424 Madison Avenue, Manhattan
Commercial · built c. 1926 · Block 1284, Lot 56.
Building permits
- Alteration, filed May 28, 2026, estimated cost $170K, described as “Interior renovations for dental office at 4TH floor; no change in use, egress, or occupancy”
- Alteration, filed May 4, 2026, estimated cost $205K, described as “GC filing for Interior demolition and construction per plans; new finishes including carpet and paint throughout; replacement of all light fixtures and HVAC units; full bathroom renovations and new pantry. No change to use, egress, or…”
- Alteration, filed Apr 24, 2026, estimated cost $150K, described as “GC for Interior renovation adding offices and a small pantry; construction of demising walls for Suites 400 & 401; renovation of bathrooms, elevator lobby, and hallway. No change to use, egress, or occupancy.”
- Alteration, filed Feb 17, 2026, estimated cost $183K, described as “FILING GC FOR 8TH FLOOR INTERIOR RENOVATION, Construct New Offices, Pantry as per Plan. NO Change in use, Egress, or Occupancy”
- Alteration, filed Jul 17, 2025, estimated cost $27K, described as “Filing pl/sp for 2nd floor interior renovation, new offices, pantry, conference room, & bathrooms as per plan. 2. New finishes, ceiling, lighting, ac units, sprinkler heads”
- Alteration, filed Jul 17, 2025, estimated cost $105K, described as “Filing ms for 2nd floor interior renovation, new offices, pantry, conference room, & bathrooms as per plan. 2. New finishes, ceiling, lighting, ac units, sprinkler heads”
- Alteration, filed Jul 2, 2025, estimated cost $180K, described as “Filing gc for 2nd floor interior renovation, new offices, pantry, conference room, & bathrooms as per plan. 2. New finishes, ceiling, lighting, ac units, sprinkler heads”
- Alteration, filed Jun 18, 2025, estimated cost $13K, described as “Filing pl/sp for 6TH floor interior renovation - remove existing plumbing fixtures and install new plumbing fixtures as per plan. Remove existing sprinkler heads and branch piping and install new sprinkler heads and branch piping as per…”
- Alteration, filed Jun 18, 2025, estimated cost $105K, described as “Filing ms for 6TH floor interior renovation - construct new offices, pantry as per plan. 2. New open ceiling and finishes as per plan.”
- Alteration, filed Jun 16, 2025, estimated cost $140K, described as “FILING GC FOR 6TH FLOOR INTERIOR RENOVATION, Construct New Offices, Pantry as per Plan. NO Change in use, Egress, or Occupancy”
- Alteration, filed May 19, 2025, described as “Suspended scaffolds for facade restoration and inspection”
- Alteration, filed Dec 15, 2024, estimated cost $3K, described as “Installation of a non-illuminated business accessory sign . No change in use, egress or occupancy.”
- Alteration, filed Dec 15, 2024, estimated cost $3K, described as “Installation of a non-illuminated business accessory sign . No change in use, egress or occupancy.”
- Alteration, filed Sep 12, 2024, described as “Suspended outrigger with material hoist for facade repair works”
- Alteration, filed Aug 21, 2024, estimated cost $250K, described as “Filing gc for 5TH floor interior renovation”
- Alteration, filed May 10, 2024, estimated cost $20K, described as “Filing herewith for structural framing .”
- Alteration, filed May 3, 2024, estimated cost $42K, described as “Interior demo on the first and 001 floor as per plans , no change in use, egress or occupancy”
- Alteration, filed Apr 18, 2024, estimated cost $293K, described as “Interior cosmetic renovation of existing commercial retail store, propose delicatessen store on 001 , accessory storage use on cellar and mezzanine floor”
- Alteration, filed Feb 8, 2024, estimated cost $5K, described as “This Alteration is being filed for the sprinkler work at the subject premises as per plans submitted herewith. There are no change in use, egress or occupancy under this application.”
- Alteration, filed Jan 30, 2024, estimated cost $40K, described as “This Alteration application is being filed for the mechanical work at the subject premises as per plans submitted herewith. There are no change in use, egress or occupancy under this application.”
- Alteration, filed Jan 30, 2024, estimated cost $15K, described as “This Alteration is being filed for the plumbing work at the subject premises as per plans submitted herewith. There are change in use, egress or occupancy under this application.”
- Alteration, filed Jan 24, 2024, estimated cost $154K, described as “Application is being filed for the interior renovation of existing commercial space on the 9th floor. There are no change in use, egress or occupancy under this application.”
- Alteration, filed Jan 8, 2024, estimated cost $25K, described as “Infill of existing stair opening”
- Alteration, filed Oct 17, 2023, estimated cost $38K, described as “Dish - Installation of new telecommunication antenna sectors, GPS antenna and equipment cabinet on the roof. Installation of conduits and service room connection as per plans. All work is in compliance with TPPN 5/98. No change in use,…”
- Alteration, filed Mar 31, 2023, estimated cost $27K, described as “Removal and installation of new ductwork as shown on the drawings filed herewith. No change in use, egress, or occupancy.”
23 more, older permits are in this building’s full list on the map.
Property taxes
- Assessment
- $8,353,350
- 2026–27 tax
- $906,171
- Market value (city estimate)
- $18,563,000
- Taxable value
- $8,353,350
- Assessed land
- $1,894,500
- Assessed improvements
- $6,458,850
Zoning
C5-3: floor area ratio 14.23 built, 15.00 allowed by base zoning.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Board and land use applications
- Greater East Midtown - Special Subdistrict (City Planning P2016M0316): Completed, decided Aug 15, 2017. This is an application by NYC Department of City Planning requesting a text amendment to establish the East Midtown Subdistrict and extend the Special Midtown District, and to rezone a half-block area from C5-2 to C5-3 to reinforce the…