Century - 508 - 516 East 78th Street (Child - 509 East 77th)
Multifamily Housing in New York City, NY · 509 EAST 77 STREET · 10021
At a glance
Century - 508 - 516 East 78th Street (Child - 509 East 77th) is a 50,275-square-foot multifamily housing building at 509 EAST 77 STREET in New York City, New York, built in 1909. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 1 out of 100 (grade D), a site energy-use intensity of 350.0 kBtu/ft² and 1,034 tCO₂e of greenhouse-gas emissions. That score is higher than 0% 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 | 1 (band D) |
| Site EUI | 350.0 kBtu/ft² |
| Source EUI | 423.2 kBtu/ft² |
| GHG emissions | 1,034 tCO₂e |
| GHG intensity | 20.6 kgCO₂e/ft² |
| Electricity | 469,293 kWh |
| Natural gas | 159,927 therms |
| Gross floor area | 50,275 sq ft |
| Source record | nyc:4039191:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 1 | -19 | 350.0 kBtu/ft² | 1,034 tCO₂e |
| 2023 | 20 | 173.1 kBtu/ft² | 1,017 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.
Own or manage this building? Claim it to correct the record and get compliance alerts.
Location
- Address
- 509 EAST 77 STREET
- City
- New York City
- State
- New York
- ZIP
- 10021
- Coordinates
- 40.76996, -73.95109
Within ~1 km
Nearby benchmarked buildings
- NYP Cornell (East Campus)score 47
Hospital (General Medical & Surgical) · 2,801,795 sq ft
Other - Specialty Hospital · 2,490,355 sq ft
Mixed Use Property · 2,437,399 sq ft
- Weill Cornell Medical Centerscore —
Hospital (General Medical & Surgical) · 2,405,480 sq ft
Laboratory · 1,862,814 sq ft
Laboratory · 1,546,119 sq ft
See also: most efficient in New York City · biggest emitters
How does Century - 508 - 516 East 78th Street (Child - 509 East 77th) 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. Century - 508 - 516 East 78th Street (Child - 509 East 77th)'s ENERGY STAR score of 1 compares with an average of 63 across the 22,829 that report a score; it scores higher than 0% of them and lower than 97%. Its site EUI of 350.0 kBtu/ft² is about 367% 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 20.6 kgCO₂e/ft² is about 295% above the group average of 5.2 kgCO₂e/ft².
At 50,275 sq ft, it is about half of the average floor area of 100,951 sq ft for those buildings. It was built in 1909, 43 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 Century - 508 - 516 East 78th Street (Child - 509 East 77th)'s energy performance changed over time?
BuildingCensus holds 2 New York City disclosures for Century - 508 - 516 East 78th Street (Child - 509 East 77th), covering report years 2023–2024. Its ENERGY STAR score went from 20 in 2023 to 1 in 2024 (-19 points); its best year on file was 2023, at 20. Site EUI moved from 173.1 kBtu/ft² (2023) to 350.0 kBtu/ft² (2024), an 102% increase. Reported emissions went from 1,017 tCO₂e to 1,034 tCO₂e over the same span (up 2%).
What does an ENERGY STAR score of 1 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: 1 is the bottom of the scale. BuildingCensus bands the score into report-card grades; 1 falls in band D — lowest band (1–54). It sits 74 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. Century - 508 - 516 East 78th Street (Child - 509 East 77th)'s 350.0 kBtu/ft² across 50,275 sq ft works out to about 17.6 billion Btu (5,157 MWh-equivalent) in 2024. Its source EUI of 423.2 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 469,293 kWh of electricity and 159,927 therms of natural gas for the year.
Which law requires Century - 508 - 516 East 78th Street (Child - 509 East 77th) to report its energy use?
Century - 508 - 516 East 78th Street (Child - 509 East 77th) 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:4039191:2024). 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
- 2715 Webb Avenue· 50,274 sq ft
- 105 East 16th Street· 50,263 sq ft · EUI 48.8 kBtu/ft²
- CITADEL ESTATES LLC-2401· 50,258 sq ft · score 79 (B)
- 5th Corp - C Buildings (4746,35)· 50,256 sq ft · score 1 (D)
- 262 West 107th Street· 50,255 sq ft · score 65 (C)
- 262 West 107th Street· 50,255 sq ft · score 81 (B)
- 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 Century - 508 - 516 East 78th Street (Child - 509 East 77th)'s energy grade?
Century - 508 - 516 East 78th Street (Child - 509 East 77th) scores 1 out of 100 on ENERGY STAR — band D, lowest band (1–54) — in its 2024 New York City disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Century - 508 - 516 East 78th Street (Child - 509 East 77th) use?
Its 2024 site energy-use intensity was 350.0 kBtu/ft² (423.2 kBtu/ft² source) across 50,275 sq ft, including 469,293 kWh of electricity and 159,927 therms of natural gas.
What are Century - 508 - 516 East 78th Street (Child - 509 East 77th)'s carbon emissions?
Century - 508 - 516 East 78th Street (Child - 509 East 77th) reported 1,034 tCO₂e of greenhouse-gas emissions (20.6 kgCO₂e/ft²) for 2024.
Where is Century - 508 - 516 East 78th Street (Child - 509 East 77th)?
Century - 508 - 516 East 78th Street (Child - 509 East 77th) is at 509 EAST 77 STREET, in New York City, New York 10021. Its coordinates are 40.76996, -73.95109 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is Century - 508 - 516 East 78th Street (Child - 509 East 77th) and when was it built?
Century - 508 - 516 East 78th Street (Child - 509 East 77th) has 50,275 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1909 as its year built. It is classed as multifamily housing.
Is Century - 508 - 516 East 78th Street (Child - 509 East 77th) 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).
Working with New York City building benchmarking records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Century - 508 - 516 East 78th Street (Child - 509 East 77th), New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/century-508-516-east-78th-street-child-509-east-77th-25610be1 (data as of October 2, 2026).