433 West 21 Street, Manhattan
A 1930 elevator apartment building on West 21 Street with 57 open violations on record across city enforcement files.
433 West 21 Street is an elevator apartment building in Manhattan, New York City (BBL 1007190020). The property is zoned R7B, on a 8,381 sq ft lot, with 13 floors and 69 residential units. It was built in 1930. The lot is not inside a FEMA Special Flood Hazard Area. NYC municipal records show 57 open building violations for this lot as of 2026-07-05.
Property facts
| BBL | 1007190020 |
|---|---|
| Borough | Manhattan — Community District 4 |
| Neighborhood | Chelsea-Hudson Yards |
| Zoning district | R7B |
| Building class | D1 — elevator apartment building (what’s a building class?) |
| Land use | 03 — Multi-family elevator buildings |
| Lot area | 8,381 sq ft |
| Floors | 13 |
| Residential units | 69 |
| Year built | 1930 |
| FAR | 7.63 built · 3 max residential · 0 max commercial Learn: What is FAR? |
| Historic district | Chelsea Historic District |
| Flood zone | Not in a FEMA Special Flood Hazard Area |
Public records
- 10 open Department of Buildings violations
- 2 open ECB (OATH) violations — $2,500 in penalties due
- 45 open Housing Preservation & Development violations
- Façade safety filing status: SWARMP (latest filing 2023-02-14)
Violation counts as of 2026-07-05.
Absence of a record means none on file in NYC municipal records — not a certification of compliance.
The complete dossier also covers:
- Buildable floor area (residential & commercial)
- Recorded ownership & last sale
- Recorded mortgages & open debt stack
- LL97 carbon exposure by compliance period
- Flood coverage percentage & base flood elevation
- Climate projections for this lot
- Open permits & construction pipeline
- Distress signal convergence
- Air rights & transferable development rights
- Comparable sales (Pro)
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Data: NYC municipal records (Departments of City Planning, Buildings, Finance) and FEMA. See our sources and methodology. Data as of 2026-07-11.