437 Madison Avenue, Manhattan
Commercial · built 1967 · Block 1285, Lot 21.
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Building permits
- Alteration, filed Sep 1, 2026, estimated cost $24K, described as “Alteration type 1 application filied to amend the existing certificate of occupancy. Proposed scope of work on the 2ND floor resulting in an increase of the permitted occupant load from 210 persons to 370 persons.”
- Alteration, filed Jul 15, 2026, estimated cost $4.3M, described as “Interior renovation as per plans filed herewith.”
- Alteration, filed Jul 6, 2026, estimated cost $2.0M, described as “Modification to Mechanical Systems as per plans filed herewith.”
- Alteration, filed Jul 6, 2026, estimated cost $1.5M, described as “Modification to Plumbing, Sprinkler and Standpipe Systems as per plans filed herewith.”
- Alteration, filed May 12, 2026, estimated cost $50K, described as “Remove and construct interior partitions, ceilings and doors as shown on drawings filed herewith. No change in use, egress or occupancy.”
- Alteration, filed Apr 20, 2026, estimated cost $1.4M, described as “Remove existing plate and frame heat exchanger and replace with new. Reconnect existing piping to new heat exchanger. Replace pump motors. Upgrade internal cooling tower components.”
- Alteration, filed Apr 17, 2026, estimated cost $200K, described as “Remove and construct interior partitions, ceilings & doors.”
- Alteration, filed Apr 9, 2026, estimated cost $200K, described as “Partially demolish existing mechanical systems, ductwork, piping, equipment, etc. Furnish and install new mechanical piping and valves, accessories, etc. Provide all mechanical services, materials, etc. Perform water testing and balancing.…”
- Alteration, filed Mar 26, 2026, estimated cost $1.1M, described as “Interior renovations/alterations inclusive of removal and new installation of interior non-bearing partitions and ceiling finishes.”
- Alteration, filed Mar 25, 2026, estimated cost $1.4M, described as “Removal and replacement of roof membrane systems of all roofs as shown on drawings. No change in use, egress or occupancy.”
- Alteration, filed Mar 23, 2026, estimated cost $1K, described as “Erect sign tag as non-illuminated plate letter (sign 1) @ madison avenue elevation " santader with logo "”
- Alteration, filed Mar 19, 2026, estimated cost $1K, described as “Erect sign tag as non-illuminated plate letter (sign 3) @ east 50TH street elevation " santader with logo "”
- Alteration, filed Mar 19, 2026, estimated cost $1K, described as “Erect sign tag as non-illuminated plate letter (sign 4) @ east 50TH street elevation " santader with logo "”
- Alteration, filed Mar 19, 2026, estimated cost $1K, described as “Erect sign tag as non-illuminated plate letter (sign 5) @east 50TH street elevation " santader with logo "”
- Alteration, filed Mar 19, 2026, estimated cost $1K, described as “Erect sign tag as non-illuminated plate letter (sign 2) @ madison avenue elevation " santader with logo "”
- Alteration, filed Mar 19, 2026, estimated cost $1K, described as “Erect sign tag as non-illuminated plate letter (sign 6) @ east 50TH street elevation " santader with logo "”
- Alteration, filed Mar 5, 2026, estimated cost $893K, described as “Interior office renovation on 4TH floor as per plans.”
- Alteration, filed Dec 11, 2025, estimated cost $3.5M, described as “Interior office renovation on 3RD floor as indicated on plans filed herewith. No change of use, egress or occupancy.”
- Alteration, filed Nov 7, 2025, estimated cost $6.2M, described as “Remove and construct interior partitions, ceilings & doors as shown on drawings filed herewith. No change in use, egress or occupancy.”
- Alteration, filed Sep 8, 2025, estimated cost $500K, described as “Removal and construction of interior partitions, ceilings & doors as shown on drawings filed herewith. No change to use, egress or occupancy.”
- Alteration, filed Jul 10, 2025, estimated cost $10K, described as “Replacement of air conditioning unit for the server room. No change in use egress and occupancy.”
- No Work, filed May 29, 2025, described as “The event is company meeting estimated to have 119 people in a lecture type town hall arrangement with non fixed seating in a 1,571 square foot room.”
- No Work, filed May 29, 2025
- Alteration, filed May 28, 2025, estimated cost $379K, described as “General Construction taking place on the 25th Floor (Construction)/26th Floor (Marketing) as per plans filed herewith. No change in Use, Egress or Occupancy.”
- Alteration, filed May 28, 2025, estimated cost $12K, described as “Plumbing modifications taking place on the 25th Floor Construction/26th Floor (Marketing) Floor as per plans filed herewith. No change in Use, Egress or Occupancy.”
79 more, older permits are in this building’s full list on the map.
Property taxes
- Assessment
- $148,483,800
- 2026–27 tax
- $15,558,946
- Assessed land
- $34,605,000
- Assessed improvements
- $113,878,800
Zoning
C5-3 (part of the lot is C5-2.5): floor area ratio 21.81 built, above the 15.00 base zoning allows, which bonuses, transfers or older rules can permit.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.