Bldg 45 - 660 S. Alton Way
Multifamily Housing in Denver, CO · 660 S. Alton Way · 80247
At a glance
Bldg 45 - 660 S. Alton Way is a 61,030-square-foot multifamily housing building in Denver, Colorado, built in 1969. In its 2023 Denver benchmarking disclosure it reported an ENERGY STAR score of 98 out of 100 (grade A), a site energy-use intensity of 42.6 kBtu/ft² and 190 tCO₂e of greenhouse-gas emissions. That score is higher than 85% of the 956 scored multifamily housing buildings in Denver.
Energize Denver Building Performance Policy · reporting year 2023
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 98 (band A) |
| Site EUI | 42.6 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 190 tCO₂e |
| GHG intensity | — |
| Electricity | 147,367 kWh |
| Natural gas | 20,992 therms |
| Gross floor area | 61,030 sq ft |
| Source record | denver:5773:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 98 | -1 | 42.6 kBtu/ft² | 190 tCO₂e |
| 2022 | 99 | ±0 | 42.8 kBtu/ft² | 192 tCO₂e |
| 2021 | 99 | 41.4 kBtu/ft² | 192 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
- 660 S. Alton Way
- City
- Denver
- State
- Colorado
- ZIP
- 80247
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 Bldg 45 - 660 S. Alton Way 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. Bldg 45 - 660 S. Alton Way's ENERGY STAR score of 98 compares with an average of 78 across the 956 that report a score; it scores higher than 85% of them and lower than 10%. Its site EUI of 42.6 kBtu/ft² is about 25% below the average of 57.0 kBtu/ft² — it uses less energy per square foot than the typical building in that group.
At 61,030 sq ft, it is about half of the average floor area of 126,139 sq ft for those buildings. It was built in 1969, 21 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 Bldg 45 - 660 S. Alton Way's energy performance changed over time?
BuildingCensus holds 3 Denver disclosures for Bldg 45 - 660 S. Alton Way, covering report years 2021–2023. Its ENERGY STAR score went from 99 in 2021 to 98 in 2023 (-1 points); its best year on file was 2021, at 99. Site EUI moved from 41.4 kBtu/ft² (2021) to 42.6 kBtu/ft² (2023), an 3% increase. Reported emissions went from 192 tCO₂e to 190 tCO₂e over the same span (down 1%).
What does an ENERGY STAR score of 98 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 98 means the building performs better than about 98% of its national peers. BuildingCensus bands the score into report-card grades; 98 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 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. Bldg 45 - 660 S. Alton Way's 42.6 kBtu/ft² across 61,030 sq ft works out to about 2.6 billion Btu (762 MWh-equivalent) in 2023. The disclosure also reports 147,367 kWh of electricity and 20,992 therms of natural gas for the year.
Which law requires Bldg 45 - 660 S. Alton Way to report its energy use?
Bldg 45 - 660 S. Alton Way 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:5773:2023). 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
- Shoshone· 60,871 sq ft · score 88 (A)
- Monaco South: 2280 S. Monaco Pkwy· 60,579 sq ft · score 98 (A)
- Bstreet· 60,499 sq ft
- 1616 South Broadway· 60,367 sq ft · score 79 (B)
- Grosvenor Arms: 333 East 16Th· 60,000 sq ft · score 35 (D)
- Waldman Condominiums· 60,000 sq ft · score 81 (B)
- 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 Bldg 45 - 660 S. Alton Way's energy grade?
Bldg 45 - 660 S. Alton Way scores 98 out of 100 on ENERGY STAR — band A, high performer (85–100) — in its 2023 Denver disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Bldg 45 - 660 S. Alton Way use?
Its 2023 site energy-use intensity was 42.6 kBtu/ft² across 61,030 sq ft, including 147,367 kWh of electricity and 20,992 therms of natural gas.
What are Bldg 45 - 660 S. Alton Way's carbon emissions?
Bldg 45 - 660 S. Alton Way reported 190 tCO₂e of greenhouse-gas emissions for 2023.
Where is Bldg 45 - 660 S. Alton Way?
Bldg 45 - 660 S. Alton Way is in Denver, Colorado 80247.
How big is Bldg 45 - 660 S. Alton Way and when was it built?
Bldg 45 - 660 S. Alton Way has 61,030 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 1969 as its year built. It is classed as multifamily housing.
Is Bldg 45 - 660 S. Alton Way 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, “Bldg 45 - 660 S. Alton Way, Denver, Colorado — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/denver/bldg-45-660-s-alton-way-488fae8b (data as of July 9, 2026).