439 West 21st Street, Manhattan
Apartment building · 8 units · built c. 1853 · Block 719, Lot 19.
Building permits
- Alteration, filed Nov 4, 2026, estimated cost $229K, described as “Interior renovation & conversion from 8-family to 3-family dwelling, no change to existing use/egress/yards/bulk proposed under this action”
- Alteration, filed Oct 20, 2020, estimated cost $21K, described as “Removal & Replacement of Plumbing Fixtures to Unit #1A as per plans filed herewith. No change to use, occupancy or egress.”
Property taxes
- Assessment
- $979,650
- 2026–27 tax
- $79,394
- Market value (city estimate)
- $2,177,000
- Taxable value
- $638,264
- Assessed land
- $212,850
- Assessed improvements
- $766,800
Zoning
R7B: floor area ratio 2.28 built, 3.00 allowed by base zoning.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard. FEMA’s preliminary map: zone X, moderate risk: a 0.2% chance of flooding each year.
Recent sales
- Aug 28, 2026: $5,600,000, 3,600 sq ft ($1,556 per sq ft)
- Sep 15, 2017: $5,720,000
Open-market sales since 2016, from the Department of Finance’s sales files.
Landmarks
Part of Chelsea Historic District (Historic District). 15 Landmarks Preservation Commission permits are on file.