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Primarily 2 family with 1 store or office
423 KNICKERBOCKER AVENUE
BROOKLYN · BIN 3074796
💬 Discuss this project
1931Year Built
3Stories
S2Building Class
C4-3Zoning
5,200 sfGross Floor Area
3Units
6 Open Violations ▸FDNY Report ↗
Primarily 2 family with 1 store or office · Owner of record: 423 KNICKERBOCKER LLC · 2,500 sf lot · 2.08 FAR built · Flood zone X
Locations of Work
PlumbingCivil
Floor 32p · 1 filing · 16 docs
Floor 21p · 1 filing · 16 docs
Floor 1
▾Owner History (Filing Record)
Companies and organizations named on filings. Individual owners are not shown.
OwnerFilingsMost Recent
6 MURRAY1407/08/2026
423 KNICKERBOCKER LLC203/22/2026
TRAN GROUP203/21/2026
423 KNICKERBOCK303/21/2026
▾Design Consultants (Architect / Engineer of Record)
FirmFilingsMost Recent
ARQUITECTURA VARELA903/20/2025
GREEN DESIGN406/23/2022
▾Contractors (License-Anchored)
FirmTradeRolesMost Recent
JOHN FITZGERALD PLBG &HTGPlumbing407/08/2026
JOHN FITZGERALD PLBG HTGGeneral Contractor303/22/2026
ALJER PLBG & HTG CORPPlumbing207/08/2026
▾Special Inspection Agencies
AgencyLicense #FilingsMost Recent
BUTTERFIELD & O'CONNOR41891303/20/2025
Building Lifecycle
All (56)Filed (13)Permit Issued (5)Violation (10)Inspection (6)Objection (4)Special Inspection (18)
03/26/2025
Inspection — Pass-Final Boiler Equipment Inspection
Pass
View inspection ↗
03/21/2025
Special inspection requirement — Fire-Resistant Penetrations and Joints
BRIAN T. O'CONNOR
03/21/2025
Special inspection requirement — Heating Systems
BRIAN T. O'CONNOR
03/21/2025
Special inspection requirement — Fire-Resistant Penetrations and Joints
BRIAN T. O'CONNOR
03/21/2025
Special inspection requirement — Heating Systems
BRIAN T. O'CONNOR
03/20/2025
Filed — Alteration
B00734604-P6
03/20/2025
Filed — Alteration
HEREWITH FILING FOR ONE TANKLESS-BOILERS AS PER PLANS
B00904035-P3
02/13/2025
Special inspection requirement — Heating Systems
BRIAN T. O'CONNOR
02/13/2025
Special inspection requirement — Fire-Resistant Penetrations and Joints
BRIAN T. O'CONNOR
02/13/2025
Special inspection requirement — Heating Systems
BRIAN T. O'CONNOR
02/13/2025
Special inspection requirement — Fire-Resistant Penetrations and Joints
BRIAN T. O'CONNOR
11/15/2024
Permit issued — Boiler Equipment
B00904035-I1-BE
11/01/2024
Filed — Alteration
HEREWITH FILING FOR ONE TANKLESS-BOILERS AS PER PLANS
B00904035-P1
10/04/2024
Filed — Alteration
B00734604-P4
09/26/2024
Filed — Alteration
B00734604-P3
09/19/2024
Special inspection requirement — Heating Systems
BRIAN T. O'CONNOR
09/19/2024
Special inspection requirement — Fire-Resistant Penetrations and Joints
BRIAN T. O'CONNOR
09/16/2024
Permit issued — Plumbing
B00544299-I1-PL
09/12/2024
Permit issued — Boiler Equipment
B00734604-I1-BE
03/13/2024
Filed — Alteration
B00734604-P2
08/24/2023
Special inspection requirement — Heating Systems
BRIAN T. O'CONNOR
08/24/2023
Special inspection requirement — Fire-Resistant Penetrations and Joints
BRIAN T. O'CONNOR
07/20/2023
Filed — Alteration
HEREWITH FILING FOR ONE TANKLESS-BOILERS AS PER PLANS
B00904035-I1
02/16/2023
Filed — Alteration
B00734604-P1
02/03/2023
Special inspection requirement — Fire-Resistant Penetrations and Joints
BRIAN T. O'CONNOR
02/03/2023
Special inspection requirement — Heating Systems
BRIAN T. O'CONNOR
10/26/2022
Violation issued (ECB, open)
Plumbing
08/04/2022
Permit issued — Boiler Equipment
B00734604-I1-BE
07/26/2022
Filed — Alteration
B00734604-I1
07/13/2022
Special inspection requirement — Fire-Resistant Penetrations and Joints
BRIAN T. O'CONNOR
07/09/2022
Objection resolved — Addressed
06/28/2022
Objection raised — Scope
06/23/2022
Filed — Alteration
HEREWITH FILING FOR PLUMBING MODIFICATIONS AS PER PLANS. NO CHANGE OF USE, EGRESS OR OCCUPANCY THIS APPLICATION.
B00544299-P3
05/25/2022
Inspection — Pass-Final PL - Up to 9 Requested Floors
Pass
View inspection ↗
05/25/2022
Special inspection requirement — Fire-Resistant Penetrations and Joints
BRIAN T. O'CONNOR
05/14/2022
Inspection — Fail-Final PL - Up to 9 Requested Floors
Fail
View inspection ↗
04/22/2022
Inspection — Pass-Final PL - Up to 9 Requested Floors
Pass
View inspection ↗
02/28/2022
Objection resolved — Addressed
02/23/2022
Filed — Alteration
HEREWITH FILING FOR PLUMBING MODIFICATIONS AS PER PLANS. NO CHANGE OF USE, EGRESS OR OCCUPANCY THIS APPLICATION.
B00544299-P2
02/23/2022
Objection raised — Scope
02/23/2022
Special inspection requirement — Fire-Resistant Penetrations and Joints
BRIAN T. O'CONNOR
11/18/2021
Filed — Alteration
HEREWITH FILING FOR PLUMBING MODIFICATIONS AS PER PLANS. NO CHANGE OF USE, EGRESS OR OCCUPANCY THIS APPLICATION.
B00544299-P1
10/20/2021
Special inspection requirement — Fire-Resistant Penetrations and Joints
BRIAN T. O'CONNOR
09/09/2021
Inspection — Pass-Final PL - Up to 9 Requested Floors
Pass
View inspection ↗
08/31/2021
Inspection — Pass-Final PL - Up to 9 Requested Floors
Pass
View inspection ↗
07/27/2021
Permit issued — Plumbing
B00544299-I1-PL
07/02/2021
Filed — Alteration
HEREWITH FILING FOR PLUMBING MODIFICATIONS AS PER PLANS. NO CHANGE OF USE, EGRESS OR OCCUPANCY THIS APPLICATION.
B00544299-I1
05/04/2010
Violation issued (ECB, closed)
Construction
05/04/2010
Violation issued (ECB, closed)
Construction
12/31/2009
Violation issued (DOB, open)
V-DOB VIOLATION - ACTIVE
01/01/2009
Violation issued (DOB, open)
V-DOB VIOLATION - ACTIVE
01/13/2001
Violation issued (ECB, closed)
Boilers
09/16/1997
Violation issued (DOB, closed)
V*-DOB VIOLATION - DISMISSED
06/01/1994
Violation issued (DOB, open)
V-DOB VIOLATION - ACTIVE
08/16/1993
Violation issued (DOB, open)
V-DOB VIOLATION - ACTIVE
06/01/1993
Violation issued (DOB, open)
V-DOB VIOLATION - ACTIVE
Permit / Filing Register
SourceWork TypeStatusApplicantIssued
DOB NOWBoiler EquipmentSigned-offJOHN FITZGERALD PLBG &HTG11/15/2024
DOB NOWPlumbingSigned-offJOHN FITZGERALD PLBG &HTG09/16/2024
DOB NOWBoiler EquipmentSigned-offJOHN FITZGERALD PLBG &HTG09/12/2024
DOB NOWBoiler EquipmentSigned-offALJER PLBG & HTG CORP08/04/2022
DOB NOWPlumbingSigned-offALJER PLBG & HTG CORP07/27/2021
BISOTISSUEDGOLDEN SAW CONSTRUCTION C07/21/2021
BISPLISSUEDCAPE PLUMBING INC10/05/2010
BISEQISSUEDSANFORD K GENERAL CONSTR05/05/2009
BISEQISSUEDSANFORD K GENERAL CONSTR05/05/2009
BISOTISSUEDSANFORD K GENERAL CONSTR04/08/2009
BISEQISSUEDSANFORD K GENERAL CONSTR04/08/2009
BISOTISSUEDTIGER AIR CONDITIONING,INC.08/11/1992
1 project · most recent 06/23/2022
Gas Water/Sanitary
FiledStatusContractorScope
06/23/2022Signed-offJOHN FITZGERALD PLBG &HTGGas, Water/Sanitary
1 project · most recent 04/04/2022
General Wiring
FiledStatusContractorScope
04/04/2022Permit IssuedL J ELEC'L SERV. INC.General Wiring
▾Field Inspections (DOB CAP) — 6
DateTypeResultReport
03/26/2025Pass-Final Boiler Equipment InspectionPassView ↗
05/25/2022Pass-Final PL - Up to 9 Requested FloorsPassView ↗
05/14/2022Fail-Final PL - Up to 9 Requested FloorsFailView ↗
04/22/2022Pass-Final PL - Up to 9 Requested FloorsPassView ↗
09/09/2021Pass-Final PL - Up to 9 Requested FloorsPassView ↗
08/31/2021Pass-Final PL - Up to 9 Requested FloorsPassView ↗
▾Special Inspection Requirements (DOB NOW) — 18
DateRequirementInspectorRole
03/21/2025Fire-Resistant Penetrations and JointsBRIAN T. O'CONNORspecial
03/21/2025Heating SystemsBRIAN T. O'CONNORspecial
03/21/2025Fire-Resistant Penetrations and JointsBRIAN T. O'CONNORspecial
03/21/2025Heating SystemsBRIAN T. O'CONNORspecial
02/13/2025Heating SystemsBRIAN T. O'CONNORspecial
02/13/2025Fire-Resistant Penetrations and JointsBRIAN T. O'CONNORspecial
02/13/2025Heating SystemsBRIAN T. O'CONNORspecial
02/13/2025Fire-Resistant Penetrations and JointsBRIAN T. O'CONNORspecial
09/19/2024Heating SystemsBRIAN T. O'CONNORspecial
09/19/2024Fire-Resistant Penetrations and JointsBRIAN T. O'CONNORspecial
08/24/2023Heating SystemsBRIAN T. O'CONNORspecial
08/24/2023Fire-Resistant Penetrations and JointsBRIAN T. O'CONNORspecial
02/03/2023Fire-Resistant Penetrations and JointsBRIAN T. O'CONNORspecial
02/03/2023Heating SystemsBRIAN T. O'CONNORspecial
07/13/2022Fire-Resistant Penetrations and JointsBRIAN T. O'CONNORspecial
05/25/2022Fire-Resistant Penetrations and JointsBRIAN T. O'CONNORspecial
02/23/2022Fire-Resistant Penetrations and JointsBRIAN T. O'CONNORspecial
10/20/2021Fire-Resistant Penetrations and JointsBRIAN T. O'CONNORspecial
▾Documents — 112 on file (BIS + DOB NOW)
▸Plans & Drawings13
▸DOB NOWPlans/Sketch13
09/01/2026B00544299-P1Request digital key ↗
09/01/2026B00544299-I1Request digital key ↗
08/29/2026B00734604-P6Request digital key ↗
Showing 3 of 13 on file for this type
▸Applications & Permits15
▸BISWORK PERMIT APPLICATION8
06/04/2021340701388Open ↗
06/04/2021340701388Open ↗
10/29/2019340701388Open ↗
Showing 3 of 8 on file for this type
▸BISPLAN / WORK APPROVAL APPLICATION7
07/15/2021340701388Open ↗
07/06/2021340701388Open ↗
10/29/2019340701388Open ↗
Showing 3 of 7 on file for this type
▸Seals & Professional Certifications44
▸DOB NOWSpecial Inspector Seal & Signature18
09/13/2026B00904035-I1Open ↗
09/13/2026B00904035-I1Open ↗
09/02/2026B00734604-I1Open ↗
Showing 3 of 18 on file for this type
▸DOB NOWDPL-1: Design Professional Seal & Signature13
09/01/2026B00544299-P1Open ↗
09/01/2026B00544299-I1Open ↗
09/01/2026B00544299-P3Open ↗
Showing 3 of 13 on file for this type
▸BISPROFESSIONAL CERTIFIED CHECKLIST4
09/28/2010320220747Open ↗
05/08/2009320016950Open ↗
05/06/2009320016941Open ↗
Showing 3 of 4 on file for this type
▸BISPROFESSIONAL CERTIFICATION STATEMENT FORM4
09/28/2010320220747Open ↗
05/08/2009320016950Open ↗
05/06/2009320016941Open ↗
Showing 3 of 4 on file for this type
▸BISTECHNICAL REPORT: RESPONSIBILITY/CERTIFICATION2
09/28/2010320220747Open ↗
04/06/2009320003857Open ↗
▸BISREQUIRED ITEMS CHECKLIST FOR PROFESSIONAL CERTIFICATION1
10/29/2019340701388Open ↗
▸BISTECHNICAL REPORT STATEMENT OF RESPONSIBILITY1
10/29/2019340701388Open ↗
▸BISPROFESSIONAL CERTIFICATION STATEMENT1
10/29/2019340701388Open ↗
▸Trade Schedules & Equipment2
▸BISSCHEDULE B - PLUMBING2
09/28/2010320220747Open ↗
04/06/2009320003857Open ↗
▸Safety & Tenant Protection3
▸BISSTREET TREE CHECKLIST3
09/28/2010320220747Open ↗
05/08/2009320016950Open ↗
05/06/2009320016941Open ↗
▸Environmental & Asbestos18
▸DOB NOWDEP ACP-5: Asbestos Assessment Report13
09/01/2026B00544299-P1Open ↗
09/01/2026B00544299-I1Open ↗
08/29/2026B00734604-P6Open ↗
Showing 3 of 13 on file for this type
▸BISTHIS IS 'NOT AN ASBESTOS PROJECT'2
09/28/2010320220747Open ↗
04/06/2009320003857Open ↗
▸BISASBESTOS EXEMPTION CERTIFICATION LETTER2
05/08/2009320016950Open ↗
05/06/2009320016941Open ↗
▸BISASBESTOS: CERTIFICATION (DEP ACP5)1
10/29/2019340701388Open ↗
▸Energy Compliance2
▸BISTECHNICAL REPORT STATEMENT OF RESPONSIBILITY FOR ENERGY CODE PROGRESS INSPECTIONS1
10/29/2019340701388Open ↗
▸BISTECHNICAL REPORT: ENERGY CODE - RESPONSIBILITY1
10/29/2019340701388Open ↗
▸Inspections & Test Reports2
▸BISTECHNICAL REPORT: RESPONSIBILITY2
10/30/2019340701388Open ↗
10/29/2019340701388Open ↗
▸Approvals, Objections & Sign-offs4
▸BISADMINISTRATIVE OBJECTIONS4
09/28/2010320220747Open ↗
05/08/2009320016950Open ↗
05/06/2009320016941Open ↗
Showing 3 of 4 on file for this type
▸Cost, Insurance & Ownership3
▸BISCOST AFFIDAVIT3
10/29/2019340701388Open ↗
09/28/2010320220747Open ↗
04/06/2009320003857Open ↗
▸Filing & Intake Forms6
▸BISEFILING COVER SHEET4
09/28/2010320220747Open ↗
05/08/2009320016950Open ↗
05/06/2009320016941Open ↗
Showing 3 of 4 on file for this type
▸BISEFILING JOB APPLICATION COVER SHEET1
10/29/2019340701388Open ↗
▸BISADDITIONAL INFORMATION1
07/15/2021340701388Open ↗