Waterstone Apartments

How does Waterstone Apartments compare with other multifamily housing buildings in California?

The latest disclosures cover 10,630 multifamily housing buildings in California, out of 40,029 buildings citywide. Waterstone Apartments's ENERGY STAR score of 79 compares with an average of 82 across the 9,612 that report a score; it scores higher than 31% of them and lower than 68%. Its site EUI of 45.6 kBtu/ft² is about 33% above the average of 34.4 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 2.7 kgCO₂e/ft² is about 30% above the group average of 2.1 kgCO₂e/ft².

At 152,919 sq ft, it is roughly in line with the average floor area of 150,919 sq ft for those buildings. It was built in 2007, 19 years later than the group's average year built (1988). 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 Waterstone Apartments's energy performance changed over time?

BuildingCensus holds 3 California disclosures for Waterstone Apartments, covering report years 2022–2024. Its ENERGY STAR score went from 69 in 2022 to 79 in 2024 (+10 points); its best year on file was 2023, at 80. Site EUI moved from 46.9 kBtu/ft² (2022) to 45.6 kBtu/ft² (2024), a 3% decrease. Reported emissions went from 437 tCO₂e to 416 tCO₂e over the same span (down 5%).

What does an ENERGY STAR score of 79 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 79 means the building performs better than about 79% of its national peers. BuildingCensus bands the score into report-card grades; 79 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 California, 65% 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. Waterstone Apartments's 45.6 kBtu/ft² across 152,919 sq ft works out to about 7 billion Btu (2,044 MWh-equivalent) in 2024. The disclosure also reports 939,773 kWh of electricity and 38,163 therms of natural gas for the year.

Which law requires Waterstone Apartments to report its energy use?

Waterstone Apartments reports under AB 802 (Public Resources Code §25402.10), the legal basis of California's Building Energy Benchmarking Program (statewide), which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2024 disclosure (source record california:5003588:2024). AB 802 requires every California commercial building over 50,000 sq ft to report energy use to the CEC annually; the CEC publicly discloses the results statewide.