BuildingCensus
C

Mclean Gardens - Mechanical Plant D

Multifamily Housing in Washington, DC, DC · 3943 Langley Ct · 20016

At a glance

Mclean Gardens - Mechanical Plant D is a 235,609-square-foot multifamily housing building at 3943 Langley Ct in Washington, DC, built in 1942. In its 2024 Washington, DC benchmarking disclosure it reported an ENERGY STAR score of 64 out of 100 (grade C), a site energy-use intensity of 32.9 kBtu/ft² and 569 tCO₂e of greenhouse-gas emissions. That score is higher than 31% of the 1,618 scored multifamily housing buildings in Washington, DC.

ENERGY STAR score
64
band C · 2024
Site EUI
32.9
kBtu/ft²
GHG emissions
569
tCO₂e
GHG intensity
2.4
kgCO₂e/ft²
Floor area
235,609
sq ft
Year built
1942
vintage
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85–10070–8455–691–54
This entry + 6 nearby

Clean and Affordable Energy Act / BEPS · reporting year 2024

Benchmarking record

FieldValue
ENERGY STAR score64 (band C)
Site EUI32.9 kBtu/ft²
Source EUI78.5 kBtu/ft²
GHG emissions569 tCO₂e
GHG intensity2.4 kgCO₂e/ft²
Electricity1,732,691 kWh
Natural gas18,453 therms
Water use5,138 kgal
Gross floor area235,609 sq ft
Source recorddc:PM34025537:2024

The disclosure history

Year over year

YearScoreΔSite EUIGHG emissions
2024latest64+632.9 kBtu/ft²569 tCO₂e
202358-1231.8 kBtu/ft²550 tCO₂e
202270+1234.7 kBtu/ft²644 tCO₂e
202158+234.1 kBtu/ft²658 tCO₂e
202056-833.8 kBtu/ft²637 tCO₂e
201964+536.1 kBtu/ft²702 tCO₂e
20185938.1 kBtu/ft²747 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.

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Ownership

MCLEAN GARDENS

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Location

Address
3943 Langley Ct
State
District of Columbia
ZIP
20016
Coordinates
38.93491, -77.07764

Within ~1 km

Nearby benchmarked buildings

See also: most efficient in Washington, DC · biggest emitters

How does Mclean Gardens - Mechanical Plant D 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. Mclean Gardens - Mechanical Plant D's ENERGY STAR score of 64 compares with an average of 72 across the 1,618 that report a score; it scores higher than 31% of them and lower than 68%. Its site EUI of 32.9 kBtu/ft² is about 36% 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 2.4 kgCO₂e/ft² is about 37% below the group average of 3.8 kgCO₂e/ft².

At 235,609 sq ft, it is about 73% above the average floor area of 136,346 sq ft for those buildings. It was built in 1942, 23 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 Mclean Gardens - Mechanical Plant D's energy performance changed over time?

BuildingCensus holds 7 Washington, DC disclosures for Mclean Gardens - Mechanical Plant D, covering report years 2018–2024. Its ENERGY STAR score went from 59 in 2018 to 64 in 2024 (+5 points); its best year on file was 2022, at 70. Site EUI moved from 38.1 kBtu/ft² (2018) to 32.9 kBtu/ft² (2024), a 14% decrease. Reported emissions went from 747 tCO₂e to 569 tCO₂e over the same span (down 24%).

What does an ENERGY STAR score of 64 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 64 means the building performs better than about 64% of its national peers. BuildingCensus bands the score into report-card grades; 64 falls in band C — below median (55–69). It sits 11 points below 75, the threshold for ENERGY STAR certification. 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. Mclean Gardens - Mechanical Plant D's 32.9 kBtu/ft² across 235,609 sq ft works out to about 7.8 billion Btu (2,272 MWh-equivalent) in 2024. Its source EUI of 78.5 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,732,691 kWh of electricity, 18,453 therms of natural gas and 5,138 thousand gallons of water for the year.

Which law requires Mclean Gardens - Mechanical Plant D to report its energy use?

Mclean Gardens - Mechanical Plant D 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:PM34025537:2024). 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

Frequently asked questions

What is Mclean Gardens - Mechanical Plant D's energy grade?

Mclean Gardens - Mechanical Plant D scores 64 out of 100 on ENERGY STAR — band C, below median (55–69) — in its 2024 Washington, DC disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.

How much energy does Mclean Gardens - Mechanical Plant D use?

Its 2024 site energy-use intensity was 32.9 kBtu/ft² (78.5 kBtu/ft² source) across 235,609 sq ft, including 1,732,691 kWh of electricity and 18,453 therms of natural gas.

What are Mclean Gardens - Mechanical Plant D's carbon emissions?

Mclean Gardens - Mechanical Plant D reported 569 tCO₂e of greenhouse-gas emissions (2.4 kgCO₂e/ft²) for 2024.

Where is Mclean Gardens - Mechanical Plant D?

Mclean Gardens - Mechanical Plant D is at 3943 Langley Ct, in Washington, DC 20016. Its coordinates are 38.93491, -77.07764 (latitude, longitude), as published in the Building Energy Benchmarking file.

How big is Mclean Gardens - Mechanical Plant D and when was it built?

Mclean Gardens - Mechanical Plant D has 235,609 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1942 as its year built. It is classed as multifamily housing.

Is Mclean Gardens - Mechanical Plant D 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, “Mclean Gardens - Mechanical Plant D, Washington, DC — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/washington-dc/mclean-gardens-mechanical-plant-d-6a5fac01 (data as of July 9, 2026).