Morningside Clark South
Hospital (General Medical & Surgical) in New York City, NY · 1091 AMSTERDAM AVENUE · 10025
At a glance
Morningside Clark South is a 535,359-square-foot hospital (general medical & surgical) at 1091 AMSTERDAM AVENUE in New York City, New York, built in 1896. In its 2024 New York City benchmarking disclosure it reported a site energy-use intensity of 83.2 kBtu/ft² and 5,123 tCO₂e of greenhouse-gas emissions.
Local Law 84 (LL84) · reporting year 2024
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 83.2 kBtu/ft² |
| Source EUI | 232.7 kBtu/ft² |
| GHG emissions | 5,123 tCO₂e |
| GHG intensity | 9.6 kgCO₂e/ft² |
| Electricity | 13,036,300 kWh |
| Natural gas | 0 therms |
| Water use | 13,801 kgal |
| Gross floor area | 535,359 sq ft |
| Source record | nyc:21028436:2024 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2024latest | — | 83.2 kBtu/ft² | 5,123 tCO₂e | |
| 2023 | — | 80.4 kBtu/ft² | 4,708 tCO₂e | |
| 2022 | — | 79.7 kBtu/ft² | 3,630 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
- 1091 AMSTERDAM AVENUE
- City
- New York City
- State
- New York
- ZIP
- 10025
- Coordinates
- 40.80522, -73.96221
Within ~1 km
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See also: most efficient in New York City · biggest emitters
How does Morningside Clark South compare with other hospital (general medical & surgical) buildings in New York City?
The latest disclosures cover 226 hospital (general medical & surgical) buildings in New York City, out of 48,310 buildings citywide. Its site EUI of 83.2 kBtu/ft² is about 67% below the average of 248.6 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 9.6 kgCO₂e/ft² is about half of the group average of 18.9 kgCO₂e/ft².
At 535,359 sq ft, it is about 19% above the average floor area of 450,487 sq ft for those buildings. It was built in 1896, 56 years earlier than the group's average year built (1952). Across all 24 jurisdictions BuildingCensus covers, the 748 hospital (general medical & surgical) buildings average an ENERGY STAR score of 59 and a site EUI of 238.7 kBtu/ft².
How has Morningside Clark South's energy performance changed over time?
BuildingCensus holds 3 New York City disclosures for Morningside Clark South, covering report years 2022–2024. Site EUI moved from 79.7 kBtu/ft² (2022) to 83.2 kBtu/ft² (2024), an 4% increase. Reported emissions went from 3,630 tCO₂e to 5,123 tCO₂e over the same span (up 41%).
What does a site EUI of 83.2 kBtu/ft² mean?
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. Morningside Clark South's 83.2 kBtu/ft² across 535,359 sq ft works out to about 44.5 billion Btu (13,054 MWh-equivalent) in 2024. Its source EUI of 232.7 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 13,036,300 kWh of electricity, 0 therms of natural gas and 13,801 thousand gallons of water for the year.
Which law requires Morningside Clark South to report its energy use?
Morningside Clark South 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:21028436:2024). 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 hospital (general medical & surgical) buildings in New York City
- Jamaica Hospital - AB· 532,011 sq ft · score 91 (A)
- Maimonides - 1024 48th Street· 530,470 sq ft · score 100 (A)
- HSS - Main Hospital· 528,808 sq ft · score 12 (D)
- The Wakefield Hospital Campus· 527,197 sq ft · score 56 (C)
- NYU Langone Hospital - Brooklyn· 525,896 sq ft · score 53 (D)
- One Brooklyn Health - 1 Brookdale Plaza· 511,776 sq ft · score 72 (B)
- Hospital (General Medical & Surgical) buildings in New York City· 226 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 Morningside Clark South's energy grade?
Morningside Clark South did not report an ENERGY STAR score in its 2024 disclosure, but its site energy-use intensity was 83.2 kBtu/ft².
How much energy does Morningside Clark South use?
Its 2024 site energy-use intensity was 83.2 kBtu/ft² (232.7 kBtu/ft² source) across 535,359 sq ft, including 13,036,300 kWh of electricity and 0 therms of natural gas.
What are Morningside Clark South's carbon emissions?
Morningside Clark South reported 5,123 tCO₂e of greenhouse-gas emissions (9.6 kgCO₂e/ft²) for 2024.
Where is Morningside Clark South?
Morningside Clark South is at 1091 AMSTERDAM AVENUE, in New York City, New York 10025. Its coordinates are 40.80522, -73.96221 (latitude, longitude), as published in the Energy and Water Data Disclosure file.
How big is Morningside Clark South and when was it built?
Morningside Clark South has 535,359 sq ft of gross floor area, as reported in its 2024 disclosure. The disclosure lists 1896 as its year built. It is classed as hospital (general medical & surgical).
Is Morningside Clark South 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, “Morningside Clark South, New York City, New York — 2024 benchmarking disclosure”, https://buildingcensus.com/buildings/new-york-city/morningside-clark-south-9a6e5437 (data as of October 2, 2026).