420 9 Avenue, Manhattan

A 1929 retail store building on 9 Avenue carrying 5.34 FAR of unused commercial development rights on record under its C6-4 zoning.

420 9 Avenue is a retail store building in Manhattan, New York City (BBL 1007570001). The property is zoned C6-4, on a 8,797 sq ft lot, with 4 floors and 13 residential units. It was built in 1929. The lot is not inside a FEMA Special Flood Hazard Area. NYC municipal records show 1 open building violation for this lot as of 2026-07-05.

Property facts

BBL	1007570001
Borough	Manhattan — Community District 4
Neighborhood	Chelsea-Hudson Yards
ZIP code	10001
Zoning district	C6-4
Building class	K4 — retail store building (what’s a building class?)
Land use	04 — Mixed residential & commercial buildings
Lot area	8,797 sq ft
Floors	4
Residential units	13
Year built	1929
FAR	4.66 built · 10 max residential · 10 max commercial Learn: What is FAR?
Flood zone	Not in a FEMA Special Flood Hazard Area

Public records

0 open Department of Buildings violations
1 open ECB (OATH) violation — $1,250 in penalties due
0 open Housing Preservation & Development violations

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.