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Two family converted from one family
371 HAWTHORNE STREET
BROOKLYN · Prospect Lefferts Gardens-Wingate · BIN 3107291
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1899Year Built
2Stories
B3Building Class
R6Zoning
1,640 sfGross Floor Area
2Units
3 Open Violations 1 unresolved · 2 paperwork only ▸FDNY Report ↗
Two family converted from one family · Owner of record: HSK 371 HAWTHORNE LLC · 3,297 sf lot · 0.5 FAR built · Flood zone X
Locations of Work
ArchitectureStructuralElectricalMechanicalPlumbingFire ProtectionEquipmentGeneral
Permit Issued — active, not yet Signed-off
RoofUnder Construction41p · 2 filings · 20 docs
PenthouseUnder Construction39p · 2 filings · 20 docs
Floor 512p · 1 filing · 10 docs
Floor 4Under Construction51p · 3 filings · 20 docs
Floor 3Under Construction50p · 3 filings · 20 docs
Floor 2Under Construction42p · 3 filings · 20 docs
Floor 1Under Construction51p · 3 filings · 20 docs
CellarUnder Construction57p · 4 filings · 20 docs
Site & exterior9p · 2 filings · 6 docs
Filed — no permit issued25p · 2 filings · 8 docs
▾Owner History (Filing Record)
Companies and organizations named on filings. Individual owners are not shown.
OwnerFilingsMost Recent
HSK MANAGEMENT6209/13/2026
HIGHLINE DEVELOPERS BKLYN LLC203/21/2026
BL REALTY103/21/2026
▾Sales History (ACRIS)
DatePriceUnitSeller → Buyer$/sf
01/20/2021$950K—— → —$579/sf building
▾Design Consultants (Architect / Engineer of Record)
FirmFilingsMost Recent
NIKOLAI KATZ ARCHITECT605/18/2026
SIERRA CONSTRUCTION101/21/2026
ASHRAF CORP112/11/2025
AL FFRED ARCHITECTURE PLLC806/25/2025
BGM ENGINEERING410/10/2023
ASHER ARCHITECT108/08/2022
▾Filing Representatives (Expediters)
RepresentativeFilingsMost Recent
EMPIRE EXPEDITING2403/21/2026
NYC PERMIT SERVICES203/21/2026
NY DOB PERMITS203/21/2026
REDCUT EXPEDITING403/21/2026
▾Contractors (License-Anchored)
FirmTradeRolesMost Recent
ACE MAINTENANCE USA LLCGeneral Contractor1907/08/2026
HSK MANAGEMENT INCGeneral Contractor607/08/2026
AMERICAN POWER ELECT CONSElectrical103/22/2026
ARCO PLBG AND HTG INCPlumbing107/08/2026
BT'S PLUMBING AND HEATINGPlumbing107/08/2026
KISHAN PLUMBING INCPlumbing107/08/2026
▾Special Inspection Agencies
AgencyLicense #FilingsMost Recent
BGM ENGINEERING, LLC15141205/18/2026
AA BUILDING & INSPECTION1519101/21/2026
Building Lifecycle
All (198)Filed (21)Permit Issued (22)Signed Off (7)Violation (25)Inspection (10)Objection (80)Special Inspection (30)Tax Incentive (3)
07/21/2026
Inspection — Pass-Final CND-Occupancy Inspection
Pass
View inspection ↗
05/18/2026
Filed — ALT-CO - New Building with Existing Elements to Remain
PROPOSED CONVERSION TO AN EXISTING 2 STORY AND CELLARRESIDENTIAL BUILDING. WITH HORIZONTAL AND VERTICAL ENLARGEMENT EXISTING 2 UNITS PROPOSED TOTAL OF 10 RESIDENTIAL UNITS.
B00803340-P9
05/18/2026
Special inspection requirement — Lighting controls
RAUL VELASQUEZ MARTINEZ
05/18/2026
Special inspection requirement — Metering
RAUL VELASQUEZ MARTINEZ
05/18/2026
Special inspection requirement — Fenestration and door U-factor and product ratings
RAUL VELASQUEZ MARTINEZ
05/18/2026
Special inspection requirement — Insulation placement and R values
RAUL VELASQUEZ MARTINEZ
05/18/2026
Special inspection requirement — Exterior Insulation and Finish Systems (EIFS)
RAUL VELASQUEZ MARTINEZ
05/18/2026
Special inspection requirement — Energy Code Compliance Inspections
RAUL VELASQUEZ MARTINEZ
05/18/2026
Special inspection requirement — Air barrier — testing
RAUL VELASQUEZ MARTINEZ
05/18/2026
Special inspection requirement — Exterior lighting power
RAUL VELASQUEZ MARTINEZ
05/18/2026
Special inspection requirement — Fenestration areas
RAUL VELASQUEZ MARTINEZ
05/18/2026
Special inspection requirement — Lighting in dwelling units
RAUL VELASQUEZ MARTINEZ
05/18/2026
Special inspection requirement — Protection of exposed foundation insulation
RAUL VELASQUEZ MARTINEZ
05/18/2026
Special inspection requirement — Fenestration air leakage
RAUL VELASQUEZ MARTINEZ
05/18/2026
Special inspection requirement — Fire-Resistant Penetrations and Joints
RAUL VELASQUEZ MARTINEZ
05/18/2026
Special inspection requirement — Air barrier continuity plan testing
RAUL VELASQUEZ MARTINEZ
05/18/2026
Special inspection requirement — Fire-Resistance Rated Construction
RAUL VELASQUEZ MARTINEZ
05/18/2026
Special inspection requirement — Air barrier - visual inspection
RAUL VELASQUEZ MARTINEZ
05/18/2026
Special inspection requirement — Interior lighting power
RAUL VELASQUEZ MARTINEZ
05/12/2026
Inspection — Certified Water and Sanitary-WS-Sanitary Piping-Roughing
Certified
View inspection ↗
05/07/2026
Inspection — Pass-Final CND-Occupancy Inspection
Pass
View inspection ↗
04/17/2026
Violation issued (ECB, open)
Construction
04/14/2026
Signed off — Alteration
Filing for the installation of pump jack scaffolds.
B01349100-I1
04/13/2026
Signed off — Alteration
INSTALLATION OF FULLY SPRINKLER SYSTEM AS REQUIRED PER APPLICATION. NO CHANGE IN USE, OCCUPANCY & EGRESS. RELATED ALT 1 APPLICATION B00803340-I1
B00674417-I1
03/27/2026
Objection raised — Cost
03/27/2026
Objection resolved — Addressed
03/27/2026
Objection resolved — Addressed
03/13/2026
Signed off — ALT-CO - New Building with Existing Elements to Remain
PROPOSED CONVERSION TO AN EXISTING 2 STORY AND CELLARRESIDENTIAL BUILDING. WITH HORIZONTAL AND VERTICAL ENLARGEMENT EXISTING 2 UNITS PROPOSED TOTAL OF 10 RESIDENTIAL UNITS.
B00803340-S2
03/11/2026
Violation issued (ECB, closed)
Construction
03/11/2026
Inspection — Certified Sprinkler-SP-Fixtures-Finish
Certified
View inspection ↗
03/10/2026
Permit issued — General Construction
B00803340-I1-GC
03/09/2026
Inspection — Certified Sprinkler-SP-Piping Dry/Wet-Hydrostatic Test
Certified
View inspection ↗
03/08/2026
Violation issued (ECB, open)
Construction
03/05/2026
Permit issued — Supported Scaffold
B01349100-I1-SF
03/02/2026
Permit issued — Sprinklers
B00674417-I1-EW-SP
02/24/2026
Objection resolved — Addressed
02/24/2026
Objection resolved — Addressed
02/24/2026
Objection resolved — Addressed
02/24/2026
Objection resolved — Addressed
02/24/2026
Objection resolved — Addressed
02/24/2026
Objection resolved — Addressed
02/12/2026
Objection raised — Scope
02/12/2026
Objection raised — Zoning
02/12/2026
Objection raised — Scope
02/12/2026
Objection raised — Scope
02/12/2026
Objection raised — Scope
02/12/2026
Objection raised — Scope
02/11/2026
Objection raised — Zoning
02/09/2026
Filed — ALT-CO - New Building with Existing Elements to Remain
PROPOSED CONVERSION TO AN EXISTING 2 STORY AND CELLARRESIDENTIAL BUILDING. WITH HORIZONTAL AND VERTICAL ENLARGEMENT EXISTING 2 UNITS PROPOSED TOTAL OF 10 RESIDENTIAL UNITS.
B00803340-P8
02/09/2026
Objection resolved — Addressed
02/06/2026
Signed off — Alteration
INSTALLATION OF CONSTRUCTION FENCE AROUND THE PROPERTY.
B00637434-I1
02/06/2026
Objection raised — Other
02/06/2026
Special inspection requirement — Lighting in dwelling units
RAUL VELASQUEZ MARTINEZ
02/06/2026
Special inspection requirement — Fire-Resistance Rated Construction
RAUL VELASQUEZ MARTINEZ
02/06/2026
Special inspection requirement — Energy Code Compliance Inspections
RAUL VELASQUEZ MARTINEZ
02/06/2026
Special inspection requirement — Exterior Insulation and Finish Systems (EIFS)
RAUL VELASQUEZ MARTINEZ
02/06/2026
Special inspection requirement — Fenestration air leakage
RAUL VELASQUEZ MARTINEZ
02/06/2026
Special inspection requirement — Fenestration areas
RAUL VELASQUEZ MARTINEZ
02/06/2026
Special inspection requirement — Fenestration and door U-factor and product ratings
RAUL VELASQUEZ MARTINEZ
02/06/2026
Special inspection requirement — Air barrier — testing
RAUL VELASQUEZ MARTINEZ
Latest 60 of 198 events.
Permit / Filing Register
SourceWork TypeStatusApplicantIssued
DOB NOWGeneral ConstructionPermit IssuedACE MAINTENANCE USA LLC03/10/2026
DOB NOWSupported ScaffoldSigned-offACE MAINTENANCE USA LLC03/05/2026
DOB NOWSprinklersSigned-offARCO PLBG AND HTG INC03/02/2026
DOB NOWPlumbingSigned-offN AND S PLUMBING INC12/05/2025
DOB NOWGeneral ConstructionPermit IssuedACE MAINTENANCE USA LLC10/03/2025
DOB NOWStructuralSigned-offACE MAINTENANCE USA LLC09/26/2025
DOB NOWMechanical SystemsSigned-offACE MAINTENANCE USA LLC09/25/2025
DOB NOWPlumbingSigned-offBT'S PLUMBING AND HEATING09/16/2025
DOB NOWGeneral ConstructionPermit IssuedACE MAINTENANCE USA LLC05/22/2025
DOB NOWConstruction FenceSigned-offACE MAINTENANCE USA LLC05/22/2025
DOB NOWMechanical SystemsSigned-offACE MAINTENANCE USA LLC09/04/2024
DOB NOWGeneral ConstructionPermit IssuedACE MAINTENANCE USA LLC08/09/2024
DOB NOWFoundationSigned-offACE MAINTENANCE USA LLC04/18/2024
DOB NOWConstruction FenceSigned-offACE MAINTENANCE USA LLC04/18/2024
DOB NOWGeneral ConstructionPermit IssuedACE MAINTENANCE USA LLC04/17/2024
DOB NOWStructuralSigned-offACE MAINTENANCE USA LLC04/16/2024
DOB NOWStructuralSigned-offHSK MANAGEMENT INC06/26/2023
DOB NOWConstruction FenceSigned-offHSK MANAGEMENT INC05/11/2023
DOB NOWStructuralSigned-offHSK MANAGEMENT INC06/28/2022
DOB NOWConstruction FenceSigned-offHSK MANAGEMENT INC01/06/2022
DOB NOWFoundationSigned-offHSK MANAGEMENT INC12/28/2021
DOB NOWStructuralSigned-offHSK MANAGEMENT INC12/28/2021
1 project · most recent 05/18/2026
Heating and Air Conditioning Systems
FiledStatusContractorScopeMake / Model / Capacity
05/18/2026Permit IssuedACE MAINTENANCE USA LLCHeating and Air Conditioning Systems
Heat / Cool
Samsung AC024DNHDCG/AA 25,530 BTU · Vrf Indoor ×6
AC024DXADCG/AA 25,530 BTU · Vrf Indoor ×5
AM018ANHDCH/AA 17,840 BTU · Vrf Indoor ×2
AM048TXMDCH/AA 41,493 BTU · Vrf Outdoor ×2
AM012TNVDCH/AA 11,840 BTU · Vrf Indoor ×1
AM018TNVDCH/AA 17,840 BTU · Vrf Indoor ×1
AM024ANHDCH/AA 23,653 BTU · Vrf Indoor ×1
AM036TXMDCH/AA 29,680 BTU · Vrf Outdoor ×1
1 project · most recent 05/18/2026
Storm Water/Sanitary
FiledStatusContractorScope
05/18/2026Signed-offKISHAN PLUMBING INCStorm, Water/Sanitary
1 project · most recent 04/15/2026
General Wiring
FiledStatusContractorScope
04/15/2026CompleteAMERICAN POWER ELECT CONSGeneral Wiring
▾Field Inspections (DOB CAP) — 10
DateTypeResultReport
07/21/2026Pass-Final CND-Occupancy InspectionPassView ↗
05/12/2026Certified Water and Sanitary-WS-Sanitary Piping-RoughingCertifiedView ↗
05/07/2026Pass-Final CND-Occupancy InspectionPassView ↗
03/11/2026Certified Sprinkler-SP-Fixtures-FinishCertifiedView ↗
03/09/2026Certified Sprinkler-SP-Piping Dry/Wet-Hydrostatic TestCertifiedView ↗
01/29/2026Pass-Final PL - Up to 9 Requested FloorsPassView ↗
12/19/2025Certified Water and Sanitary-WS-Sanitary Piping-UndergroundCertifiedView ↗
12/17/2025Certified Storm Drainage-ST-Fixtures-FinishCertifiedView ↗
12/17/2025Certified Water and Sanitary-WS-Fixtures-FinishCertifiedView ↗
10/08/2025Pass-Final PL - Up to 9 Requested FloorsPassView ↗
▾Special Inspection Requirements (DOB NOW) — 131
DateRequirementInspectorRole
05/18/2026Fenestration and door U-factor and product ratingsRAUL VELASQUEZ MARTINEZenergy_progress
05/18/2026Exterior Insulation and Finish Systems (EIFS)RAUL VELASQUEZ MARTINEZspecial
05/18/2026Fire-Resistant Penetrations and JointsRAUL VELASQUEZ MARTINEZspecial
05/18/2026Energy Code Compliance InspectionsRAUL VELASQUEZ MARTINEZprogress
05/18/2026Fire-Resistance Rated ConstructionRAUL VELASQUEZ MARTINEZprogress
05/18/2026Fenestration air leakageRAUL VELASQUEZ MARTINEZenergy_progress
05/18/2026Insulation placement and R valuesRAUL VELASQUEZ MARTINEZenergy_progress
05/18/2026Lighting controlsRAUL VELASQUEZ MARTINEZenergy_progress
05/18/2026Air barrier continuity plan testingRAUL VELASQUEZ MARTINEZenergy_progress
05/18/2026Lighting in dwelling unitsRAUL VELASQUEZ MARTINEZenergy_progress
05/18/2026Fenestration areasRAUL VELASQUEZ MARTINEZenergy_progress
05/18/2026Air barrier - visual inspectionRAUL VELASQUEZ MARTINEZenergy_progress
05/18/2026Protection of exposed foundation insulationRAUL VELASQUEZ MARTINEZenergy_progress
05/18/2026Air barrier — testing RAUL VELASQUEZ MARTINEZenergy_progress
05/18/2026Interior lighting powerRAUL VELASQUEZ MARTINEZenergy_progress
05/18/2026MeteringRAUL VELASQUEZ MARTINEZenergy_progress
05/18/2026Exterior lighting powerRAUL VELASQUEZ MARTINEZenergy_progress
02/06/2026MeteringRAUL VELASQUEZ MARTINEZenergy_progress
02/06/2026Exterior Insulation and Finish Systems (EIFS)RAUL VELASQUEZ MARTINEZspecial
02/06/2026Fire-Resistant Penetrations and JointsRAUL VELASQUEZ MARTINEZspecial
02/06/2026Energy Code Compliance InspectionsRAUL VELASQUEZ MARTINEZprogress
02/06/2026Fire-Resistance Rated ConstructionRAUL VELASQUEZ MARTINEZprogress
02/06/2026Lighting in dwelling unitsRAUL VELASQUEZ MARTINEZenergy_progress
02/06/2026Interior lighting powerRAUL VELASQUEZ MARTINEZenergy_progress
02/06/2026Protection of exposed foundation insulationRAUL VELASQUEZ MARTINEZenergy_progress
Latest 25 of 131.
▾Documents — 156 on file (BIS + DOB NOW)
▸Plans & Drawings21
▸DOB NOWPlans/Sketch21
08/31/2026B00637434-I1Request digital key ↗
08/31/2026B00650973-I1Request digital key ↗
08/31/2026B00650973-P1Request digital key ↗
Showing 3 of 21 on file for this type
▸Applications & Permits6
▸BISPLAN / WORK APPROVAL APPLICATION4
05/29/2025340904203Open ↗
05/21/2025340904203Open ↗
11/15/2023340904203Open ↗
Showing 3 of 4 on file for this type
▸BISBPP-5 - Authorization to the Department of Transportation2
02/18/2026340904203Open ↗
11/15/2023340904203Open ↗
▸Zoning, Tax Lot & Property Records14
▸DOB NOWZD1: DOB Zoning Diagram7
08/17/2026B00803340-P9Open ↗
08/17/2026B00803340-P6Open ↗
08/15/2026B00803340-P8Open ↗
Showing 3 of 7 on file for this type
▸DOB NOWZoning Exhibit form (1-5)6
08/17/2026B00803340-P9Open ↗
08/17/2026B00803340-P6Open ↗
08/15/2026B00803340-P8Open ↗
Showing 3 of 6 on file for this type
▸DOB NOWHouse Number Verification: TOPO Stamp1
08/15/2026B00803340-I1Open ↗
▸Seals & Professional Certifications63
▸DOB NOWProgress Inspector Seal & Signature25
09/28/2026B00650973-I1Open ↗
09/19/2026B00803340-P9Open ↗
09/19/2026B00803340-P9Open ↗
Showing 3 of 25 on file for this type
▸DOB NOWDPL-1: Design Professional Seal & Signature21
08/31/2026B00637434-I1Open ↗
08/31/2026B00650973-I1Open ↗
08/31/2026B00650973-P1Open ↗
Showing 3 of 21 on file for this type
▸DOB NOWSpecial Inspector Seal & Signature15
09/19/2026B00803340-P9Open ↗
09/19/2026B00803340-P9Open ↗
09/02/2026B00803340-S1Open ↗
Showing 3 of 15 on file for this type
▸BISAPPLICANT OWNER SIGNATURE1
11/15/2023340904203Open ↗
▸BISTECHNICAL REPORT STATEMENT OF RESPONSIBILITY1
11/15/2023340904203Open ↗
▸Trade Schedules & Equipment7
▸DOB NOWDEP: Sewer Certification (Sanitary/Storm)7
08/17/2026B00803340-P9Open ↗
08/17/2026B00803340-P6Open ↗
08/15/2026B00803340-P8Open ↗
Showing 3 of 7 on file for this type
▸Safety & Tenant Protection5
▸BISBPP: STREET TREES SITE PLAN1
11/15/2023340904203Open ↗
▸BISSTREET TREE CHECKLIST1
11/15/2023340904203Open ↗
▸DOB NOWParks Department Acknowledgment Letter for Street Trees Plan1
08/15/2026B00803340-I1Open ↗
▸DOB NOWStreet Trees Site Plan1
08/15/2026B00803340-I1Open ↗
▸DOB NOWStreet Tree Sign Off1
08/15/2026B00803340-I1Open ↗
▸Environmental & Asbestos14
▸DOB NOWDEP ACP-5: Asbestos Assessment Report14
08/31/2026B00650973-I1Open ↗
08/31/2026B00650973-P1Open ↗
08/17/2026B00803340-P9Open ↗
Showing 3 of 14 on file for this type
▸Filing & Intake Forms1
▸BISEFILING JOB APPLICATION COVER SHEET1
11/15/2023340904203Open ↗
▸Other Documents25
▸DOB NOWProperty Ownership Certification7
08/28/2026B00677396-I1Open ↗
08/17/2026B00803340-P9Open ↗
08/17/2026B00803340-P6Open ↗
Showing 3 of 7 on file for this type
▸DOB NOWLocal Law 92/94 of 2019 Sustainable Roof Zone7
08/17/2026B00803340-P9Open ↗
08/17/2026B00803340-P6Open ↗
08/15/2026B00803340-P8Open ↗
Showing 3 of 7 on file for this type
▸DOB NOWSite Survey: Initial6
08/17/2026B00803340-P9Open ↗
08/17/2026B00803340-P6Open ↗
08/15/2026B00803340-P8Open ↗
Showing 3 of 6 on file for this type
▸BISBPP - SUPPORTING DOCUMENTATION2
02/18/2026340904203Open ↗
11/15/2023340904203Open ↗
▸DOB NOWPlot Diagram2
08/31/2026B00650973-I1Open ↗
08/31/2026B00650973-P1Open ↗
▸DOB NOWFinal Survey1
08/15/2026B00803340-I1Open ↗