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Five to six families
520 UNION AVENUE
BROOKLYN · BIN 3068236
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1928Year Built
3Stories
C2Building Class
M1-2/R6AZoning
4,500 sfGross Floor Area
5Units
Rent Stabilized0 Open ViolationsFDNY Report ↗
Five to six families · Owner of record: 520 UNION OWNER LLC · 1,700 sf lot · 2.65 FAR built · Flood zone X500
Locations of Work
ArchitectureMechanical
Floor 31p · 1 filing · 20 docs
Floor 2
Floor 1
Cellar2p · 1 filing · 20 docs
▾Owner History (Filing Record)
Companies and organizations named on filings. Individual owners are not shown.
OwnerFilingsMost Recent
PEAK707/08/2026
520 UNION OWNER LLC103/22/2026
▾Sales History (ACRIS)
DatePriceUnitSeller → Buyer$/sf
03/15/2023$3.2M—— → —$706/sf building
▾Design Consultants (Architect / Engineer of Record)
FirmFilingsMost Recent
JAMES CHAI ARCHITECT, P.C.306/19/2023
▾Filing Representatives (Expediters)
RepresentativeFilingsMost Recent
RICHARD WAINER ARCHITECT, PLLC603/21/2026
▾Contractors (License-Anchored)
FirmTradeRolesMost Recent
JKO USA MANAGEMENT INCGeneral Contractor307/08/2026
PIPESTYLISTS, INCPlumbing107/08/2026
▾Special Inspection Agencies
AgencyLicense #FilingsMost Recent
JAMES JH CHAI & ASSOCIATE6481306/19/2023
Building Lifecycle
All (72)Filed (3)Permit Issued (3)Signed Off (3)Violation (40)Inspection (4)Special Inspection (19)
08/11/2023
Signed off — Alteration
RENOVATE UNITS 1, 2L, 2R, 3L, 3R & COMMON HOLLWAY FROM CELLAR TO ROOF, INCLUDING REMOVING AND INSTALLING NEW INTERIOR NON-LOAD BEARING PARTITIONS, PLUMBING, MECHANICAL, LIGHTING AND FINISH WORK. NO CHANGE TO USE, EGRESS OR OCCUPANCY.
B00843109-I1
08/07/2023
Signed off — Alteration
RENOVATE UNITS 1, 2L, 2R, 3L, 3R & COMMON HOLLWAY FROM CELLAR TO ROOF, INCLUDING REMOVING AND INSTALLING NEW INTERIOR NON-LOAD BEARING PARTITIONS, PLUMBING, MECHANICAL, LIGHTING AND FINISH WORK. NO CHANGE TO USE, EGRESS OR OCCUPANCY.
B00843109-S1
08/07/2023
Signed off — Alteration
RENOVATE UNITS 1, 2L, 2R, 3L, 3R & COMMON HOLLWAY FROM CELLAR TO ROOF, INCLUDING REMOVING AND INSTALLING NEW INTERIOR NON-LOAD BEARING PARTITIONS, PLUMBING, MECHANICAL, LIGHTING AND FINISH WORK. NO CHANGE TO USE, EGRESS OR OCCUPANCY.
B00843109-S2
07/18/2023
Permit issued — Mechanical Systems
B00843109-S1-MS
07/14/2023
Inspection — Certified Water and Sanitary-WS-Sanitary Piping-Roughing
Certified
View inspection ↗
07/14/2023
Inspection — Certified Water and Sanitary-WS-Sanitary Piping-Underground
Certified
View inspection ↗
07/07/2023
Inspection — Certified Water and Sanitary-WS-Sanitary Piping-Roughing
Certified
View inspection ↗
07/05/2023
Inspection — Certified Remove/Cap - work done in accordance with code
Certified
View inspection ↗
06/27/2023
Permit issued — Plumbing
B00843109-S2-PL
06/23/2023
Permit issued — General Construction
B00843109-I1-GC
06/19/2023
Filed — Alteration
RENOVATE UNITS 1, 2L, 2R, 3L, 3R & COMMON HOLLWAY FROM CELLAR TO ROOF, INCLUDING REMOVING AND INSTALLING NEW INTERIOR NON-LOAD BEARING PARTITIONS, PLUMBING, MECHANICAL, LIGHTING AND FINISH WORK. NO CHANGE TO USE, EGRESS OR OCCUPANCY.
B00843109-I1
06/19/2023
Filed — Alteration
RENOVATE UNITS 1, 2L, 2R, 3L, 3R & COMMON HOLLWAY FROM CELLAR TO ROOF, INCLUDING REMOVING AND INSTALLING NEW INTERIOR NON-LOAD BEARING PARTITIONS, PLUMBING, MECHANICAL, LIGHTING AND FINISH WORK. NO CHANGE TO USE, EGRESS OR OCCUPANCY.
B00843109-S1
06/19/2023
Filed — Alteration
RENOVATE UNITS 1, 2L, 2R, 3L, 3R & COMMON HOLLWAY FROM CELLAR TO ROOF, INCLUDING REMOVING AND INSTALLING NEW INTERIOR NON-LOAD BEARING PARTITIONS, PLUMBING, MECHANICAL, LIGHTING AND FINISH WORK. NO CHANGE TO USE, EGRESS OR OCCUPANCY.
B00843109-S2
06/14/2023
Special inspection requirement — Metering
Joon Ho Chai
06/14/2023
Special inspection requirement — Mechanical Systems
Joon Ho Chai
06/14/2023
Special inspection requirement — Final
Joon Ho Chai
06/14/2023
Special inspection requirement — HVAC-R and service water piping design and insulation
Joon Ho Chai
06/14/2023
Special inspection requirement — HVAC-R and service water heating system controls
Joon Ho Chai
06/14/2023
Special inspection requirement — HVAC-R and service water heating equipment
Joon Ho Chai
06/14/2023
Special inspection requirement — Maintenance information
Joon Ho Chai
06/14/2023
Special inspection requirement — Permanent certificate
Joon Ho Chai
06/14/2023
Special inspection requirement — Air barrier - visual inspection
Joon Ho Chai
06/14/2023
Special inspection requirement — Fire-Resistant Penetrations and Joints
Joon Ho Chai
06/14/2023
Special inspection requirement — Energy Code Compliance Inspections
Joon Ho Chai
06/14/2023
Special inspection requirement — Fire-Resistance Rated Construction
Joon Ho Chai
06/14/2023
Special inspection requirement — Fenestration and door U-factor and product ratings
Joon Ho Chai
06/14/2023
Special inspection requirement — Fenestration areas
Joon Ho Chai
06/14/2023
Special inspection requirement — Fenestration air leakage
Joon Ho Chai
06/14/2023
Special inspection requirement — Insulation placement and R values
Joon Ho Chai
06/14/2023
Special inspection requirement — Interior lighting power
Joon Ho Chai
03/27/2023
Violation issued (HPD, closed)
A
03/14/2023
Special inspection requirement — Final
Joon Ho Chai
03/13/2023
Special inspection requirement — Fire-Resistant Penetrations and Joints
Joon Ho Chai
11/07/2022
Violation issued (HPD, closed)
I
03/02/2022
Violation issued (HPD, closed)
A
05/26/2021
Violation issued (HPD, closed)
C
05/26/2021
Violation issued (HPD, closed)
A
05/26/2021
Violation issued (HPD, closed)
B
05/26/2021
Violation issued (HPD, closed)
A
05/26/2021
Violation issued (HPD, closed)
B
05/26/2021
Violation issued (HPD, closed)
C
05/26/2021
Violation issued (HPD, closed)
B
05/26/2021
Violation issued (HPD, closed)
B
05/26/2021
Violation issued (HPD, closed)
A
05/26/2021
Violation issued (HPD, closed)
A
05/26/2021
Violation issued (HPD, closed)
A
05/26/2021
Violation issued (HPD, closed)
A
05/26/2021
Violation issued (HPD, closed)
A
05/26/2021
Violation issued (HPD, closed)
A
05/26/2021
Violation issued (HPD, closed)
A
04/13/2021
Violation issued (HPD, closed)
I
04/13/2021
Violation issued (HPD, closed)
A
10/22/2018
Violation issued (HPD, closed)
I
04/06/2018
Violation issued (DOB, closed)
V*-DOB VIOLATION - DISMISSED
11/29/2017
Violation issued (HPD, closed)
I
11/15/2016
Violation issued (HPD, closed)
I
02/25/2015
Violation issued (HPD, closed)
I
08/16/2014
Violation issued (HPD, closed)
B
08/16/2014
Violation issued (HPD, closed)
C
03/16/2011
Violation issued (HPD, closed)
B
Latest 60 of 72 events.
Permit / Filing Register
SourceWork TypeStatusApplicantIssued
DOB NOWMechanical SystemsSigned-offJKO USA MANAGEMENT07/18/2023
DOB NOWPlumbingSigned-offT & T PLUMBING INC06/27/2023
DOB NOWGeneral ConstructionSigned-offJKO USA MANAGEMENT06/23/2023
BISPLISSUEDLEGACY PLUMBING & HTG LLC05/01/2012
BISEQISSUEDGABRIEL CHECK02/29/2012
BIS—ISSUEDGABRIEL CHECK02/29/2012
1 project · most recent 08/22/2023
General Wiring
FiledStatusContractorScope
08/22/2023CompleteE & M ELECTRICAL NY CORPGeneral Wiring
▾Field Inspections (DOB CAP) — 4
DateTypeResultReport
07/14/2023Certified Water and Sanitary-WS-Sanitary Piping-RoughingCertifiedView ↗
07/14/2023Certified Water and Sanitary-WS-Sanitary Piping-UndergroundCertifiedView ↗
07/07/2023Certified Water and Sanitary-WS-Sanitary Piping-RoughingCertifiedView ↗
07/05/2023Certified Remove/Cap - work done in accordance with codeCertifiedView ↗
▾Special Inspection Requirements (DOB NOW) — 19
DateRequirementInspectorRole
06/14/2023MeteringJoon Ho Chaienergy_progress
06/14/2023Mechanical SystemsJoon Ho Chaispecial
06/14/2023FinalJoon Ho Chaiprogress
06/14/2023HVAC-R and service water piping design and insulationJoon Ho Chaienergy_progress
06/14/2023HVAC-R and service water heating system controlsJoon Ho Chaienergy_progress
06/14/2023HVAC-R and service water heating equipmentJoon Ho Chaienergy_progress
06/14/2023Maintenance informationJoon Ho Chaienergy_progress
06/14/2023Permanent certificateJoon Ho Chaienergy_progress
06/14/2023Air barrier - visual inspectionJoon Ho Chaienergy_progress
06/14/2023Fire-Resistant Penetrations and JointsJoon Ho Chaispecial
06/14/2023Energy Code Compliance InspectionsJoon Ho Chaiprogress
06/14/2023Fire-Resistance Rated ConstructionJoon Ho Chaiprogress
06/14/2023Fenestration and door U-factor and product ratingsJoon Ho Chaienergy_progress
06/14/2023Fenestration areasJoon Ho Chaienergy_progress
06/14/2023Fenestration air leakageJoon Ho Chaienergy_progress
06/14/2023Insulation placement and R valuesJoon Ho Chaienergy_progress
06/14/2023Interior lighting powerJoon Ho Chaienergy_progress
03/14/2023FinalJoon Ho Chaiprogress
03/13/2023Fire-Resistant Penetrations and JointsJoon Ho Chaispecial
▾Documents — 31 on file (BIS + DOB NOW)
▸Plans & Drawings3
▸DOB NOWPlans/Sketch3
08/27/2026B00843109-I1Request digital key ↗
08/27/2026B00843109-S2Request digital key ↗
08/27/2026B00843109-S1Request digital key ↗
▸Seals & Professional Certifications22
▸DOB NOWProgress Inspector Seal & Signature16
09/01/2026B00843109-S1Open ↗
09/01/2026B00843109-S1Open ↗
09/01/2026B00843109-S1Open ↗
Showing 3 of 16 on file for this type
▸DOB NOWDPL-1: Design Professional Seal & Signature3
08/13/2026B00843109-S2Open ↗
08/13/2026B00843109-I1Open ↗
08/13/2026B00843109-S1Open ↗
▸DOB NOWSpecial Inspector Seal & Signature3
09/01/2026B00843109-S1Open ↗
09/01/2026B00843109-S1Open ↗
08/25/2026B00843109-I1Open ↗
▸Safety & Tenant Protection3
▸DOB NOWHPD-1: Anti-Harassment Area Checklist3
08/13/2026B00843109-S1Open ↗
08/13/2026B00843109-I1Open ↗
08/13/2026B00843109-S2Open ↗
▸Environmental & Asbestos3
▸DOB NOWDEP ACP-5: Asbestos Assessment Report3
08/13/2026B00843109-I1Open ↗
08/13/2026B00843109-S2Open ↗
08/13/2026B00843109-S1Open ↗