Mansard Square: 3080 West Iliff Avenue
Multifamily Housing in Denver, CO · 3080 West Iliff Avenue · 80219
At a glance
Mansard Square: 3080 West Iliff Avenue is a 25,350-square-foot multifamily housing building in Denver, Colorado, built in 1983. In its 2023 Denver benchmarking disclosure it reported an ENERGY STAR score of 84 out of 100 (grade B), a site energy-use intensity of 53.6 kBtu/ft² and 138 tCO₂e of greenhouse-gas emissions. That score is higher than 47% of the 956 scored multifamily housing buildings in Denver.
Energize Denver Building Performance Policy · reporting year 2023
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 84 (band B) |
| Site EUI | 53.6 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 138 tCO₂e |
| GHG intensity | — |
| Electricity | 199,607 kWh |
| Natural gas | 6,776 therms |
| Gross floor area | 25,350 sq ft |
| Source record | denver:3862:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 84 | ±0 | 53.6 kBtu/ft² | 138 tCO₂e |
| 2022 | 84 | -8 | 55.6 kBtu/ft² | 146 tCO₂e |
| 2021 | 92 | 50.7 kBtu/ft² | 132 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
- 3080 West Iliff Avenue
- City
- Denver
- State
- Colorado
- ZIP
- 80219
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 Mansard Square: 3080 West Iliff Avenue 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. Mansard Square: 3080 West Iliff Avenue's ENERGY STAR score of 84 compares with an average of 78 across the 956 that report a score; it scores higher than 47% of them and lower than 51%. Its site EUI of 53.6 kBtu/ft² is roughly in line with the average of 57.0 kBtu/ft² — it uses less energy per square foot than the typical building in that group.
At 25,350 sq ft, it is about 80% below the average floor area of 126,139 sq ft for those buildings. It was built in 1983, 7 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 Mansard Square: 3080 West Iliff Avenue's energy performance changed over time?
BuildingCensus holds 3 Denver disclosures for Mansard Square: 3080 West Iliff Avenue, covering report years 2021–2023. Its ENERGY STAR score went from 92 in 2021 to 84 in 2023 (-8 points); its best year on file was 2021, at 92. Site EUI moved from 50.7 kBtu/ft² (2021) to 53.6 kBtu/ft² (2023), an 6% increase. Reported emissions went from 132 tCO₂e to 138 tCO₂e over the same span (up 5%).
What does an ENERGY STAR score of 84 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 84 means the building performs better than about 84% of its national peers. BuildingCensus bands the score into report-card grades; 84 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. Mansard Square: 3080 West Iliff Avenue's 53.6 kBtu/ft² across 25,350 sq ft works out to about 1.4 billion Btu (398 MWh-equivalent) in 2023. The disclosure also reports 199,607 kWh of electricity and 6,776 therms of natural gas for the year.
Which law requires Mansard Square: 3080 West Iliff Avenue to report its energy use?
Mansard Square: 3080 West Iliff Avenue 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:3862:2023). 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
- Legacy At City Park Condo Association, Inc.· 25,314 sq ft · score 83 (B)
- Grayson Place At 3Rd Avenue· 25,200 sq ft · EUI 33.4 kBtu/ft²
- Building 1, 5255 Memphis St· 25,180 sq ft · score 93 (A)
- Building 7, 5255 N Memphis St· 25,180 sq ft · score 95 (A)
- Building 8, 5255 N Memphis St· 25,180 sq ft · score 77 (B)
- Building 9, 5255 N Memphis St· 25,180 sq ft · score 84 (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 Mansard Square: 3080 West Iliff Avenue's energy grade?
Mansard Square: 3080 West Iliff Avenue scores 84 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 Mansard Square: 3080 West Iliff Avenue use?
Its 2023 site energy-use intensity was 53.6 kBtu/ft² across 25,350 sq ft, including 199,607 kWh of electricity and 6,776 therms of natural gas.
What are Mansard Square: 3080 West Iliff Avenue's carbon emissions?
Mansard Square: 3080 West Iliff Avenue reported 138 tCO₂e of greenhouse-gas emissions for 2023.
Where is Mansard Square: 3080 West Iliff Avenue?
Mansard Square: 3080 West Iliff Avenue is in Denver, Colorado 80219.
How big is Mansard Square: 3080 West Iliff Avenue and when was it built?
Mansard Square: 3080 West Iliff Avenue has 25,350 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 1983 as its year built. It is classed as multifamily housing.
Is Mansard Square: 3080 West Iliff Avenue 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, “Mansard Square: 3080 West Iliff Avenue, Denver, Colorado — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/denver/mansard-square-3080-west-iliff-avenue-b9d0fdd4 (data as of July 9, 2026).