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Two family converted from one family
612 HANCOCK STREET
BROOKLYN · BIN 3046148
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1899Year Built
3Stories
B3Building Class
R6BZoning
3,388 sfGross Floor Area
2Units
Rent Stabilized2 Open Violations ▸FDNY Report ↗
Two family converted from one family · 17,805 sf lot · 0.19 FAR built · Flood zone X
Locations of Work
ArchitectureMechanical
Floor 32p · 1 filing · 9 docs
Floor 22p · 1 filing · 9 docs
Floor 12p · 1 filing · 9 docs
Cellar2p · 1 filing · 9 docs
Basement2p · 1 filing · 10 docs
Sub-Basement2p · 1 filing · 9 docs
▾Owner History (Filing Record)
Companies and organizations named on filings. Individual owners are not shown.
OwnerFilingsMost Recent
CITY LINE PROPERTIES803/22/2026
▾Sales History (ACRIS)
DatePriceUnitSeller → Buyer$/sf
04/21/2023$2.5M—FIRST YII LLC → Private party$731/sf building
11/23/2021$1.2M—Private party → FIRST YII LLC$362/sf building
▾Design Consultants (Architect / Engineer of Record)
FirmFilingsMost Recent
HC ARCHITECT, PC201/03/2024
L & C ASSOCIATES510/24/2022
▾Filing Representatives (Expediters)
RepresentativeFilingsMost Recent
L&C ASSOCIATES503/21/2026
CH CORNERSTONE DESIGN203/21/2026
▾Contractors (License-Anchored)
FirmTradeRolesMost Recent
STELLAR INDUSTRIES INCGeneral Contractor303/21/2026
CJ HEATING & MECHANICAL CGeneral Contractor107/08/2026
ROCK E SMALL PLBG&HTG INCPlumbing107/08/2026
▾Special Inspection Agencies
AgencyLicense #FilingsMost Recent
BEYOND ARCH LLC3600201/03/2024
LAM AND CO CONSULTING LLC8065208/25/2022
Building Lifecycle
All (40)Filed (7)Permit Issued (3)Signed Off (2)Violation (3)Inspection (6)Special Inspection (19)
11/24/2025
Violation issued (HPD, open)
I
12/04/2024
Violation issued (HPD, open)
I
01/08/2024
Special inspection requirement — HVAC-R and service water heating system controls
Hackjong Choi
01/08/2024
Special inspection requirement — Ventilation and air distribution system
Hackjong Choi
01/08/2024
Special inspection requirement — Fire-Resistant Penetrations and Joints
Hackjong Choi
01/08/2024
Special inspection requirement — Mechanical Systems
Hackjong Choi
01/08/2024
Special inspection requirement — Final
Hackjong Choi
01/08/2024
Special inspection requirement — Maintenance information
Hackjong Choi
01/08/2024
Special inspection requirement — HVAC-R and service water heating equipment
Hackjong Choi
01/08/2024
Special inspection requirement — HVAC-R and service water piping design and insulation
Hackjong Choi
01/03/2024
Filed — Alteration
INSTALLATION OF HVAC ON 2 FAMILY RESIDENTIAL
B00944747-P2
11/08/2023
Permit issued — Mechanical Systems
B00944747-I1-MS
10/12/2023
Filed — Alteration
INSTALLATION OF HVAC ON 2 FAMILY RESIDENTIAL
B00944747-I1
04/18/2023
Signed off — Alteration
PLUMBING WORKS AT BASEMENT AS PER PLAN. NO CHANGE IN USE, MEASN OF EGRESS OR OCCUPANCY IN THIS APPLICATION.
B00626013-I1
10/25/2022
Special inspection requirement — HVAC-R and service water piping design and insulation
CHI WAI CHUNG
10/25/2022
Special inspection requirement — Energy Code Compliance Inspections
CHI WAI CHUNG
10/24/2022
Filed — Alteration
PLUMBING WORKS AT BASEMENT AS PER PLAN. NO CHANGE IN USE, MEASN OF EGRESS OR OCCUPANCY IN THIS APPLICATION.
B00626013-P2
10/24/2022
Special inspection requirement — Energy Code Compliance Inspections
CHI WAI CHUNG
10/24/2022
Special inspection requirement — HVAC-R and service water piping design and insulation
CHI WAI CHUNG
09/14/2022
Signed off — Alteration
INTERIOR RENOVATION WITH PARTITIONS AT BASEMENT AS PER PLAN. NO CHANGE IN USE, MEANS OF EGRESS OR OCCUPANCY IN THIS APPLICATION.
B00625989-I1
09/13/2022
Inspection — Pass-Final General Construction Non-Directive 14
Pass
View inspection ↗
09/09/2022
Inspection — Fail-Final General Construction Non-Directive 14
Fail
View inspection ↗
09/07/2022
Inspection — Fail-Final General Construction Non-Directive 14
Fail
View inspection ↗
08/25/2022
Filed — Alteration
PLUMBING WORKS AT BASEMENT AS PER PLAN. NO CHANGE IN USE, MEASN OF EGRESS OR OCCUPANCY IN THIS APPLICATION.
B00626013-P1
08/25/2022
Filed — Alteration
INTERIOR RENOVATION WITH PARTITIONS AT BASEMENT AS PER PLAN. NO CHANGE IN USE, MEANS OF EGRESS OR OCCUPANCY IN THIS APPLICATION.
B00625989-P1
08/25/2022
Special inspection requirement — Interior lighting power
CHI WAI CHUNG
08/25/2022
Special inspection requirement — Fenestration areas
CHI WAI CHUNG
08/25/2022
Special inspection requirement — Fire-Resistant Penetrations and Joints
CHI WAI CHUNG
08/25/2022
Special inspection requirement — Fenestration air leakage
CHI WAI CHUNG
08/25/2022
Special inspection requirement — Air barrier - visual inspection
CHI WAI CHUNG
08/25/2022
Special inspection requirement — Fenestration and door U-factor and product ratings
CHI WAI CHUNG
08/25/2022
Special inspection requirement — Energy Code Compliance Inspections
CHI WAI CHUNG
04/29/2022
Inspection — Certified Gas-Gas-Piping-Roughing
Certified
View inspection ↗
04/29/2022
Inspection — Certified Water and Sanitary-WS-Sanitary Piping-Roughing
Certified
View inspection ↗
04/29/2022
Inspection — Certified Water and Sanitary-WS-Sanitary Piping-Underground
Certified
View inspection ↗
03/01/2022
Permit issued — General Construction
B00625989-I1-GC
03/01/2022
Permit issued — Plumbing
B00626013-I1-PL
02/03/2022
Filed — Alteration
PLUMBING WORKS AT BASEMENT AS PER PLAN. NO CHANGE IN USE, MEASN OF EGRESS OR OCCUPANCY IN THIS APPLICATION.
B00626013-I1
02/03/2022
Filed — Alteration
INTERIOR RENOVATION WITH PARTITIONS AT BASEMENT AS PER PLAN. NO CHANGE IN USE, MEANS OF EGRESS OR OCCUPANCY IN THIS APPLICATION.
B00625989-I1
08/23/2004
Violation issued (HPD, closed)
B
Permit / Filing Register
SourceWork TypeStatusApplicantIssued
DOB NOWMechanical SystemsPermit IssuedCJ HEATING & MECHANICAL C11/08/2023
DOB NOWGeneral ConstructionSigned-offSTELLAR INDUSTRIES INC03/01/2022
DOB NOWPlumbingSigned-offROCK E SMALL PLBG&HTG INC03/01/2022
1 project · most recent 01/03/2024
Heating and Air Conditioning Systems
FiledStatusContractorScopeMake / Model / Capacity
01/03/2024Permit IssuedCJ HEATING & MECHANICAL CHeating and Air Conditioning Systems
Heat / Cool
Goodman GSX130241FA 24,000 BTU · Condensing Unit ×4
CAPF1824B6DB 24,000 BTU · Ahu ×2
CAPFA2418A6BA 24,000 BTU · Ahu ×2
CAPFA3626B6AA 36,000 BTU · Ahu ×2
GSX130361EH 36,000 BTU · Condensing Unit ×2
Cooper & Hunter CH-09MSPHWM-230VI 9,000 BTU · Ahu ×4
CH18MSPH230VO 18,000 BTU · Condensing Unit ×2
1 project · most recent 12/26/2022
General Wiring
FiledStatusContractorScope
12/26/2022CompleteK.A.B. ELECTRIC CORPGeneral Wiring
▾Field Inspections (DOB CAP) — 6
DateTypeResultReport
09/13/2022Pass-Final General Construction Non-Directive 14PassView ↗
09/09/2022Fail-Final General Construction Non-Directive 14FailView ↗
09/07/2022Fail-Final General Construction Non-Directive 14FailView ↗
04/29/2022Certified Gas-Gas-Piping-RoughingCertifiedView ↗
04/29/2022Certified Water and Sanitary-WS-Sanitary Piping-RoughingCertifiedView ↗
04/29/2022Certified Water and Sanitary-WS-Sanitary Piping-UndergroundCertifiedView ↗
▾Special Inspection Requirements (DOB NOW) — 19
DateRequirementInspectorRole
01/08/2024HVAC-R and service water heating system controlsHackjong Choienergy_progress
01/08/2024Ventilation and air distribution systemHackjong Choienergy_progress
01/08/2024Fire-Resistant Penetrations and JointsHackjong Choispecial
01/08/2024Mechanical SystemsHackjong Choispecial
01/08/2024FinalHackjong Choiprogress
01/08/2024Maintenance informationHackjong Choienergy_progress
01/08/2024HVAC-R and service water heating equipmentHackjong Choienergy_progress
01/08/2024HVAC-R and service water piping design and insulationHackjong Choienergy_progress
10/25/2022HVAC-R and service water piping design and insulationCHI WAI CHUNGenergy_progress
10/25/2022Energy Code Compliance InspectionsCHI WAI CHUNGprogress
10/24/2022Energy Code Compliance InspectionsCHI WAI CHUNGprogress
10/24/2022HVAC-R and service water piping design and insulationCHI WAI CHUNGenergy_progress
08/25/2022Interior lighting powerCHI WAI CHUNGenergy_progress
08/25/2022Fenestration areasCHI WAI CHUNGenergy_progress
08/25/2022Fire-Resistant Penetrations and JointsCHI WAI CHUNGspecial
08/25/2022Fenestration air leakageCHI WAI CHUNGenergy_progress
08/25/2022Air barrier - visual inspectionCHI WAI CHUNGenergy_progress
08/25/2022Fenestration and door U-factor and product ratingsCHI WAI CHUNGenergy_progress
08/25/2022Energy Code Compliance InspectionsCHI WAI CHUNGprogress
▾Documents — 33 on file (BIS + DOB NOW)
▸Plans & Drawings7
▸DOB NOWPlans/Sketch7
08/31/2026B00625989-P1Request digital key ↗
08/31/2026B00625989-I1Request digital key ↗
08/31/2026B00626013-P2Request digital key ↗
Showing 3 of 7 on file for this type
▸Seals & Professional Certifications17
▸DOB NOWProgress Inspector Seal & Signature8
09/01/2026B00626013-I1Open ↗
09/01/2026B00626013-I1Open ↗
08/28/2026B00625989-I1Open ↗
Showing 3 of 8 on file for this type
▸DOB NOWDPL-1: Design Professional Seal & Signature7
08/31/2026B00625989-I1Open ↗
08/31/2026B00625989-P1Open ↗
08/31/2026B00626013-P2Open ↗
Showing 3 of 7 on file for this type
▸DOB NOWSpecial Inspector Seal & Signature2
08/28/2026B00625989-I1Open ↗
08/26/2026B00944747-I1Open ↗
▸Environmental & Asbestos7
▸DOB NOWDEP ACP-5: Asbestos Assessment Report7
08/31/2026B00625989-I1Open ↗
08/31/2026B00625989-P1Open ↗
08/31/2026B00626013-I1Open ↗
Showing 3 of 7 on file for this type
▸Energy Compliance2
▸DOB NOWEN2: As Built Energy Analysis.2
08/31/2026B00626013-I1Open ↗
08/13/2026B00625989-I1Open ↗