Arapahoe Square (Lx045)
Multifamily Housing in Denver, CO · 550 Park Ave W · 80205
At a glance
Arapahoe Square (Lx045) is a 350,652-square-foot multifamily housing building at 550 Park Ave W in Denver, Colorado, built in 2019. In its 2023 Denver benchmarking disclosure it reported an ENERGY STAR score of 64 out of 100 (grade C), a site energy-use intensity of 60.6 kBtu/ft² and 2,276 tCO₂e of greenhouse-gas emissions. That score is higher than 21% of the 956 scored multifamily housing buildings in Denver.
Energize Denver Building Performance Policy · reporting year 2023
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 64 (band C) |
| Site EUI | 60.6 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 2,276 tCO₂e |
| GHG intensity | — |
| Electricity | 3,299,188 kWh |
| Natural gas | 99,861 therms |
| Gross floor area | 350,652 sq ft |
| Source record | denver:5862:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 64 | -18 | 60.6 kBtu/ft² | 2,276 tCO₂e |
| 2022 | 82 | ±0 | 56.9 kBtu/ft² | 2,116 tCO₂e |
| 2021 | 82 | 55.4 kBtu/ft² | 2,208 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.
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Location
- Address
- 550 Park Ave W
- City
- Denver
- State
- Colorado
- ZIP
- 80205
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 Arapahoe Square (Lx045) 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. Arapahoe Square (Lx045)'s ENERGY STAR score of 64 compares with an average of 78 across the 956 that report a score; it scores higher than 21% of them and lower than 77%. Its site EUI of 60.6 kBtu/ft² is roughly in line with the average of 57.0 kBtu/ft².
At 350,652 sq ft, it is about 178% above the average floor area of 126,139 sq ft for those buildings. It was built in 2019, 29 years later 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 Arapahoe Square (Lx045)'s energy performance changed over time?
BuildingCensus holds 3 Denver disclosures for Arapahoe Square (Lx045), covering report years 2021–2023. Its ENERGY STAR score went from 82 in 2021 to 64 in 2023 (-18 points); its best year on file was 2021, at 82. Site EUI moved from 55.4 kBtu/ft² (2021) to 60.6 kBtu/ft² (2023), an 9% increase. Reported emissions went from 2,208 tCO₂e to 2,276 tCO₂e over the same span (up 3%).
What does an ENERGY STAR score of 64 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 64 means the building performs better than about 64% of its national peers. BuildingCensus bands the score into report-card grades; 64 falls in band C — below median (55–69). It sits 11 points below 75, the threshold for ENERGY STAR certification. 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. Arapahoe Square (Lx045)'s 60.6 kBtu/ft² across 350,652 sq ft works out to about 21.2 billion Btu (6,228 MWh-equivalent) in 2023. The disclosure also reports 3,299,188 kWh of electricity and 99,861 therms of natural gas for the year.
Which law requires Arapahoe Square (Lx045) to report its energy use?
Arapahoe Square (Lx045) 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:5862:2023). 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
- Barclay Towers - 1625 Larimer· 350,030 sq ft · score 98 (A)
- The Pullman (Pl208)· 349,598 sq ft · score 75 (B)
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- 955 Eudora St· 348,403 sq ft · score 90 (A)
- Green Valley Ranch (Gr323)· 346,698 sq ft · score 100 (A)
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- Multifamily Housing buildings in Denver· 1,108 benchmarked
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Frequently asked questions
What is Arapahoe Square (Lx045)'s energy grade?
Arapahoe Square (Lx045) scores 64 out of 100 on ENERGY STAR — band C, below median (55–69) — in its 2023 Denver disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Arapahoe Square (Lx045) use?
Its 2023 site energy-use intensity was 60.6 kBtu/ft² across 350,652 sq ft, including 3,299,188 kWh of electricity and 99,861 therms of natural gas.
What are Arapahoe Square (Lx045)'s carbon emissions?
Arapahoe Square (Lx045) reported 2,276 tCO₂e of greenhouse-gas emissions for 2023.
Where is Arapahoe Square (Lx045)?
Arapahoe Square (Lx045) is at 550 Park Ave W, in Denver, Colorado 80205.
How big is Arapahoe Square (Lx045) and when was it built?
Arapahoe Square (Lx045) has 350,652 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 2019 as its year built. It is classed as multifamily housing.
Is Arapahoe Square (Lx045) 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.
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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, “Arapahoe Square (Lx045), Denver, Colorado — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/denver/arapahoe-square-lx045-25740e9c (data as of July 9, 2026).