841 Park Avenue, Manhattan
Hospital · built c. 1930 · Block 1411, Lot 1.
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.
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, New York YIMBY, Aug 17, 2025.