Knowlton Condo
Multifamily Housing in Washington, DC, DC · 2227 20th St NW · 20009
At a glance
Knowlton Condo is a 39,785-square-foot multifamily housing building at 2227 20th St NW in Washington, DC, built in 1923. In its 2024 Washington, DC benchmarking disclosure it reported an ENERGY STAR score of 97 out of 100 (grade A), a site energy-use intensity of 44.1 kBtu/ft² and 109 tCO₂e of greenhouse-gas emissions. That score is higher than 87% of the 1,618 scored multifamily housing buildings in Washington, DC.
Clean and Affordable Energy Act / BEPS · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 97 (band A) |
| Site EUI | 44.1 kBtu/ft² |
| Source EUI | 66.6 kBtu/ft² |
| GHG emissions | 109 tCO₂e |
| GHG intensity | 2.7 kgCO₂e/ft² |
| Electricity | 135,000 kWh |
| Natural gas | 12,938 therms |
| Water use | 1,205 kgal |
| Gross floor area | 39,785 sq ft |
| Source record | dc:PM19579503:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 97 | -1 | 44.1 kBtu/ft² | 109 tCO₂e |
| 2023 | 98 | +1 | 42.9 kBtu/ft² | 106 tCO₂e |
| 2022 | 97 | 49.6 kBtu/ft² | 118 tCO₂e |
Compliance context
Clean and Affordable Energy Act / BEPS
DC's Building Energy Performance Standards (BEPS) require buildings below the performance standard to improve over compliance cycles (the first ends December 31, 2026; later cycles run five years), with penalties for buildings that fail to meet their pathway.
Ownership
THE KNOWLTON CONDOMINIUM
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Location
- Address
- 2227 20th St NW
- City
- Washington, DC
- State
- District of Columbia
- ZIP
- 20009
- Coordinates
- 38.91900, -77.04585
Within ~1 km
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How does Knowlton Condo compare with other multifamily housing buildings in Washington, DC?
The latest disclosures cover 1,799 multifamily housing buildings in Washington, DC, out of 6,870 buildings citywide. Knowlton Condo's ENERGY STAR score of 97 compares with an average of 72 across the 1,618 that report a score; it scores higher than 87% of them and lower than 10%. Its site EUI of 44.1 kBtu/ft² is about 14% below the average of 51.1 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 2.7 kgCO₂e/ft² is about 28% below the group average of 3.8 kgCO₂e/ft².
At 39,785 sq ft, it is about 71% below the average floor area of 136,346 sq ft for those buildings. It was built in 1923, 42 years earlier than the group's average year built (1965). 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 Knowlton Condo's energy performance changed over time?
BuildingCensus holds 3 Washington, DC disclosures for Knowlton Condo, covering report years 2022–2024. Its ENERGY STAR score was 97 in both 2022 and 2024. Site EUI moved from 49.6 kBtu/ft² (2022) to 44.1 kBtu/ft² (2024), a 11% decrease. Reported emissions went from 118 tCO₂e to 109 tCO₂e over the same span (down 8%).
What does an ENERGY STAR score of 97 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 97 means the building performs better than about 97% of its national peers. BuildingCensus bands the score into report-card grades; 97 falls in band A — high performer (85–100). 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 Washington, DC, 47% 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. Knowlton Condo's 44.1 kBtu/ft² across 39,785 sq ft works out to about 1.8 billion Btu (514 MWh-equivalent) in 2024. Its source EUI of 66.6 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 135,000 kWh of electricity, 12,938 therms of natural gas and 1,205 thousand gallons of water for the year.
Which law requires Knowlton Condo to report its energy use?
Knowlton Condo reports under the Clean and Affordable Energy Act / BEPS, the legal basis of Washington, DC'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 dc:PM19579503:2024). DC's Building Energy Performance Standards (BEPS) require buildings below the performance standard to improve over compliance cycles (the first ends December 31, 2026; later cycles run five years), with penalties for buildings that fail to meet their pathway.
More multifamily housing buildings in Washington, DC
- Chillum Manor - 2· 39,694 sq ft · score 56 (C)
- The Marvin Condominium· 39,673 sq ft · score 93 (A)
- Oak Terrace Condominium· 39,649 sq ft · score 89 (A)
- Robert L Walker House: Building A· 39,253 sq ft · score 27 (D)
- C· 39,231 sq ft · score 99 (A)
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- Multifamily Housing buildings in Washington, DC· 1,799 benchmarked
- All Washington, DC benchmarked buildings· Clean and Affordable Energy Act / BEPS
- Most efficient large buildings in Washington, DC
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- Biggest emitters in Washington, DC
Frequently asked questions
What is Knowlton Condo's energy grade?
Knowlton Condo scores 97 out of 100 on ENERGY STAR — band A, high performer (85–100) — in its 2024 Washington, DC disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Knowlton Condo use?
Its 2024 site energy-use intensity was 44.1 kBtu/ft² (66.6 kBtu/ft² source) across 39,785 sq ft, including 135,000 kWh of electricity and 12,938 therms of natural gas.
What are Knowlton Condo's carbon emissions?
Knowlton Condo reported 109 tCO₂e of greenhouse-gas emissions (2.7 kgCO₂e/ft²) for 2024.
Where is Knowlton Condo?
Knowlton Condo is at 2227 20th St NW, in Washington, DC 20009. Its coordinates are 38.91900, -77.04585 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Knowlton Condo and when was it built?
Knowlton Condo has 39,785 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1923 as its year built. It is classed as multifamily housing.
Is Knowlton Condo covered by the Clean and Affordable Energy Act / BEPS?
Yes — it appears in the 2024 Building Energy Benchmarking disclosure, which lists the buildings reporting under the Clean and Affordable Energy Act / BEPS.
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About this data
Source: Building Energy Benchmarking (Clean and Affordable Energy Act / BEPS), as published July 9, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “Knowlton Condo, Washington, DC — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/washington-dc/knowlton-condo-9919605d (data as of July 9, 2026).