(PA2418) - Ayer Condominium (210 W. Washington Square)
Multifamily Housing in Philadelphia, PA · 210 W. Washington Square · 19106
At a glance
(PA2418) - Ayer Condominium (210 W. Washington Square) is a 3,401-square-foot multifamily housing building in Philadelphia, Pennsylvania, built in 1929. In its 2024 Philadelphia benchmarking disclosure it reported an ENERGY STAR score of 1 out of 100 (grade D), a site energy-use intensity of 120.6 kBtu/ft² and 1,073 tCO₂e of greenhouse-gas emissions.
Some figures below are far outside what a multifamily housingof this size can use or emit — most likely a unit or entry error in the city's file. They are shown exactly as published and are left out of rankings and averages.
Phila. Code §9-3402 / Building Energy Performance Program · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 1 (band D) |
| Site EUI | 120.6 kBtu/ft² |
| Source EUI | 232.8 kBtu/ft² |
| GHG emissions | 1,073 tCO₂e |
| GHG intensity | — |
| Electricity | 2,243,907 kWh |
| Natural gas | 75,542 therms |
| Water use | 7,470 kgal |
| Gross floor area | 3,401 sq ft |
| Source record | philadelphia:4926791:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 1 | ±0 | 120.6 kBtu/ft² | 1,073 tCO₂e |
| 2023 | 1 | ±0 | 115.9 kBtu/ft² | 1,034 tCO₂e |
| 2022 | 1 | ±0 | 124.1 kBtu/ft² | 1,074 tCO₂e |
| 2021 | 1 | ±0 | 125.2 kBtu/ft² | 1,105 tCO₂e |
| 2020 | 1 | ±0 | 124.1 kBtu/ft² | 1,037 tCO₂e |
| 2019 | 1 | 153.9 kBtu/ft² | 1,284 tCO₂e |
Compliance context
Phila. Code §9-3402 / Building Energy Performance Program
Philadelphia requires commercial and multifamily buildings of 50,000+ sq ft to benchmark annually; its Building Energy Performance Program additionally requires non-residential buildings of 50,000+ sq ft to complete a tune-up or certify as high-performance every five years, with fines starting at $2,000 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
- 210 W. Washington Square
- City
- Philadelphia
- State
- Pennsylvania
- ZIP
- 19106
- Coordinates
- 39.94726, -75.15365
Within ~1 km
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See also: most efficient in Philadelphia · biggest emitters
How has (PA2418) - Ayer Condominium (210 W. Washington Square)'s energy performance changed over time?
BuildingCensus holds 6 Philadelphia disclosures for (PA2418) - Ayer Condominium (210 W. Washington Square), covering report years 2019–2024. Its ENERGY STAR score was 1 in both 2019 and 2024. Site EUI moved from 153.9 kBtu/ft² (2019) to 115.9 kBtu/ft² (2023), a 25% decrease. Reported emissions went from 1,284 tCO₂e to 1,034 tCO₂e over the same span (down 19%).
What does an ENERGY STAR score of 1 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: 1 is the bottom of the scale. BuildingCensus bands the score into report-card grades; 1 falls in band D — lowest band (1–54). It sits 74 points below 75, the threshold for ENERGY STAR certification. In Philadelphia, 35% of scored buildings are at 75 or above.
Which law requires (PA2418) - Ayer Condominium (210 W. Washington Square) to report its energy use?
(PA2418) - Ayer Condominium (210 W. Washington Square) reports under Phila. Code §9-3402 / Building Energy Performance Program, the legal basis of Philadelphia's Building Energy Benchmarking program, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2024 disclosure (source record philadelphia:4926791:2024). Philadelphia requires commercial and multifamily buildings of 50,000+ sq ft to benchmark annually; its Building Energy Performance Program additionally requires non-residential buildings of 50,000+ sq ft to complete a tune-up or certify as high-performance every five years, with fines starting at $2,000 for non-compliance.
More multifamily housing buildings in Philadelphia
- 1820 Rittenhouse Square· 3,217 sq ft
- (PA2632) - One Riverside Condo (210 S 25th St)· 3,205 sq ft · score 8 (D)
- 10 Rittenhouse Square· 2,560 sq ft · score 21 (D)
- (PA2407) - Old City 108 Condominiums (108 Arch St.)· 2,556 sq ft · score 46 (D)
- 227-31 South 6th Street· 2,306 sq ft
- 2100 Hamilton· 2,125 sq ft · score 2 (D)
- Multifamily Housing buildings in Philadelphia· 768 benchmarked
- All Philadelphia benchmarked buildings· Phila. Code §9-3402 / Building Energy Performance Program
- Most efficient large buildings in Philadelphia
- Least efficient large buildings in Philadelphia
- Biggest emitters in Philadelphia
Frequently asked questions
What is (PA2418) - Ayer Condominium (210 W. Washington Square)'s energy grade?
(PA2418) - Ayer Condominium (210 W. Washington Square) scores 1 out of 100 on ENERGY STAR — band D, lowest band (1–54) — in its 2024 Philadelphia disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does (PA2418) - Ayer Condominium (210 W. Washington Square) use?
Its 2024 site energy-use intensity was 120.6 kBtu/ft² (232.8 kBtu/ft² source) across 3,401 sq ft, including 2,243,907 kWh of electricity and 75,542 therms of natural gas.
What are (PA2418) - Ayer Condominium (210 W. Washington Square)'s carbon emissions?
(PA2418) - Ayer Condominium (210 W. Washington Square) reported 1,073 tCO₂e of greenhouse-gas emissions for 2024.
Where is (PA2418) - Ayer Condominium (210 W. Washington Square)?
(PA2418) - Ayer Condominium (210 W. Washington Square) is in Philadelphia, Pennsylvania 19106. Its coordinates are 39.94726, -75.15365 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is (PA2418) - Ayer Condominium (210 W. Washington Square) and when was it built?
(PA2418) - Ayer Condominium (210 W. Washington Square) has 3,401 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1929 as its year built. It is classed as multifamily housing.
Is (PA2418) - Ayer Condominium (210 W. Washington Square) covered by Phila. Code §9-3402 / Building Energy Performance Program?
Yes — it appears in the 2024 Building Energy Benchmarking disclosure, which lists the buildings reporting under Phila. Code §9-3402 / Building Energy Performance Program.
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About this data
Source: Building Energy Benchmarking (Phila. Code §9-3402 / Building Energy Performance Program), as published July 9, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “(PA2418) - Ayer Condominium (210 W. Washington Square), Philadelphia, Pennsylvania — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/philadelphia/pa2418-ayer-condominium-210-w-washington-square-114390a5 (data as of July 9, 2026).