446 West 20th Street, Manhattan
Two-family · built c. 1855 · Block 717, Lot 67.
Building permits
- Alteration, filed Sep 14, 2026, estimated cost $5K, described as “Installation of 300PSF sidewalk shed and pipe scaffolding as per plans. All equipment shall comply with chapter #33 of the 2022 code no change in use, egress or occupancy under this application.”
- Alteration, filed Dec 11, 2025, estimated cost $270K, described as “Renovate existing two family residence. Remove interior partitions and doors, new partitions and doors, replacement of exterior windows, patching of exterior brickwork. Plumbing and mechanical plans to be filed separately by others.”
- Alteration, filed Aug 25, 2025, estimated cost $139K, described as “Removal of existing & installation of new mechanical equipment as part of Limited Townhouse Renovation Upgrade. No change to use, occupancy, or egress.”
- Alteration, filed Aug 25, 2025, estimated cost $64K, described as “Removal, relocation, replacement, and installation of plumbing fixtures as part of Limited Townhouse Renovation Upgrade. No change to use, occupancy, or egress.”
Property taxes
- Assessment
- $462,240
- 2026–27 tax
- $40,935
- Market value (city estimate)
- $7,704,000
- Taxable value
- $206,294
- Assessed land
- $169,560
- Assessed improvements
- $292,680
Zoning
R7B: floor area ratio 2.21 built, 3.00 allowed by base zoning.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard. FEMA’s preliminary map: zone AE, high risk: a 1% chance of flooding each year, base flood elevation 10 ft (NAVD88).
Landmarks
Part of Chelsea Historic District (Historic District). 12 Landmarks Preservation Commission permits are on file.