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Predominantly retail with other uses
421 3 AVENUE
MANHATTAN · BIN 1019917
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1910Year Built
4Stories
K4Building Class
C2-8Zoning
6,888 sfGross Floor Area
7Units
Rent Stabilized
Predominantly retail with other uses · Owner of record: 419-423 THIRD AVENUE, LLC · 2,716 sf lot · 2.54 FAR built · Flood zone X
Locations of Work
ArchitectureMechanicalPlumbingGeneral
Permit Issued — active, not yet Signed-off
Floor 1Under Construction24p · 1 filing · 20 docs
▾Design Consultants (Architect / Engineer of Record)
FirmFilingsMost Recent
LU NING ARCHITECTURE, PLLC312/11/2025
KZ ENGINEERING, P.C308/17/2022
▾Special Inspection Agencies
AgencyLicense #FilingsMost Recent
LU NING ARCHITECTURE, PLL1155312/11/2025
Nothing on file for this building.
Nothing on file for this building.
Nothing on file for this building.
▾Field Inspections (DOB CAP) — 8
DateTypeResultReport
04/22/2026Certified Sprinkler-SP-Fixtures-FinishCertifiedView ↗
04/15/2026Certified Sprinkler-SP-Piping Dry/Wet-Hydrostatic TestCertifiedView ↗
01/02/2026Certified Gas-Gas-Piping-RoughingCertifiedView ↗
01/02/2026Certified Storm Drainage-ST-Piping-RoughingCertifiedView ↗
01/02/2026Certified Storm Drainage-ST-Piping-UndergroundCertifiedView ↗
01/02/2026Certified Water and Sanitary-WS-Sanitary Piping-RoughingCertifiedView ↗
01/02/2026Certified Water and Sanitary-WS-Sanitary Piping-UndergroundCertifiedView ↗
12/18/2025Certified Water and Sanitary-WS-Sanitary Piping-RoughingCertifiedView ↗
▾Special Inspection Requirements (DOB NOW) — 13
DateRequirementInspectorRole
12/11/2025Tenant Protection Plan Compliance—special
12/11/2025Fire-Resistant Penetrations and JointsNING LUspecial
12/11/2025Energy Code Compliance InspectionsNING LUprogress
12/02/2025Fire-Resistant Penetrations and JointsNING LUspecial
12/02/2025Tenant Protection Plan Compliance—special
12/02/2025Energy Code Compliance InspectionsNING LUprogress
09/17/2025Fire-Resistance Rated ConstructionNING LUprogress
07/28/2025Interior lighting powerNING LUenergy_progress
07/28/2025Tenant Protection Plan ComplianceNING LUspecial
07/28/2025FinalNING LUprogress
07/28/2025Energy Code Compliance InspectionsNING LUprogress
07/28/2025Lighting controlsNING LUenergy_progress
07/28/2025Mechanical SystemsNING LUspecial
Nothing on file for this building.