645 Water St
Multifamily Housing in New York City, NY · 645 Water Street · 10002
At a glance
645 Water St is a 125,750-square-foot multifamily housing building at 645 Water Street in New York City, New York, built in 1964. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 78 out of 100 (grade B), a site energy-use intensity of 42.0 kBtu/ft² and 540 tCO₂e of greenhouse-gas emissions. That score is higher than 61% of the 22,829 scored multifamily housing buildings in New York City.
Local Law 84 (LL84) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 78 (band B) |
| Site EUI | 42.0 kBtu/ft² |
| Source EUI | 102.4 kBtu/ft² |
| GHG emissions | 540 tCO₂e |
| GHG intensity | 4.3 kgCO₂e/ft² |
| Electricity | 1,227,715 kWh |
| Natural gas | 10,910 therms |
| Gross floor area | 125,750 sq ft |
| Source record | nyc:10397120:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 78 | +2 | 42.0 kBtu/ft² | 540 tCO₂e |
| 2023 | 76 | +5 | 42.6 kBtu/ft² | 518 tCO₂e |
| 2022 | 71 | 46.8 kBtu/ft² | 460 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
- 645 Water Street
- City
- New York City
- State
- New York
- ZIP
- 10002
- Coordinates
- 40.71138, -73.98265
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does 645 Water 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. 645 Water St's ENERGY STAR score of 78 compares with an average of 63 across the 22,829 that report a score; it scores higher than 61% of them and lower than 38%. Its site EUI of 42.0 kBtu/ft² is about 44% below the average of 74.9 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 4.3 kgCO₂e/ft² is about 18% below the group average of 5.2 kgCO₂e/ft².
At 125,750 sq ft, it is about 25% above the average floor area of 100,951 sq ft for those buildings. It was built in 1964, 12 years later 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 645 Water St's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for 645 Water St, covering report years 2022–2024. Its ENERGY STAR score went from 71 in 2022 to 78 in 2024 (+7 points). Site EUI moved from 46.8 kBtu/ft² (2022) to 42.0 kBtu/ft² (2024), a 10% decrease. Reported emissions went from 460 tCO₂e to 540 tCO₂e over the same span (up 18%).
What does an ENERGY STAR score of 78 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 78 means the building performs better than about 78% of its national peers. BuildingCensus bands the score into report-card grades; 78 falls in band B — above median (70–84). 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 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. 645 Water St's 42.0 kBtu/ft² across 125,750 sq ft works out to about 5.3 billion Btu (1,548 MWh-equivalent) in 2024. Its source EUI of 102.4 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,227,715 kWh of electricity and 10,910 therms of natural gas for the year.
Which law requires 645 Water St to report its energy use?
645 Water 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 2024 disclosure (source record nyc:10397120:2024). 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.
More multifamily housing buildings in New York City
- AKAM - 80-35 Springfield Boulevard· 125,691 sq ft · score 92 (A)
- Bronx Park - 333 E 181st· 125,685 sq ft · score 74 (B)
- PlymouthNY - 107 West 86th Street· 125,681 sq ft · score 92 (A)
- 83-15 Lefferts Boulevard· 125,650 sq ft · score 96 (A)
- Claremont Park LLC - Webster Avenue· 125,627 sq ft · score 97 (A)
- 45-25 Kissena Blvd· 125,626 sq ft · score 46 (D)
- Multifamily Housing buildings in New York City· 33,022 benchmarked
- All New York City benchmarked buildings· Local Law 84 (LL84)
- Most efficient large buildings in New York City
- Least efficient large buildings in New York City
- Biggest emitters in New York City
Frequently asked questions
What is 645 Water St's energy grade?
645 Water St scores 78 out of 100 on ENERGY STAR — band B, above median (70–84) — in its 2024 New York City disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does 645 Water St use?
Its 2024 site energy-use intensity was 42.0 kBtu/ft² (102.4 kBtu/ft² source) across 125,750 sq ft, including 1,227,715 kWh of electricity and 10,910 therms of natural gas.
What are 645 Water St's carbon emissions?
645 Water St reported 540 tCO₂e of greenhouse-gas emissions (4.3 kgCO₂e/ft²) for 2024.
Where is 645 Water St?
645 Water St is at 645 Water Street, in New York City, New York 10002. Its coordinates are 40.71138, -73.98265 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is 645 Water St and when was it built?
645 Water St has 125,750 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1964 as its year built. It is classed as multifamily housing.
Is 645 Water St covered by Local Law 84 (LL84)?
Yes — it appears in the 2024 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, “645 Water St, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/645-water-st-726af80e (data as of October 2, 2026).