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Three families
333 21 STREET
BROOKLYN · BIN 3017468
💬 Discuss this project
1899Year Built
3Stories
C0Building Class
R6BZoning
2,640 sfGross Floor Area
3Units
Rent Stabilized20 Open Violations 19 unresolved · 1 paperwork only ▸FDNY Report ↗
Three families · Owner of record: 333 21ST STREET LLC · 2,028 sf lot · 1.3 FAR built · Flood zone X
Locations of Work
ArchitectureStructuralPlumbingFire ProtectionCivil
Permit Issued — active, not yet Signed-off
PenthouseUnder Construction23p · 2 filings · 20 docs
Floor 3Under Construction23p · 2 filings · 20 docs
Floor 2Under Construction24p · 2 filings · 20 docs
Floor 1Under Construction23p · 2 filings · 20 docs
CellarUnder Construction24p · 2 filings · 20 docs
▾Owner History (Filing Record)
Companies and organizations named on filings. Individual owners are not shown.
OwnerFilingsMost Recent
INTERBORO PROPERTY MANAGEMENT3207/08/2026
333 21ST STREET LLC103/22/2026
TO THE OWNER OF103/22/2026
▾Sales History (ACRIS)
DatePriceUnitSeller → Buyer$/sf
01/05/2023$1.8M—— → —$672/sf building
▾Design Consultants (Architect / Engineer of Record)
FirmFilingsMost Recent
PROJECT TACTICAL SOLUTIONS, LLC403/25/2026
MOROZOV103/03/2026
A & T ENGINEERING, P.C.212/22/2023
▾Filing Representatives (Expediters)
RepresentativeFilingsMost Recent
QUICK FILING OF NY INC303/21/2026
▾Contractors (License-Anchored)
FirmTradeRolesMost Recent
INTERBORO PROPERTY MGMTGeneral Contractor1507/08/2026
AMC PLBG, HTG & CLNG, INCPlumbing307/08/2026
PLUMBING NYC INCPlumbing106/27/2026
▾Special Inspection Agencies
AgencyLicense #FilingsMost Recent
ALTERA ENGINEERING2646103/03/2026
A & T DESIGN GROUP LLC1088312/22/2023
Building Lifecycle
All (101)Filed (7)Permit Issued (16)Violation (29)Inspection (1)Objection (30)Special Inspection (18)
06/30/2026
Inspection — Certified Water and Sanitary-WS-Sanitary Piping-Underground
Certified
View inspection ↗
06/23/2026
Permit issued — Plumbing
B87317668-S3-PL
06/05/2026
Permit issued — General Construction
B00887998-I1-GC
05/01/2026
Violation issued (HPD, open)
A
04/21/2026
Permit issued — Foundation
B00887998-S2-FO
04/15/2026
Permit issued — Structural
B00887998-S1-ST
03/25/2026
Filed — Alteration CO
PROPOSED FOUNDATION AND EXCAVATION WORK TYPE FOR HORIZONTAL & VERTICAL EXTENSION TO ESTABLISH A 3-STORY BUILDING W/ PENHOUSE & BASEMENT, IN CONJUNCTION WITH ALT-CO APPLICATION NUMBER B00887998-I1
B00887998-S6
03/25/2026
Special inspection requirement — HVAC-R and service water piping design and insulation
03/25/2026
Special inspection requirement — HVAC-R and service water heating equipment
03/25/2026
Special inspection requirement — HVAC-R and service water heating system controls
03/24/2026
Special inspection requirement — Mechanical Systems
03/24/2026
Special inspection requirement — Final
03/11/2026
Permit issued — Plumbing
B00887998-S3-PL
03/10/2026
Permit issued — Construction Fence
B00996593-I1-FN
03/03/2026
Filed — Alteration CO
PROPOSED FOUNDATION AND EXCAVATION WORK TYPE FOR HORIZONTAL & VERTICAL EXTENSION TO ESTABLISH A 3-STORY BUILDING W/ PENHOUSE & BASEMENT, IN CONJUNCTION WITH ALT-CO APPLICATION NUMBER B00887998-I1
B00887998-S5
11/19/2025
Violation issued (HPD, open)
I
09/03/2025
Permit issued — General Construction
B00887998-I1-GC
06/06/2025
Violation issued (HPD, open)
A
04/25/2025
Permit issued — Earth Work
B00887998-S2-FO
04/17/2025
Permit issued — Structural
B00887998-S1-ST
03/26/2025
Permit issued — Construction Fence
B00996593-I1-FN
11/26/2024
Violation issued (HPD, open)
I
09/19/2024
Permit issued — Plumbing
B00887998-S3-PL
09/18/2024
Permit issued — General Construction
B00887998-I1-GC
05/03/2024
Permit issued — Foundation
B00887998-S2-FO
04/16/2024
Permit issued — Structural
B00887998-S1-ST
04/03/2024
Violation issued (HPD, open)
A
01/29/2024
Filed — Alteration
B00996593-I1
01/26/2024
Objection resolved — Addressed
01/16/2024
Objection resolved — Addressed
01/15/2024
Objection resolved — Addressed
01/03/2024
Objection resolved — Addressed
01/03/2024
Objection resolved — Addressed
01/03/2024
Objection resolved — Addressed
01/02/2024
Objection raised — Admin
01/02/2024
Objection raised — Admin
01/02/2024
Objection raised — Admin
01/02/2024
Objection raised — Fire_Protection
01/02/2024
Objection raised — Inspections
01/02/2024
Objection resolved — Addressed
01/02/2024
Objection raised — Admin
01/02/2024
Objection raised — Structural
01/02/2024
Objection resolved — Addressed
01/02/2024
Objection raised — Structural
01/02/2024
Objection resolved — Addressed
01/02/2024
Objection raised — Other
01/02/2024
Objection raised — Structural
01/02/2024
Objection resolved — Addressed
12/22/2023
Filed — Alteration CO
PROPOSED FOUNDATION AND EXCAVATION WORK TYPE FOR HORIZONTAL & VERTICAL EXTENSION TO ESTABLISH A 3-STORY BUILDING W/ PENHOUSE & BASEMENT, IN CONJUNCTION WITH ALT-CO APPLICATION NUMBER B00887998-I1
B00887998-S1
12/22/2023
Filed — Alteration CO
PROPOSED FOUNDATION AND EXCAVATION WORK TYPE FOR HORIZONTAL & VERTICAL EXTENSION TO ESTABLISH A 3-STORY BUILDING W/ PENHOUSE & BASEMENT, IN CONJUNCTION WITH ALT-CO APPLICATION NUMBER B00887998-I1
B00887998-S2
12/20/2023
Permit issued — Plumbing
B00887998-S3-PL
12/11/2023
Filed — Alteration CO
PROPOSED FOUNDATION AND EXCAVATION WORK TYPE FOR HORIZONTAL & VERTICAL EXTENSION TO ESTABLISH A 3-STORY BUILDING W/ PENHOUSE & BASEMENT, IN CONJUNCTION WITH ALT-CO APPLICATION NUMBER B00887998-I1
B00887998-S3
12/01/2023
Special inspection requirement — Final
ROBERT LIN
12/01/2023
Special inspection requirement — Masonry
ROBERT LIN
12/01/2023
Special inspection requirement — Structural Cold-Formed Steel
ROBERT LIN
12/01/2023
Special inspection requirement — Structural Steel - Details
ROBERT LIN
12/01/2023
Special inspection requirement — Structural Steel - High Strength Bolting
ROBERT LIN
12/01/2023
Special inspection requirement — Structural Steel - Welding
ROBERT LIN
11/20/2023
Violation issued (HPD, open)
I
11/13/2023
Permit issued — General Construction
B00887998-I1-GC
Latest 60 of 101 events.
Permit / Filing Register
SourceWork TypeStatusApplicantIssued
DOB NOWPlumbingPermit IssuedPLUMBING NYC INC06/23/2026
DOB NOWGeneral ConstructionPermit IssuedINTERBORO PROPERTY MGMT06/05/2026
DOB NOWFoundationPermit IssuedINTERBORO PROPERTY MGMT04/21/2026
DOB NOWStructuralPermit IssuedINTERBORO PROPERTY MGMT04/15/2026
DOB NOWPlumbingPermit IssuedAMC PLBG, HTG & CLNG, INC03/11/2026
DOB NOWConstruction FencePermit IssuedINTERBORO PROPERTY MGMT03/10/2026
DOB NOWGeneral ConstructionPermit IssuedINTERBORO PROPERTY MGMT09/03/2025
DOB NOWEarth WorkPermit IssuedINTERBORO PROPERTY MGMT04/25/2025
DOB NOWStructuralPermit IssuedINTERBORO PROPERTY MGMT04/17/2025
DOB NOWConstruction FencePermit IssuedINTERBORO PROPERTY MGMT03/26/2025
DOB NOWPlumbingPermit IssuedAMC PLBG, HTG & CLNG, INC09/19/2024
DOB NOWGeneral ConstructionPermit IssuedINTERBORO PROPERTY MGMT09/18/2024
DOB NOWFoundationPermit IssuedINTERBORO PROPERTY MGMT05/03/2024
DOB NOWStructuralPermit IssuedINTERBORO PROPERTY MGMT04/16/2024
DOB NOWPlumbingPermit IssuedAMC PLBG, HTG & CLNG, INC12/20/2023
DOB NOWGeneral ConstructionPermit IssuedINTERBORO PROPERTY MGMT11/13/2023
1 job · most recent 03/25/2026
Heating and Air Conditioning Systems
FiledStatusContractorScopeMake / Model / Capacity
03/25/2026Permit IssuedINTERBORO PROPERTY MGMTHeating and Air Conditioning Systems
Heat / Cool
Mitsubishi Electric Mitsubishi MXZ-SM48NLHZ 54,000 BTU · Vrf Outdoor ×2
Mitsubishi MXZ-SM36NLHZ 42,000 BTU · Vrf Outdoor ×1
1 job · most recent 03/25/2026
Sprinkler System
FiledStatusContractorScope
03/25/2026——Sprinkler System
1 job · most recent 03/25/2026
Gas Water/Sanitary
FiledStatusContractorScope
03/25/2026Permit IssuedAMC PLBG, HTG & CLNG, INCGas, Water/Sanitary
1 job · most recent 02/09/2024
General Wiring
FiledStatusContractorScope
02/09/2024Permit IssuedRIGID ELECTRIC, INC.General Wiring
1 job · most recent 03/25/2026
Steel Masonry Wood
FiledStatusContractorScope
03/25/2026Permit IssuedINTERBORO PROPERTY MGMTSteel, Masonry, Wood
▾Field Inspections (DOB CAP) — 1
DateTypeResultReport
06/30/2026Certified Water and Sanitary-WS-Sanitary Piping-UndergroundCertifiedView ↗
▾Special Inspection Requirements (DOB NOW) — 18
DateRequirementInspectorRole
03/25/2026HVAC-R and service water piping design and insulation—energy_progress
03/25/2026HVAC-R and service water heating equipment—energy_progress
03/25/2026HVAC-R and service water heating system controls—energy_progress
03/24/2026Mechanical Systems—special
03/24/2026Final—progress
12/01/2023FinalROBERT LINprogress
12/01/2023MasonryROBERT LINspecial
12/01/2023Structural Cold-Formed SteelROBERT LINspecial
12/01/2023Structural Steel - DetailsROBERT LINspecial
12/01/2023Structural Steel - High Strength BoltingROBERT LINspecial
12/01/2023Structural Steel - WeldingROBERT LINspecial
10/06/2023Fire-Resistance Rated ConstructionROBERT LINprogress
10/06/2023Fire-Resistant Penetrations and JointsROBERT LINspecial
10/06/2023Lighting controlsROBERT LINenergy_progress
10/06/2023Fenestration air leakageROBERT LINenergy_progress
10/06/2023Interior lighting powerROBERT LINenergy_progress
10/06/2023Lighting in dwelling unitsROBERT LINenergy_progress
10/06/2023Fenestration and door U-factor and product ratingsROBERT LINenergy_progress
▾Documents — 36 on file (BIS + DOB NOW)
▸Plans & Drawings7
▸DOB NOWPlans/Sketch7
08/26/2026B00996593-I1Request digital key ↗
08/17/2026B00887998-S6Request digital key ↗
08/17/2026B00887998-S5Request digital key ↗
Showing 3 of 7 on file for this type
▸Zoning, Tax Lot & Property Records1
▸DOB NOWZD1: DOB Zoning Diagram1
08/13/2026B00887998-I1Open ↗
▸Seals & Professional Certifications12
▸DOB NOWDPL-1: Design Professional Seal & Signature7
08/26/2026B00996593-I1Open ↗
08/17/2026B00887998-S5Open ↗
08/17/2026B00887998-S3Open ↗
Showing 3 of 7 on file for this type
▸DOB NOWProgress Inspector Seal & Signature3
08/25/2026B00887998-S1Open ↗
08/24/2026B00887998-I1Open ↗
08/24/2026B00887998-I1Open ↗
▸DOB NOWSpecial Inspector Seal & Signature2
08/25/2026B00887998-S1Open ↗
08/24/2026B00887998-I1Open ↗
▸Trade Schedules & Equipment1
▸DOB NOWDEP: Sewer Certification (Sanitary/Storm)1
08/13/2026B00887998-I1Open ↗
▸Safety & Tenant Protection1
▸DOB NOWStreet Tree Checklist1
08/13/2026B00887998-I1Open ↗
▸Environmental & Asbestos6
▸DOB NOWDEP ACP-5: Asbestos Assessment Report6
08/17/2026B00887998-S3Open ↗
08/17/2026B00887998-S5Open ↗
08/17/2026B00887998-S6Open ↗
Showing 3 of 6 on file for this type
▸Inspections & Test Reports2
▸DOB NOWTR4 Test Report and Plot Diagram1
08/13/2026B00887998-S2Open ↗
▸DOB NOWSOIL REPORT1
08/13/2026B00887998-S2Open ↗
▸Other Documents6
▸DOB NOWPlot Diagram2
08/13/2026B00887998-I1Open ↗
08/13/2026B00887998-S2Open ↗
▸DOB NOWProperty Ownership Certification1
08/17/2026B00887998-I1Open ↗
▸DOB NOWLocal Law 92/94 of 2019 Sustainable Roof Zone1
08/13/2026B00887998-I1Open ↗
▸DOB NOWSite Survey: Initial1
08/13/2026B00887998-I1Open ↗
▸DOB NOWAdjoining Owners Notification1
08/13/2026B00887998-S2Open ↗