343 West 21st Street, Manhattan
Apartment building · 15 units · built c. 1920 · Block 745, Lot 13.
Building permits
- Alteration, filed Sep 24, 2026, estimated cost $26K, described as “Replacement of the chimney at the roof level only including minor masonry work, liner replacement, with associated mechanical and structural work. The existing membrane on the roof floor is to remain. No change to the use, egress, or…”
Property taxes
- Assessment
- $728,550
- 2026–27 tax
- $85,742
- Market value (city estimate)
- $1,619,000
- Taxable value
- $689,300
- Assessed land
- $112,500
- Assessed improvements
- $616,050
Zoning
R7B: floor area ratio 2.84 built, 3.00 allowed by base zoning.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.