The Aster Conservatory Green (East Phase)

How does The Aster Conservatory Green (East Phase) 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. The Aster Conservatory Green (East Phase)'s ENERGY STAR score of 43 compares with an average of 78 across the 956 that report a score; it scores higher than 10% of them and lower than 90%. Its site EUI of 73.2 kBtu/ft² is about 28% above the average of 57.0 kBtu/ft² — it uses more energy per square foot than the typical building in that group.

At 258,751 sq ft, it is about twice 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 The Aster Conservatory Green (East Phase)'s energy performance changed over time?

BuildingCensus holds 2 Denver disclosures for The Aster Conservatory Green (East Phase), covering report years 2022–2023. Its ENERGY STAR score went from 59 in 2022 to 43 in 2023 (-16 points); its best year on file was 2022, at 59. Site EUI moved from 71.2 kBtu/ft² (2022) to 73.2 kBtu/ft² (2023), an 3% increase. Reported emissions went from 1,516 tCO₂e to 1,625 tCO₂e over the same span (up 7%).

What does an ENERGY STAR score of 43 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 43 means the building performs better than about 43% of its national peers. BuildingCensus bands the score into report-card grades; 43 falls in band D — lowest band (1–54). It sits 32 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. The Aster Conservatory Green (East Phase)'s 73.2 kBtu/ft² across 258,751 sq ft works out to about 18.9 billion Btu (5,551 MWh-equivalent) in 2023. The disclosure also reports 1,778,840 kWh of electricity and 128,725 therms of natural gas for the year.

Which law requires The Aster Conservatory Green (East Phase) to report its energy use?

The Aster Conservatory Green (East Phase) 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:6337:2023). 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.