Walsh Annex
Multifamily Housing in Denver, CO · 1775 W. Mosier Pl · 80223
At a glance
Walsh Annex is a 68,706-square-foot multifamily housing building at 1775 W. Mosier Pl in Denver, Colorado, built in 1971. In its 2023 Denver benchmarking disclosure it reported an ENERGY STAR score of 75 out of 100 (grade B), a site energy-use intensity of 63.5 kBtu/ft² and 422 tCO₂e of greenhouse-gas emissions. That score is higher than 32% of the 956 scored multifamily housing buildings in Denver.
Energize Denver Building Performance Policy · reporting year 2023
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 75 (band B) |
| Site EUI | 63.5 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 422 tCO₂e |
| GHG intensity | — |
| Electricity | 557,902 kWh |
| Natural gas | 23,961 therms |
| Gross floor area | 68,706 sq ft |
| Source record | denver:5249:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 75 | -8 | 63.5 kBtu/ft² | 422 tCO₂e |
| 2022 | 83 | +4 | 61.1 kBtu/ft² | 401 tCO₂e |
| 2021 | 79 | 61.3 kBtu/ft² | 433 tCO₂e |
Compliance context
Energize Denver Building Performance Policy
Energize Denver sets energy-use (EUI) targets for buildings of 25,000+ sq ft — for most buildings an interim target in 2028 and a final target in 2032 — with civil penalties of roughly $0.15–0.35 per kBtu over target 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
- 1775 W. Mosier Pl
- City
- Denver
- State
- Colorado
- ZIP
- 80223
Within ~1 km
Nearby benchmarked buildings
This source publishes no coordinates, so nearby buildings can't be resolved yet.
See also: most efficient in Denver · biggest emitters
How does Walsh Annex compare with other multifamily housing buildings in Denver?
The latest disclosures cover 1,108 multifamily housing buildings in Denver, out of 3,287 buildings citywide. Walsh Annex's ENERGY STAR score of 75 compares with an average of 78 across the 956 that report a score; it scores higher than 32% of them and lower than 66%. Its site EUI of 63.5 kBtu/ft² is about 11% above the average of 57.0 kBtu/ft² — it uses more energy per square foot than the typical building in that group.
At 68,706 sq ft, it is about half of the average floor area of 126,139 sq ft for those buildings. It was built in 1971, 19 years earlier than the group's average year built (1990). 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 Walsh Annex's energy performance changed over time?
BuildingCensus holds 3 Denver disclosures for Walsh Annex, covering report years 2021–2023. Its ENERGY STAR score went from 79 in 2021 to 75 in 2023 (-4 points); its best year on file was 2022, at 83. Site EUI moved from 61.3 kBtu/ft² (2021) to 63.5 kBtu/ft² (2023), an 4% increase. Reported emissions went from 433 tCO₂e to 422 tCO₂e over the same span (down 2%).
What does an ENERGY STAR score of 75 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 75 means the building performs better than about 75% of its national peers. BuildingCensus bands the score into report-card grades; 75 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 Denver, 54% 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. Walsh Annex's 63.5 kBtu/ft² across 68,706 sq ft works out to about 4.4 billion Btu (1,279 MWh-equivalent) in 2023. The disclosure also reports 557,902 kWh of electricity and 23,961 therms of natural gas for the year.
Which law requires Walsh Annex to report its energy use?
Walsh Annex reports under the Energize Denver Building Performance Policy, the legal basis of Denver's Energize Denver Benchmarking program, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2023 disclosure (source record denver:5249:2023). Energize Denver sets energy-use (EUI) targets for buildings of 25,000+ sq ft — for most buildings an interim target in 2028 and a final target in 2032 — with civil penalties of roughly $0.15–0.35 per kBtu over target for non-compliance.
More multifamily housing buildings in Denver
- 2608 N Syracuse St· 68,502 sq ft
- Barney Ford· 68,240 sq ft · score 47 (D)
- Kensington Apartments· 68,149 sq ft · score 86 (A)
- Atlantis Apartments Ii - 420 W. Cedar Ave., Denver, Co· 68,029 sq ft · score 82 (B)
- 1898 S Bannock St· 67,919 sq ft
- Trivium Apartments· 67,800 sq ft · score 65 (C)
- Multifamily Housing buildings in Denver· 1,108 benchmarked
- All Denver benchmarked buildings· Energize Denver Building Performance Policy
- Most efficient large buildings in Denver
- Least efficient large buildings in Denver
- Biggest emitters in Denver
Frequently asked questions
What is Walsh Annex's energy grade?
Walsh Annex scores 75 out of 100 on ENERGY STAR — band B, above median (70–84) — in its 2023 Denver disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Walsh Annex use?
Its 2023 site energy-use intensity was 63.5 kBtu/ft² across 68,706 sq ft, including 557,902 kWh of electricity and 23,961 therms of natural gas.
What are Walsh Annex's carbon emissions?
Walsh Annex reported 422 tCO₂e of greenhouse-gas emissions for 2023.
Where is Walsh Annex?
Walsh Annex is at 1775 W. Mosier Pl, in Denver, Colorado 80223.
How big is Walsh Annex and when was it built?
Walsh Annex has 68,706 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 1971 as its year built. It is classed as multifamily housing.
Is Walsh Annex covered by the Energize Denver Building Performance Policy?
Yes — it appears in the 2023 Energize Denver Benchmarking disclosure, which lists the buildings reporting under the Energize Denver Building Performance Policy.
Working with Denver building benchmarking records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
About this data
Source: Energize Denver Benchmarking (Energize Denver Building Performance Policy), as published July 9, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “Walsh Annex, Denver, Colorado — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/denver/walsh-annex-ae41cea6 (data as of July 9, 2026).