# 841 Park Avenue, Manhattan

Hospital · built c. 1930 · Block 1411, Lot 1.

On Umarelli: https://umarelli.org/nyc/1014110001/841-park-avenue

More construction in Upper East Side: https://umarelli.org/nyc/manhattan/upper-east-side.md

## Building permits

- Alteration, filed Oct 14, 2026, estimated cost $78K, described as “Nterior renovation of the exist'g interventional radiology suite #3 at 3RD floor & rooftop equipment screens at lower roof, including removal of non-bearing interior partiotions, lighting & finish work. No change to use, egress or occupancy”
- Alteration, filed Apr 27, 2026, estimated cost $390K, described as “Northwell Lenox Hill Chiller # 2 and # 3 Replacement Project: rearrange interior, non-bearing partition(s), install hung ceiling, wall and floor finishes as per plans filed herewith. No change to use, occupancy or egress under this…”
- Alteration, filed Apr 21, 2026, estimated cost $120K, described as “Northwell Lenox Hill: HVAC upgrades for Central Sterile Supply area, as per plans filed herewith.”
- Alteration, filed Apr 20, 2026, estimated cost $120K, described as “Northwell Lenox Hill: minor architectural scope in conjunction with Central Sterile Supply HVAC upgrades, as per plans filed herewith. No change in use, occupancy, or egress.”
- Alteration, filed Jan 5, 2026, estimated cost $14K, described as “Non-illuminated non-advertising accessory banner for a community use facility - in property lines - lenox hill hospital. No change of use, egress or occupancy.”
- Alteration, filed Sep 26, 2025, estimated cost $143K, described as “Lenox Hill Hospital: replacement in kind of Chiller in conjunction with hospital MRI, as per plans filed herewith.”
- Alteration, filed Apr 8, 2025, estimated cost $16K, described as “Northwell Lenox Hill: Wollman Lachman Pass Through Project: modify Plumbing and Sprinkler systems to conform with new interior layout as per plans filed herewith.”
- Alteration, filed Mar 13, 2025, estimated cost $533K, described as “Northwell Lenox Hill Biplane Project: modify HVAC system to conform with new layouts as per plans filed herewith.”
- Alteration, filed Mar 4, 2025, estimated cost $125K, described as “Northwell Lenox Hill Biplane project: modify plumbing & sprinkler systems to conform with new room layouts as per plans filed herewith.”
- Alteration, filed Mar 4, 2025, estimated cost $429K, described as “Northwell Lenox Hill - Biplane Project: rearrange interior, non-bearing partitions, install hung ceiling, wall & floors finishes as per plans filed herewith; no change to use, occupancy or egress under this application.”
- Alteration, filed Dec 16, 2024, estimated cost $13K, described as “Northwell Lenox Hill: Wollman-Lachman Pass Through Project: modify existing Mechanical system to conform with new interior layout as per plans filed herewith.”
- Alteration, filed Nov 18, 2024, estimated cost $290K, described as “Northwell Lenox Hill Hospital: Wollman Lachman Project: rearrange interior, non-bearing partitions, install hung ceiling, wall & floor finishes as per plans filed herewith; no change in use, occupancy or egress under this application.”
- Alteration, filed Oct 28, 2024, estimated cost $40K, described as “Northwell Health Lenox Hill Cath Lab B: installation of framing (including Unistrut) & related scope at portion of 11th floor, for support of medical equipment, as per plans filed herewith.”
- Alteration, filed Jun 7, 2024, estimated cost $15K, described as “Lenox Hill Hospital Wollman/Lachman: removal of interior, non-bearing partition at portion of 4th floor, as per plans filed herewith. No change to use, occupancy or egress under this application.”
- Alteration, filed Feb 16, 2024, described as “FISP INSPECTION (Facade Inspection Safety Program) INDUSTRIAL ROPE ACCESS TECHNIQUES AND METHODS. SEE ATTACHED PLANS Designated Primary Site supervisor: Kenneth Cole”
- Alteration, filed Feb 16, 2024, described as “FISP INSPECTION (Facade Inspection Safety Program) INDUSTRIAL ROPE ACCESS TECHNIQUES AND METHODS. SEE ATTACHED PLANS Designated Primary Site supervisor: Kenneth Cole”
- Alteration, filed Feb 16, 2024, described as “FISP INSPECTION (Facade Inspection Safety Program) INDUSTRIAL ROPE ACCESS TECHNIQUES AND METHODS. SEE ATTACHED PLANS Designated Primary Site supervisor: Kenneth Cole”
- Alteration, filed Feb 12, 2024, described as “FISP INSPECTION (Facade Inspection Safety Program) INDUSTRIAL ROPE ACCESS TECHNIQUES AND METHODS. SEE ATTACHED PLANS Designated Primary Site supervisor: Kenneth Cole”
- Alteration, filed Feb 12, 2024, described as “FISP INSPECTION (Facade Inspection Safety Program) INDUSTRIAL ROPE ACCESS TECHNIQUES AND METHODS. SEE ATTACHED PLANS Designated Primary Site supervisor: Kenneth Cole”
- Alteration, filed Feb 12, 2024, described as “FISP INSPECTION (Facade Inspection Safety Program) INDUSTRIAL ROPE ACCESS TECHNIQUES AND METHODS. SEE ATTACHED PLANS Designated Primary Site supervisor: Kenneth Cole”
- Alteration, filed Oct 25, 2023, estimated cost $1K, described as “Installation of temporary heavy duty sidewalk shed as per plans. No change in use, egress or occupancy. Sidewalk shed shall comply with chapter #33 of 2022 the NYC building code. Live load 300PSF.”
- Alteration, filed Oct 24, 2023, estimated cost $1K, described as “Installation of temporary heavy duty sidewalk shed as per plans. No change in use, egress or occupancy. Sidewalk shed shall comply with chapter #33 of 2022 the NYC building code. Live load 300PSF.”
- Alteration, filed Mar 14, 2023, estimated cost $31K, described as “Lenox Hill Hospital Nuclear Camera Project: installation of structural reinforcement to support medical equipment at portion of third floor”
- Alteration, filed Oct 24, 2022, estimated cost $36K, described as “Installation of a side mounted railing on existing parapet at 2nd floor set back. No change in use, egress or occupancy.”
- Alteration, filed Oct 24, 2022, estimated cost $90K, described as “Installation of a side mounted railing on existing parapet at 10th floor roof. No change in use, egress or occupancy.”

22 more, older permits are in this building’s full list on the map: https://umarelli.org/nyc/1014110001/841-park-avenue.

## Property taxes

- Assessment: $126,008,550
- Market value (city estimate): $280,019,000
- Taxable value: $0
- Assessed land: $38,790,000
- Assessed improvements: $87,218,550

## Tax breaks

- Nonprofit exemption (hospital), with no end date, about $13,669,408 a year below the full tax.

## Zoning

C1-8 (part of the lot is R10): floor area ratio 9.51 built, above the 7.52 base zoning allows, which bonuses, transfers or older rules can permit.

## Flood zone

Current FEMA flood map: zone X, minimal flood hazard.

## Board and land use applications

- Lenox Hill Hospital (City Planning P2017M0299): Zoning map change, Zoning text change, Special permit, Authorization, Certification, Completed, decided Aug 14, 2025. This is a private application by Lenox Hill Hospital, proposing a zoning map amendment, zoning text amendment (including MIH), special permit, authorization and certification. It seeks to facilitate redevelopment and enlargement of the…
- LENOX HILL HOSPITAL (City Planning P1990M0318): Completed, decided May 11, 1992. 90-077M: TO INCLUDE A ZONING MAP AMENDMENT & A BSA SPECIAL PERMIT (ZR73-64) TO MODIFY HEIGHT, SETBACK, REAR YARD, COURT REGULATIONS TO FACILITATE HOSPITAL EXPANSION

## In the news

[Lenox Hill Hospital Expansion Approved by City Council at 100 East 77th Street on Manhattan’s Upper East Side](https://newyorkyimby.com/2025/08/lenox-hill-hospital-expansion-approved-by-city-council-at-100-east-77th-street-on-manhattans-upper-east-side.html), New York YIMBY, Aug 17, 2025.

From New York City and Jersey City public records, refreshed within a day of each release. Sources: https://umarelli.org/sources. Methodology and corrections: https://umarelli.org/methodology