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Miscellaneous one family
521 9 STREET
BROOKLYN · BIN 3025979
💬 Discuss this project
1909Year Built
2Stories
A9Building Class
R6BZoning
3,000 sfGross Floor Area
1Units
5 Open Violations ▸FDNY Report ↗
Miscellaneous one family · 1,600 sf lot · 1.88 FAR built · Flood zone X
Locations of Work
ArchitectureElectricalMechanicalPlumbing
Permit Issued — active, not yet Signed-off
Floor 2Under Construction35p · 2 filings · 20 docs
Floor 1Under Construction32p · 2 filings · 20 docs
CellarUnder Construction36p · 2 filings · 20 docs
BasementUnder Construction18p · 1 filing · 20 docs
Sub-BasementUnder Construction14p · 1 filing · 20 docs
1 job · most recent 02/10/2025
Heating and Air Conditioning Systems
FiledStatusContractorScopeMake / Model / Capacity
02/10/2025Permit IssuedBUILDWISE CONSTRUCTION GRHeating and Air Conditioning Systems
Heat / Cool
Mitsubishi Electric MXZ-SM36NAMHZ 36,000 BTU · Heat Pump Outdoor ×6
1 job · most recent 02/10/2025
Gas Water/Sanitary
FiledStatusContractorScope
02/10/2025Permit IssuedW.R. PLBG AND HTG CORPGas, Water/Sanitary
2 jobs · most recent 05/19/2026
General Wiring
FiledStatusContractorScope
05/19/2026CompleteP.L. ELEC'L CONTR'G CORPGeneral Wiring
05/01/2023CompleteP.L. ELEC'L CONTR'G CORP—
Building Lifecycle
All (88)Filed (4)Permit Issued (13)Violation (6)Inspection (7)Objection (28)Special Inspection (30)
04/23/2026
Permit issued — Mechanical Systems
B00685606-I1-GC
04/06/2026
Inspection — Certified Water and Sanitary-WS-Sanitary Piping-Roughing
Certified
View inspection ↗
02/18/2026
Permit issued — Plumbing
B08028988-I1-PL
06/03/2025
Permit issued — Plumbing
B08028988-I1-PL
05/12/2025
Permit issued — Mechanical Systems
B00685606-I1-GC
05/01/2025
Inspection — Pass-Final PL - More than 10 Requested Floors
Pass
View inspection ↗
04/30/2025
Permit issued — General Construction
B00685606-I1-GC
04/17/2025
Inspection — Certified Gas-Gas-Piping-Roughing
Certified
View inspection ↗
04/17/2025
Inspection — Certified Storm Drainage-ST-Piping-Underground
Certified
View inspection ↗
04/17/2025
Inspection — Certified Water and Sanitary-WS-Sanitary Piping-Roughing
Certified
View inspection ↗
04/17/2025
Inspection — Certified Water and Sanitary-WS-Sanitary Piping-Underground
Certified
View inspection ↗
04/15/2025
Inspection — Certified Remove/Cap - work done in accordance with code
Certified
View inspection ↗
03/19/2025
Special inspection requirement — Fire-Resistant Penetrations and Joints
KY FU
03/19/2025
Special inspection requirement — Energy Code Compliance Inspections
KY FU
03/19/2025
Special inspection requirement — HVAC-R and service water heating equipment
KY FU
03/19/2025
Special inspection requirement — Maintenance information
KY FU
03/19/2025
Special inspection requirement — HVAC-R and service water heating system controls
KY FU
03/19/2025
Special inspection requirement — HVAC-R and service water piping design and insulation
KY FU
02/25/2025
Special inspection requirement — HVAC-R and service water heating equipment
KY FU
02/25/2025
Special inspection requirement — Fenestration air leakage
KY FU
02/25/2025
Special inspection requirement — Insulation placement and R values
KY FU
02/25/2025
Special inspection requirement — Fire-Resistant Penetrations and Joints
KY FU
02/25/2025
Special inspection requirement — Mechanical Systems
KY FU
02/25/2025
Special inspection requirement — Energy Code Compliance Inspections
KY FU
02/25/2025
Special inspection requirement — Final
KY FU
02/25/2025
Special inspection requirement — Fire-Resistance Rated Construction
KY FU
02/25/2025
Special inspection requirement — Interior lighting power
KY FU
02/25/2025
Special inspection requirement — Air barrier - visual inspection
KY FU
02/25/2025
Special inspection requirement — Maintenance information
KY FU
02/25/2025
Special inspection requirement — HVAC-R and service water heating system controls
KY FU
02/25/2025
Special inspection requirement — Fenestration areas
KY FU
02/25/2025
Special inspection requirement — HVAC-R and service water piping design and insulation
KY FU
02/25/2025
Special inspection requirement — Fenestration and door U-factor and product ratings
KY FU
02/10/2025
Filed — Alteration CO
PROPOSED TO CONVERT EXISTING (2) FAMILY TO (1) FAMILY DWELLING. REFURBISHMENT WORK AS PER PLAN AND REMEDY LANDMARK VIOLATIONS. NO CHANGE IN BULK AND OBTAIN NEW CERTIFICATE OF OCCUPANCY.
B00685606-P1
02/10/2025
Filed — Alteration
FILED PLUMBING WORK TYPE IN CONJUNCTION WITH GC JOB# B00685606.
B08028988-P1
01/22/2025
Special inspection requirement — HVAC-R and service water piping design and insulation
KY FU
01/22/2025
Special inspection requirement — Mechanical Systems
KY FU
01/22/2025
Special inspection requirement — Energy Code Compliance Inspections
KY FU
01/22/2025
Special inspection requirement — Final
KY FU
01/22/2025
Special inspection requirement — Fire-Resistance Rated Construction
KY FU
01/22/2025
Special inspection requirement — Fenestration and door U-factor and product ratings
KY FU
01/22/2025
Special inspection requirement — HVAC-R and service water heating equipment
KY FU
01/22/2025
Special inspection requirement — HVAC-R and service water piping design and insulation
KY FU
01/22/2025
Special inspection requirement — Fenestration areas
KY FU
08/08/2024
Permit issued — General Construction
B00685606-I1-MS
05/17/2024
Permit issued — Plumbing
B08028988-I1-PL
03/29/2024
Permit issued — Mechanical Systems
B00685606-I1-GC
05/12/2023
Permit issued — Mechanical Systems
B00685606-I1-MS
05/10/2023
Permit issued — General Construction
B00685606-I1-GC
04/20/2023
Permit issued — Plumbing
B08028988-I1-PL
04/11/2023
Permit issued — Mechanical Systems
B00685606-I1-GC
04/10/2023
Permit issued — Mechanical Systems
B00685606-I1-MS
11/10/2022
Objection raised — Mechanical
11/10/2022
Objection resolved — Addressed
11/10/2022
Objection raised — Inspections
11/10/2022
Objection resolved — Addressed
11/10/2022
Objection raised — Admin
11/10/2022
Objection resolved — Addressed
11/01/2022
Filed — Alteration
FILED PLUMBING WORK TYPE IN CONJUNCTION WITH GC JOB# B00685606.
B08028988-I1
10/27/2022
Objection raised — Other
Latest 60 of 88 events.
▾Sales History (ACRIS)
DatePriceUnitSeller → Buyer$/sf
08/18/2016$3.3M—Private party → Private party$1,093/sf building
▾Design Consultants (Architect / Engineer of Record)
FirmFilingsMost Recent
FLUSHING ENGINEERING SERVICE PC402/10/2025
▾Filing Representatives (Expediters)
RepresentativeFilingsMost Recent
K A INTERIOR DESIGN803/21/2026
▾Contractors (License-Anchored)
FirmTradeRolesMost Recent
148 HUA HONG INCGeneral Contractor1107/08/2026
CORE MECHANICAL CONTRACTINGGeneral Contractor303/21/2026
PIPESTYLISTS, INCPlumbing307/08/2026
BUILDWISE CONSTRUCTION GRGeneral Contractor107/08/2026
CUBE BUILDERS GROUP NYGeneral Contractor104/09/2026
W.R. PLBG AND HTG CORPPlumbing107/08/2026
▾Special Inspection Agencies
AgencyLicense #FilingsMost Recent
FLUSHING ENGINEERING SERV4373402/10/2025
Permit / Filing Register
SourceWork TypeStatusApplicantIssued
DOB NOWMechanical SystemsPermit IssuedBUILDWISE CONSTRUCTION GR04/23/2026
DOB NOWPlumbingPermit IssuedW.R. PLBG AND HTG CORP02/18/2026
DOB NOWPlumbingPermit IssuedT & T PLUMBING INC06/03/2025
DOB NOWMechanical SystemsPermit IssuedCUBE BUILDERS GROUP NY05/12/2025
DOB NOWGeneral ConstructionPermit Issued148 HUA HONG04/30/2025
DOB NOWGeneral ConstructionPermit IssuedCORE MECHANICAL CONTRACTI08/08/2024
DOB NOWPlumbingPermit IssuedT & T PLUMBING INC05/17/2024
DOB NOWMechanical SystemsPermit Issued148 HUA HONG03/29/2024
DOB NOWMechanical SystemsPermit Issued148 HUA HONG05/12/2023
DOB NOWGeneral ConstructionPermit Issued148 HUA HONG05/10/2023
DOB NOWPlumbingPermit IssuedT & T PLUMBING INC04/20/2023
DOB NOWMechanical SystemsPermit Issued148 HUA HONG04/11/2023
DOB NOWMechanical SystemsPermit Issued148 HUA HONG04/10/2023
▾Field Inspections (DOB CAP) — 7
DateTypeResultReport
04/06/2026Certified Water and Sanitary-WS-Sanitary Piping-RoughingCertifiedView ↗
05/01/2025Pass-Final PL - More than 10 Requested FloorsPassView ↗
04/17/2025Certified Gas-Gas-Piping-RoughingCertifiedView ↗
04/17/2025Certified Storm Drainage-ST-Piping-UndergroundCertifiedView ↗
04/17/2025Certified Water and Sanitary-WS-Sanitary Piping-RoughingCertifiedView ↗
04/17/2025Certified Water and Sanitary-WS-Sanitary Piping-UndergroundCertifiedView ↗
04/15/2025Certified Remove/Cap - work done in accordance with codeCertifiedView ↗
▾Special Inspection Requirements (DOB NOW) — 42
DateRequirementInspectorRole
03/19/2025Fire-Resistant Penetrations and JointsKY FUspecial
03/19/2025Energy Code Compliance InspectionsKY FUprogress
03/19/2025HVAC-R and service water heating equipmentKY FUenergy_progress
03/19/2025Maintenance informationKY FUenergy_progress
03/19/2025HVAC-R and service water heating system controlsKY FUenergy_progress
03/19/2025HVAC-R and service water piping design and insulationKY FUenergy_progress
02/25/2025HVAC-R and service water heating equipmentKY FUenergy_progress
02/25/2025Fenestration air leakageKY FUenergy_progress
02/25/2025Insulation placement and R valuesKY FUenergy_progress
02/25/2025Fire-Resistant Penetrations and JointsKY FUspecial
02/25/2025Mechanical SystemsKY FUspecial
02/25/2025Energy Code Compliance InspectionsKY FUprogress
02/25/2025FinalKY FUprogress
02/25/2025Fire-Resistance Rated ConstructionKY FUprogress
02/25/2025Interior lighting powerKY FUenergy_progress
02/25/2025Air barrier - visual inspectionKY FUenergy_progress
02/25/2025Maintenance informationKY FUenergy_progress
02/25/2025HVAC-R and service water heating system controlsKY FUenergy_progress
02/25/2025Fenestration areasKY FUenergy_progress
02/25/2025HVAC-R and service water piping design and insulationKY FUenergy_progress
02/25/2025Fenestration and door U-factor and product ratingsKY FUenergy_progress
01/22/2025HVAC-R and service water piping design and insulationKY FUenergy_progress
01/22/2025Mechanical SystemsKY FUspecial
01/22/2025Energy Code Compliance InspectionsKY FUprogress
01/22/2025FinalKY FUprogress
Latest 25 of 42.
▾Documents — 63 on file (BIS + DOB NOW)
▸Plans & Drawings4
▸DOB NOWPlans/Sketch4
08/22/2026B00685606-P1Request digital key ↗
08/22/2026B00685606-I1Request digital key ↗
08/22/2026B08028988-P1Request digital key ↗
Showing 3 of 4 on file for this type
▸Applications & Permits4
▸DOB NOWLPC Approval/Permit4
08/22/2026B08028988-I1Open ↗
08/13/2026B00685606-I1Open ↗
08/13/2026B00685606-P1Open ↗
Showing 3 of 4 on file for this type
▸Seals & Professional Certifications46
▸DOB NOWProgress Inspector Seal & Signature36
09/20/2026B08028988-I1Open ↗
09/20/2026B08028988-I1Open ↗
09/20/2026B08028988-I1Open ↗
Showing 3 of 36 on file for this type
▸DOB NOWSpecial Inspector Seal & Signature6
09/20/2026B08028988-I1Open ↗
09/01/2026B00685606-I1Open ↗
09/01/2026B00685606-I1Open ↗
Showing 3 of 6 on file for this type
▸DOB NOWDPL-1: Design Professional Seal & Signature4
08/22/2026B00685606-P1Open ↗
08/22/2026B00685606-I1Open ↗
08/22/2026B08028988-I1Open ↗
Showing 3 of 4 on file for this type
▸Safety & Tenant Protection3
▸DOB NOWStreet Tree Checklist2
08/13/2026B00685606-P1Open ↗
08/13/2026B00685606-I1Open ↗
▸DOB NOWParks Department Acknowledgment Letter for Street Trees Plan1
08/13/2026B00685606-I1Open ↗
▸Environmental & Asbestos4
▸DOB NOWDEP ACP-5: Asbestos Assessment Report4
08/22/2026B00685606-I1Open ↗
08/22/2026B00685606-P1Open ↗
08/22/2026B08028988-I1Open ↗
Showing 3 of 4 on file for this type
▸Other Documents2
▸DOB NOWProperty Ownership Certification2
08/22/2026B00685606-P1Open ↗
08/22/2026B00685606-I1Open ↗