Mt. Sinai - 1249 Park Ave
Multifamily Housing in New York City, NY · 1247 PARK AVENUE · 10029
At a glance
Mt. Sinai - 1249 Park Ave is a 124,564-square-foot multifamily housing building at 1247 PARK AVENUE in New York City, New York, built in 1966. In its 2024 New York City benchmarking disclosure it reported an ENERGY STAR score of 65 out of 100 (grade C), a site energy-use intensity of 75.1 kBtu/ft² and 649 tCO₂e of greenhouse-gas emissions. That score is higher than 45% 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 | 65 (band C) |
| Site EUI | 75.1 kBtu/ft² |
| Source EUI | 108.7 kBtu/ft² |
| GHG emissions | 649 tCO₂e |
| GHG intensity | 5.2 kgCO₂e/ft² |
| Electricity | 628,717 kWh |
| Natural gas | 63,112 therms |
| Gross floor area | 124,564 sq ft |
| Source record | nyc:2794417:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | 65 | -28 | 75.1 kBtu/ft² | 649 tCO₂e |
| 2023 | 93 | +42 | 49.7 kBtu/ft² | 435 tCO₂e |
| 2022 | 51 | 93.2 kBtu/ft² | 699 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
- 1247 PARK AVENUE
- City
- New York City
- State
- New York
- ZIP
- 10029
- Coordinates
- 40.78684, -73.95232
Within ~1 km
Nearby benchmarked buildings
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- CARVER Bldgs 1-6score 12
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See also: most efficient in New York City · biggest emitters
How does Mt. Sinai - 1249 Park Ave 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. Mt. Sinai - 1249 Park Ave's ENERGY STAR score of 65 compares with an average of 63 across the 22,829 that report a score; it scores higher than 45% of them and lower than 54%. Its site EUI of 75.1 kBtu/ft² is roughly in line with the average of 74.9 kBtu/ft². Its emissions intensity of 5.2 kgCO₂e/ft² is roughly in line with the group average of 5.2 kgCO₂e/ft².
At 124,564 sq ft, it is about 23% above the average floor area of 100,951 sq ft for those buildings. It was built in 1966, 14 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 Mt. Sinai - 1249 Park Ave's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for Mt. Sinai - 1249 Park Ave, covering report years 2022–2024. Its ENERGY STAR score went from 51 in 2022 to 65 in 2024 (+14 points); its best year on file was 2023, at 93. Site EUI moved from 93.2 kBtu/ft² (2022) to 75.1 kBtu/ft² (2024), a 19% decrease. Reported emissions went from 699 tCO₂e to 649 tCO₂e over the same span (down 7%).
What does an ENERGY STAR score of 65 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 65 means the building performs better than about 65% of its national peers. BuildingCensus bands the score into report-card grades; 65 falls in band C — below median (55–69). It sits 10 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. Mt. Sinai - 1249 Park Ave's 75.1 kBtu/ft² across 124,564 sq ft works out to about 9.4 billion Btu (2,742 MWh-equivalent) in 2024. Its source EUI of 108.7 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 628,717 kWh of electricity and 63,112 therms of natural gas for the year.
Which law requires Mt. Sinai - 1249 Park Ave to report its energy use?
Mt. Sinai - 1249 Park Ave 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:2794417:2024). 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.
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- 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 Mt. Sinai - 1249 Park Ave's energy grade?
Mt. Sinai - 1249 Park Ave scores 65 out of 100 on ENERGY STAR — band C, below median (55–69) — in its 2024 New York City disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Mt. Sinai - 1249 Park Ave use?
Its 2024 site energy-use intensity was 75.1 kBtu/ft² (108.7 kBtu/ft² source) across 124,564 sq ft, including 628,717 kWh of electricity and 63,112 therms of natural gas.
What are Mt. Sinai - 1249 Park Ave's carbon emissions?
Mt. Sinai - 1249 Park Ave reported 649 tCO₂e of greenhouse-gas emissions (5.2 kgCO₂e/ft²) for 2024.
Where is Mt. Sinai - 1249 Park Ave?
Mt. Sinai - 1249 Park Ave is at 1247 PARK AVENUE, in New York City, New York 10029. Its coordinates are 40.78684, -73.95232 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is Mt. Sinai - 1249 Park Ave and when was it built?
Mt. Sinai - 1249 Park Ave has 124,564 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1966 as its year built. It is classed as multifamily housing.
Is Mt. Sinai - 1249 Park Ave 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, “Mt. Sinai - 1249 Park Ave, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/mt-sinai-1249-park-ave-dfdded78 (data as of October 2, 2026).