disclosure, which lists the buildings reporting under the Commercial Building Energy Performance Reporting Policy.
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About this data
Source: Commercial Building Energy Reporting (Commercial Building Energy Performance Reporting Policy), as published July 9, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “Custom Blocks South (923 SE MADISON ST), Portland, Oregon — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/portland/custom-blocks-south-923-se-madison-st-bad16dde (data as of July 9, 2026).