Westchester Rockville Station - 29809
Multifamily Housing in Montgomery County, MD · 100 First St · 20851
At a glance
Westchester Rockville Station - 29809 is a 274,513-square-foot multifamily housing building at 100 First St in Montgomery County, Maryland, built in 2009. In its 2024 Montgomery County benchmarking disclosure it reported an ENERGY STAR score of 85 out of 100 (grade A), a site energy-use intensity of 27.8 kBtu/ft² and 670 tCO₂e of greenhouse-gas emissions. That score is higher than 44% of the 514 scored multifamily housing buildings in Montgomery County.
Benchmarking Law (Bill 2-14) / BEPS (Bill 16-21) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 85 (band A) |
| Site EUI | 27.8 kBtu/ft² |
| Source EUI | 77.8 kBtu/ft² |
| GHG emissions | 670 tCO₂e |
| GHG intensity | — |
| Electricity | 2,236,438 kWh |
| Natural gas | 0 therms |
| Gross floor area | 274,513 sq ft |
| Source record | montgomery_county:14285925:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 85 | +7 | 27.8 kBtu/ft² | 670 tCO₂e |
| 2023 | 78 | 27.7 kBtu/ft² | 683 tCO₂e |
Compliance context
Benchmarking Law (Bill 2-14) / BEPS (Bill 16-21)
Montgomery County's BEPS (Bill 16-21; regulations approved in 2025) sets declining site-EUI standards for buildings of 25,000+ sq ft, with interim and then final standards later this decade and into the 2030s depending on building type.
Ownership
No owning organisation shown. Names of private individuals in the disclosure are not published here.
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Location
- Address
- 100 First St
- State
- Maryland
- ZIP
- 20851
Within ~1 km
Nearby benchmarked buildings
This source publishes no coordinates, so nearby buildings can't be resolved yet.
See also: most efficient in Montgomery County · biggest emitters
How does Westchester Rockville Station - 29809 compare with other multifamily housing buildings in Montgomery County?
The latest disclosures cover 553 multifamily housing buildings in Montgomery County, out of 1,766 buildings citywide. Westchester Rockville Station - 29809's ENERGY STAR score of 85 compares with an average of 80 across the 514 that report a score; it scores higher than 44% of them and lower than 54%. Its site EUI of 27.8 kBtu/ft² is about 36% below the average of 43.2 kBtu/ft² — it uses less energy per square foot than the typical building in that group.
At 274,513 sq ft, it is about 38% above the average floor area of 198,668 sq ft for those buildings. It was built in 2009, 20 years later than the group's average year built (1989). 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 Westchester Rockville Station - 29809's energy performance changed over time?
BuildingCensus holds 2 Montgomery County disclosures for Westchester Rockville Station - 29809, covering report years 2023–2024. Its ENERGY STAR score went from 78 in 2023 to 85 in 2024 (+7 points). Site EUI moved from 27.7 kBtu/ft² (2023) to 27.8 kBtu/ft² (2024), an 0% increase. Reported emissions went from 683 tCO₂e to 670 tCO₂e over the same span (down 2%).
What does an ENERGY STAR score of 85 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 85 means the building performs better than about 85% of its national peers. BuildingCensus bands the score into report-card grades; 85 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 Montgomery County, 53% 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. Westchester Rockville Station - 29809's 27.8 kBtu/ft² across 274,513 sq ft works out to about 7.6 billion Btu (2,237 MWh-equivalent) in 2024. Its source EUI of 77.8 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 2,236,438 kWh of electricity and 0 therms of natural gas for the year.
Which law requires Westchester Rockville Station - 29809 to report its energy use?
Westchester Rockville Station - 29809 reports under the Benchmarking Law (Bill 2-14) / BEPS (Bill 16-21), the legal basis of Montgomery County's Commercial 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 montgomery_county:14285925:2024). Montgomery County's BEPS (Bill 16-21; regulations approved in 2025) sets declining site-EUI standards for buildings of 25,000+ sq ft, with interim and then final standards later this decade and into the 2030s depending on building type.
More multifamily housing buildings in Montgomery County
- The Carleton At Chevy Chase· 273,951 sq ft · score 98 (A)
- Palladian Condominiums· 273,192 sq ft · score 78 (B)
- Camden Fallsgrove· 272,032 sq ft · score 86 (A)
- Atelier (Glenmont Metrocenter)· 268,024 sq ft
- Wayne Manchester Towers· 265,224 sq ft · score 80 (B)
- Grosvenor Park Iv· 263,796 sq ft · score 80 (B)
- Multifamily Housing buildings in Montgomery County· 553 benchmarked
- All Montgomery County benchmarked buildings· Benchmarking Law (Bill 2-14) / BEPS (Bill 16-21)
- Most efficient large buildings in Montgomery County
- Least efficient large buildings in Montgomery County
- Biggest emitters in Montgomery County
Frequently asked questions
What is Westchester Rockville Station - 29809's energy grade?
Westchester Rockville Station - 29809 scores 85 out of 100 on ENERGY STAR — band A, high performer (85–100) — in its 2024 Montgomery County disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Westchester Rockville Station - 29809 use?
Its 2024 site energy-use intensity was 27.8 kBtu/ft² (77.8 kBtu/ft² source) across 274,513 sq ft, including 2,236,438 kWh of electricity and 0 therms of natural gas.
What are Westchester Rockville Station - 29809's carbon emissions?
Westchester Rockville Station - 29809 reported 670 tCO₂e of greenhouse-gas emissions for 2024.
Where is Westchester Rockville Station - 29809?
Westchester Rockville Station - 29809 is at 100 First St, in Montgomery County, Maryland 20851.
How big is Westchester Rockville Station - 29809 and when was it built?
Westchester Rockville Station - 29809 has 274,513 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 2009 as its year built. It is classed as multifamily housing.
Is Westchester Rockville Station - 29809 covered by the Benchmarking Law (Bill 2-14) / BEPS (Bill 16-21)?
Yes — it appears in the 2024 Commercial Building Energy Benchmarking disclosure, which lists the buildings reporting under the Benchmarking Law (Bill 2-14) / BEPS (Bill 16-21).
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About this data
Source: Commercial Building Energy Benchmarking (Benchmarking Law (Bill 2-14) / BEPS (Bill 16-21)), as published October 2, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “Westchester Rockville Station - 29809, Montgomery County, Maryland — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/montgomery-county/westchester-rockville-station-29809-51a697d2 (data as of October 2, 2026).