Mason On Mariposa
Multifamily Housing in California, CA · 1601 Mariposa Street, San Francisco · 94107
At a glance
Mason On Mariposa is a 126,000-square-foot multifamily housing building at 1601 Mariposa Street, San Francisco in San Francisco, California, built in 2019. In its 2024 California benchmarking disclosure it reported an ENERGY STAR score of 79 out of 100 (grade B), a site energy-use intensity of 53.4 kBtu/ft² and 404 tCO₂e of greenhouse-gas emissions. That score is higher than 31% of the 9,612 scored multifamily housing buildings in California.
AB 802 (Public Resources Code §25402.10) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 79 (band B) |
| Site EUI | 53.4 kBtu/ft² |
| Source EUI | — |
| GHG emissions | 404 tCO₂e |
| GHG intensity | 3.2 kgCO₂e/ft² |
| Electricity | 1,065,900 kWh |
| Natural gas | 30,691 therms |
| Gross floor area | 126,000 sq ft |
| Source record | california:20965552:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 79 | +3 | 53.4 kBtu/ft² | 404 tCO₂e |
| 2023 | 76 | +1 | 56.3 kBtu/ft² | 444 tCO₂e |
| 2022 | 75 | +35 | 59.2 kBtu/ft² | 451 tCO₂e |
| 2021 | 40 | 50.6 kBtu/ft² | 375 tCO₂e |
Compliance context
AB 802 (Public Resources Code §25402.10)
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.
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
- 1601 Mariposa Street, San Francisco
- City
- California
- State
- California
- ZIP
- 94107
- Coordinates
- 37.76357, -122.39990
Within ~1 km
Nearby benchmarked buildings
- The Exchangescore 52
Commercial · 1,057,149 sq ft
- 650 Townsend - Zyngascore 94
Commercial · 1,029,659 sq ft
- The Exchangescore 95
Office · 935,878 sq ft
- 650 Townsendscore 97
Office · 872,484 sq ft
- 1800 Owensscore 71
Office · 804,198 sq ft
- Genentech Hall & Campusscore —
College/University · 758,500 sq ft
See also: most efficient in California · biggest emitters
How does Mason On Mariposa 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. Mason On Mariposa'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 53.4 kBtu/ft² is about 55% 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 3.2 kgCO₂e/ft² is about 53% above the group average of 2.1 kgCO₂e/ft².
At 126,000 sq ft, it is about 17% below the average floor area of 150,919 sq ft for those buildings. It was built in 2019, 31 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 Mason On Mariposa's energy performance changed over time?
BuildingCensus holds 4 California disclosures for Mason On Mariposa, covering report years 2021–2024. Its ENERGY STAR score went from 40 in 2021 to 79 in 2024 (+39 points). Site EUI moved from 50.6 kBtu/ft² (2021) to 53.4 kBtu/ft² (2024), an 6% increase. Reported emissions went from 375 tCO₂e to 404 tCO₂e over the same span (up 8%).
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. Mason On Mariposa's 53.4 kBtu/ft² across 126,000 sq ft works out to about 6.7 billion Btu (1,972 MWh-equivalent) in 2024. The disclosure also reports 1,065,900 kWh of electricity and 30,691 therms of natural gas for the year.
Which law requires Mason On Mariposa to report its energy use?
Mason On Mariposa 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:20965552:2024). 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.
More multifamily housing buildings in California
- Mission Villa· 125,994 sq ft · score 100 (A)
- Greenback Manor· 125,981 sq ft · score 67 (C)
- Harvard Townhome Apartments· 125,928 sq ft · score 88 (A)
- Shadow Ridge Apartments· 125,922 sq ft · score 56 (C)
- Cambrian Center - Total· 125,899 sq ft · score 79 (B)
- Brandon Place Senior Apartments(Ba266)· 125,854 sq ft · EUI 38.7 kBtu/ft²
- Multifamily Housing buildings in California· 10,630 benchmarked
- All California benchmarked buildings· AB 802 (Public Resources Code §25402.10)
- Most efficient large buildings in California
- Least efficient large buildings in California
- Biggest emitters in California
Frequently asked questions
What is Mason On Mariposa's energy grade?
Mason On Mariposa scores 79 out of 100 on ENERGY STAR — band B, above median (70–84) — in its 2024 California disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Mason On Mariposa use?
Its 2024 site energy-use intensity was 53.4 kBtu/ft² across 126,000 sq ft, including 1,065,900 kWh of electricity and 30,691 therms of natural gas.
What are Mason On Mariposa's carbon emissions?
Mason On Mariposa reported 404 tCO₂e of greenhouse-gas emissions (3.2 kgCO₂e/ft²) for 2024.
Where is Mason On Mariposa?
Mason On Mariposa is at 1601 Mariposa Street, San Francisco, in San Francisco, California 94107. Its coordinates are 37.76357, -122.39990 (latitude, longitude), as published in the Building Energy Benchmarking Program (statewide) file.
How big is Mason On Mariposa and when was it built?
Mason On Mariposa has 126,000 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 2019 as its year built. It is classed as multifamily housing.
Is Mason On Mariposa covered by AB 802 (Public Resources Code §25402.10)?
Yes — it appears in the 2024 Building Energy Benchmarking Program (statewide) disclosure, which lists the buildings reporting under AB 802 (Public Resources Code §25402.10).
Working with California 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: Building Energy Benchmarking Program (statewide) (AB 802 (Public Resources Code §25402.10)), as published July 9, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “Mason On Mariposa, San Francisco, California — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/california/mason-on-mariposa-da57d748 (data as of July 9, 2026).