809 Madison Avenue, Manhattan
Condominium · 11 units · built c. 1925 · Block 1382, Lot 7502.
Building permits
- Alteration, filed Aug 30, 2026, described as “Facade inspection with minor caulking and pointing”
- Alteration, filed Aug 4, 2026, estimated cost $81K, described as “NYC DEV HUB CONSULT: 7/18/25 Structural work to add steel inside existing building as per plans.”
- Alteration, filed Jul 16, 2026, estimated cost $1K, described as “Gantry System installation for Alt 1 work approved under M01262427-I1”
- Alteration, filed Jul 15, 2026, estimated cost $3K, described as “Installation of system stair pipe scaffold required for egress as per plans. Scaffold shall comply with chapter #33 of the 2022 code. No change in use, egress or occupancy under this application.”
- Alteration, filed Mar 16, 2026, described as “Installation of suspended scaffold for facade work or inspection.”
- Alteration, filed Mar 10, 2026, estimated cost $1K, described as “DevHUB Consultation 7.18.2025. Temporary bracing in conjunction with Alt CO M01262427-I1.”
- Alteration, filed Feb 2, 2026, estimated cost $26K, described as “Installation of temporary needle beams as per plans. Needle beams shall comply with chapter #33 of the 2022 code. No change in use, egress or occupancy under this application.”
- Alteration, filed Jan 20, 2026, estimated cost $20K, described as “Installation of 7,100 lb dual personnel hoist cars as per plans during construction. Hoist shall comply with chapter #33 of the 2022 code. No change in use, egress or occupancy under this application.”
- Alteration, filed Dec 18, 2025, estimated cost $15K, described as “Installation of temporary dry pressurized standpipe & removal of existing standpipe in association with alteration, by others. Temporary standpipe to be removed after premenatnt standpipe is installed, by others. No change to use, egress,…”
- Alteration, filed Dec 12, 2025, estimated cost $50K, described as “DevHUB Consultation 7.18.2025. Application filed for new openings and repair on existing facade and select interior demolition as noted in plans. No change in use, egress or occupancy.”
- Alteration, filed Nov 10, 2025, estimated cost $17K, described as “Installation of temporary roof protection over adjacent properties as per plans. Roof protection shall comply with chapter #33 of the 2022 code. No change in use, egress or occupancy under this application.”
- Major Renovation — Mid-Rise, filed Oct 30, 2025, estimated cost $12.0M, 12 units in all, 14 stories, described as “DevHUB Consultation 7.18.2025 @2pm. Application filed to enlarge building horizontally and vertically.”
- Alteration, filed Oct 15, 2025, estimated cost $26K, described as “Installation of pipe scaffolding as per plans. Pipe scaffold shall comply with chapter #33 of the 2022 code. No change in use, egress or occupancy under this application.”
- Alteration, filed Sep 30, 2025, estimated cost $17K, described as “Installation of heavy duty sidewalk shed and construction plywood fence as per plans. Temporary equipment shall comply with chapter #33 of the 2022 code. No change in use, egress or occupancy under this application.”
- Alteration, filed May 9, 2025, estimated cost $1K, described as “Proposed installation of temporary pipe scaffold as per plans. Work shall comply with chapter #33 of 2022 the NYC building code. No change in use, occupancy, or egress under this application.”
Property taxes
- Assessment
- $8,582,400
- 2026–27 tax
- $1,041,967
- Market value (city estimate)
- $19,072,000
- Taxable value
- $8,498,226
- Assessed land
- $1,323,000
- Assessed improvements
- $7,259,400
- Condo units with their own tax lots
- 3
Zoning
C5-1: floor area ratio 9.20 built, 10.00 allowed by base zoning.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Recent sales
- Sep 18, 2025: $49,000,000, Apt RET 2, sold with other lots
- Nov 7, 2024: $9,000,000, Apt RET 1
Open-market sales since 2016, from the Department of Finance’s sales files.
Landmarks
Part of Upper East Side Historic District (Historic District). 10 Landmarks Preservation Commission permits are on file.
In the news
Renderings Revealed for 809 Madison Avenue’s Expansion on Manhattan’s Upper East Side, New York YIMBY, Sep 24, 2025.