# 1233 York Avenue, Manhattan

Vacant land · Block 1461, Lot 21.

On Umarelli: https://umarelli.org/nyc/1014610021/431-east-66-street

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

## Building permits

- New Building — Tower, filed Apr 21, 2025, 28 stories, described as “Construction of a new inpatient clinical building.”
- Alteration, filed Oct 1, 2026, estimated cost $27K, described as “Mini crane placement. This application involves no change in use, occupancy or egress.”
- Alteration, filed Jul 13, 2026, estimated cost $5K, described as “Installation and use of scaffold stair as per plans filed herewith. This application is filed in conjunction with M01205691-S2-FO.”
- Alteration, filed Feb 19, 2025, estimated cost $5K, described as “Temporary trolley beam system as per drawings. Trolley beam system shall comply with ch #33 of the NYC bc. No change in use, occupancy or egress under this application. Scaffold filed separately.”
- Alteration, filed Dec 9, 2024, estimated cost $10K, described as “Single 2500 # capacity material only hoist during bldg demolition, filed sep. Material hoist shall comply with ch #33 of the NYC bc. No change in use, occupancy or egress under this application.”
- Alteration, filed Nov 20, 2024, estimated cost $20K, described as “Temporary needle beam platform as per drawings. Needle beam platform shall comply with ch #33 of the NYC bc. Supported scaffold filed separately. No change in use, occupancy or egress under this application.”
- Alteration, filed Nov 11, 2024, estimated cost $5K, described as “Temporary overhead protection as per drawings during building demolition, filed sep. Overhead protection shall comply with ch #33 of the NYC bc. No change in use, occupancy or egress under this application.”
- Alteration, filed Nov 11, 2024, estimated cost $20K, described as “Temporary needle beam platform as per drawings. Needle beam platform shall comply with ch #33 of the NYC bc. Supported scaffold filed separately. No change in use, occupancy or egress under this application.”
- Alteration, filed Oct 23, 2024, estimated cost $3K, described as “Filing drawings herewith to convert existing wet standpipe to dry standpipe for demolition of the building for Memorial Sloan Kettering.”
- Alteration, filed Aug 28, 2024, estimated cost $10K, described as “Temporary system scaffold stair tower as per drawings. System scaffold stair tower shall comply with ch #33 of the NYC bc. No change in use, occupancy or egress under this application.”
- Alteration, filed Aug 2, 2024, estimated cost $93K, described as “Installation of a temporary dry sprinkler loop on the cellar and sub-cellar level at mskcc as per plans submitted herewith, no change in use, egress or occupancy group.”
- Alteration, filed Jun 5, 2024, estimated cost $10K, described as “Temporary system scaffold as per drawings. System scaffold shall comply with ch #33 of the NYC bc. No change in use, occupancy or egress under this application.”
- Alteration, filed May 30, 2024, estimated cost $10K, described as “Heavy duty sidewalk shed during NB construction, filed sep. Sidewalk shed shall comply with ch #33 of the NYC bc. No change in use, occupancy or egress under this application. Dot permits by others for shed installed on sidewalk/roadway”
- Alteration, filed May 30, 2024, estimated cost $20K, described as “Equipment use demo hoist-cars a&b: dual 6000 # capacity personnel/material hoists during bldg demo, filed sep. Hoists shall comply with ch #33 of the NYC bc. No change in use, occupancy or egress under this application. Elevator…”
- Alteration, filed May 30, 2024, estimated cost $20K, described as “Equipment use demo hoist-cars c&d: dual 7000 # capacity personnel/material hoists during bldg demo, filed sep. Hoists shall comply with ch #33 of the NYC bc. No change in use, occupancy or egress under this application. Elevator…”
- Alteration, filed May 30, 2024, estimated cost $50K, described as “Construction fence as per drawings during new bldg const, filed sep. Construction fence shall comply with ch #33 of the NYC bc. No change in use, occupancy or egress under this application. Dot permits by others for fence installed on…”
- Alteration, filed Jan 19, 2024, described as “Installation of temporary sidewalk shed as per plan. No change in use, egress or occupancy.”
- Alteration, filed Dec 25, 2023, 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 27, 2023, estimated cost $4.0M, described as “Mpp 139: interior demolition of non-structural building elements with use of mechanical equipment to prepare building for full demolition, filed separately under M00924249-I1. Equipment use filed separately under M00927298-S1.”
- Demolition, filed Sep 6, 2023, estimated cost $20.6M, described as “Mpp 139: full demolition of (2) tower memorial sloan-kettering sloan house (20-story) & scholars residence (23-story) using mechanical means.”
- Alteration, filed Sep 28, 2021, estimated cost $5K, described as “Installation of 300 psf sidewalk shed as per plans. Sidewalk shed shall comply with chapter #33 of the 2014 code. No change inuse, egress or occupancy under this application.”
- Alteration, filed Aug 5, 2021, estimated cost $276K, described as “Filing to remove and replace all existing cracked, spalled or otherwise damaged bricks at all elevations of the stair/elevator bulkhead on the Roof.”
- Alteration, filed Aug 3, 2020, estimated cost $1K, described as “Installation of heavy duty 256 lf sidewalk shed as per plans. No change to egress, use, or occupancy.”
- Alteration, filed Jun 25, 2020, estimated cost $32K, described as “Installation of heavy duty sidewalk shed during building alteration, filed separately. Sidewalk shed shall comply with chapter #33 of the NYC building code. No change in use, occupancy or egress under this application.”
- Alteration, filed May 27, 2020, estimated cost $250, described as “Illuminated non advertising accessory directional sign for hospital - memorial sloan kettering. No change to use, egress or occupancy.”

## Property taxes

- Assessment: $6,975,000
- Market value (city estimate): $15,500,000
- Taxable value: $6,975,000
- Assessed land: $6,975,000

## Zoning

R10 (part of the lot is R9): floor area ratio 0.00 built, 10.00 allowed by base zoning.

## Flood zone

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

## Board and land use applications

- MSK Pavilion (City Planning 2022M0359): Special permit, Zoning map change, Zoning text change, Authorization, Certification, Completed, filed Jan 23, 2024, decided Jul 24, 2025. This is a private application by MSK requesting a zoning map amendment from R8 to R9, text amendment to ZR 79-43, authorizations per ZR 79-21, a ZR 79-43 special permit, modifications to the Large Scale Community Facility Development and…
- MEMORIAL SLOAN-KETTERING CANCER CTR (City Planning P2001M0310): Completed, decided Dec 24, 2001. 01DCP050M: PROPOSES TO REZONE THE MIDBLOCK AREA BETWEEN E. 66TH & 69TH STS AND YORK AND 1ST AVES. FROM R8 TO R9 TO DESIGNATE THE MS KCC CAMPUS ON THESE 3 BLOCKS AS A LSCFD

## In the news

[Demolition Prep Underway for MSK Hospital Skyscraper at 1233 York Avenue on Manhattan’s Upper East Side](https://newyorkyimby.com/2024/12/demolition-prep-underway-for-msk-hospital-skyscraper-at-1233-york-avenue-on-manhattans-upper-east-side.html), New York YIMBY, Dec 16, 2024.

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