Knoll Realty - 1801 50 st
Multifamily Housing in New York City, NY · 1801 50 st · 11204
At a glance
Knoll Realty - 1801 50 st is a 31,200-square-foot multifamily housing building in New York City, New York, built in 1925. In its 2023 New York City benchmarking disclosure it reported an ENERGY STAR score of 2 out of 100 (grade D), a site energy-use intensity of 118.5 kBtu/ft² and 252 tCO₂e of greenhouse-gas emissions. That score is higher than 3% of the 22,829 scored multifamily housing buildings in New York City.
Local Law 84 (LL84) · reporting year 2023
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 2 (band D) |
| Site EUI | 118.5 kBtu/ft² |
| Source EUI | 180.2 kBtu/ft² |
| GHG emissions | 252 tCO₂e |
| GHG intensity | 8.1 kgCO₂e/ft² |
| Electricity | 291,652 kWh |
| Natural gas | 27,010 therms |
| Water use | 4,737 kgal |
| Gross floor area | 31,200 sq ft |
| Source record | nyc:6589567:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 2 | ±0 | 118.5 kBtu/ft² | 252 tCO₂e |
| 2022 | 2 | 133.5 kBtu/ft² | 253 tCO₂e |
Compliance context
Local Law 84 (LL84)
Under Local Law 97, buildings over 25,000 sq ft face carbon caps with fines of $268 per metric ton of CO₂e over the limit, phasing in from 2024.
Ownership
No owning organisation shown. Names of private individuals in the disclosure are not published here.
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Location
- Address
- 1801 50 st
- City
- New York City
- State
- New York
- ZIP
- 11204
- Coordinates
- 40.62761, -73.98134
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does Knoll Realty - 1801 50 st compare with other multifamily housing buildings in New York City?
The latest disclosures cover 33,022 multifamily housing buildings in New York City, out of 48,310 buildings citywide. Knoll Realty - 1801 50 st's ENERGY STAR score of 2 compares with an average of 63 across the 22,829 that report a score; it scores higher than 3% of them and lower than 97%. Its site EUI of 118.5 kBtu/ft² is about 58% above the average of 74.9 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 8.1 kgCO₂e/ft² is about 56% above the group average of 5.2 kgCO₂e/ft².
At 31,200 sq ft, it is about 69% below the average floor area of 100,951 sq ft for those buildings. It was built in 1925, 27 years earlier than the group's average year built (1952). 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 Knoll Realty - 1801 50 st's energy performance changed over time?
BuildingCensus holds 2 New York City disclosures for Knoll Realty - 1801 50 st, covering report years 2022–2023. Its ENERGY STAR score was 2 in both 2022 and 2023. Site EUI moved from 133.5 kBtu/ft² (2022) to 118.5 kBtu/ft² (2023), a 11% decrease. Reported emissions went from 253 tCO₂e to 252 tCO₂e over the same span (down 0%).
What does an ENERGY STAR score of 2 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 2 means the building performs better than about 2% of its national peers. BuildingCensus bands the score into report-card grades; 2 falls in band D — lowest band (1–54). It sits 73 points below 75, the threshold for ENERGY STAR certification. In New York City, 43% 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. Knoll Realty - 1801 50 st's 118.5 kBtu/ft² across 31,200 sq ft works out to about 3.7 billion Btu (1,084 MWh-equivalent) in 2023. Its source EUI of 180.2 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 291,652 kWh of electricity, 27,010 therms of natural gas and 4,737 thousand gallons of water for the year.
Which law requires Knoll Realty - 1801 50 st to report its energy use?
Knoll Realty - 1801 50 st reports under Local Law 84 (LL84), the legal basis of New York City's Energy and Water Data Disclosure program, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2023 disclosure (source record nyc:6589567:2023). Under Local Law 97, buildings over 25,000 sq ft face carbon caps with fines of $268 per metric ton of CO₂e over the limit, phasing in from 2024.
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Frequently asked questions
What is Knoll Realty - 1801 50 st's energy grade?
Knoll Realty - 1801 50 st scores 2 out of 100 on ENERGY STAR — band D, lowest band (1–54) — in its 2023 New York City disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Knoll Realty - 1801 50 st use?
Its 2023 site energy-use intensity was 118.5 kBtu/ft² (180.2 kBtu/ft² source) across 31,200 sq ft, including 291,652 kWh of electricity and 27,010 therms of natural gas.
What are Knoll Realty - 1801 50 st's carbon emissions?
Knoll Realty - 1801 50 st reported 252 tCO₂e of greenhouse-gas emissions (8.1 kgCO₂e/ft²) for 2023.
Where is Knoll Realty - 1801 50 st?
Knoll Realty - 1801 50 st is in New York City, New York 11204. Its coordinates are 40.62761, -73.98134 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is Knoll Realty - 1801 50 st and when was it built?
Knoll Realty - 1801 50 st has 31,200 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 1925 as its year built. It is classed as multifamily housing.
Is Knoll Realty - 1801 50 st covered by Local Law 84 (LL84)?
Yes — it appears in the 2023 Energy and Water Data Disclosure disclosure, which lists the buildings reporting under Local Law 84 (LL84).
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About this data
Source: Energy and Water Data Disclosure (Local Law 84 (LL84)), as published October 2, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “Knoll Realty - 1801 50 st, New York City, New York — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/knoll-realty-1801-50-st-1c800bff (data as of October 2, 2026).