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Elevator apt, semi-fireproof without stores
520 EAST 21 STREET
BROOKLYN · Flatbush · BIN 3119497
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1951Year Built
6Stories
D1Building Class
R7AZoning
103,494 sfGross Floor Area
102Units
LL97 CoveredRent Stabilized233 Open Violations ▸FISP: No Report FiledFDNY Report ↗
Elevator apt, semi-fireproof without stores · Owner of record: DITMAS FLATS LLC · 27,000 sf lot · 3.83 FAR built · Flood zone X
Locations of Work
StructuralMechanicalEquipment
Site & exterior6p · 1 filing · 2 docs
▾Owner History (Filing Record)
Companies and organizations named on filings. Individual owners are not shown.
OwnerFilingsMost Recent
DITMAS FLATS LLC C O1103/22/2026
BSP EAST 21403/21/2026
B H CONTRACTING203/21/2026
▾Sales History (ACRIS)
DatePriceUnitSeller → Buyer$/sf
03/30/2015$26.5M—— → —$256/sf building
12/23/2013$15.0M—520 REALTY NY LLC → BSP EAST 21 LLC$145/sf building
▾Design Consultants (Architect / Engineer of Record)
FirmFilingsMost Recent
MSM ENGINEERING SERVICES, PLLC104/20/2024
▾Contractors (License-Anchored)
FirmTradeRolesMost Recent
SUPREME INSTALLATIONS CORGeneral Contractor404/09/2026
Building Lifecycle
All (70)Filed (1)Permit Issued (2)Signed Off (1)Facade (FISP) (6)Violation (60)
08/31/2026
Violation issued (HPD, open)
A
08/31/2026
Violation issued (HPD, open)
A
08/31/2026
Violation issued (HPD, open)
A
08/31/2026
Violation issued (HPD, open)
A
08/31/2026
Violation issued (HPD, open)
B
08/21/2026
Violation issued (HPD, open)
B
08/21/2026
Violation issued (HPD, open)
B
08/21/2026
Violation issued (HPD, open)
B
08/21/2026
Violation issued (HPD, open)
C
08/21/2026
Violation issued (HPD, open)
B
08/21/2026
Violation issued (HPD, open)
B
08/21/2026
Violation issued (HPD, open)
B
08/21/2026
Violation issued (HPD, open)
A
08/21/2026
Violation issued (HPD, open)
B
08/21/2026
Violation issued (HPD, open)
A
08/21/2026
Violation issued (HPD, open)
B
08/21/2026
Violation issued (HPD, open)
B
08/21/2026
Violation issued (HPD, open)
B
08/21/2026
Violation issued (HPD, open)
B
08/21/2026
Violation issued (HPD, open)
C
08/21/2026
Violation issued (HPD, open)
B
08/21/2026
Violation issued (HPD, open)
B
07/21/2026
Violation issued (ECB, open)
Elevators
07/21/2026
Violation issued (ECB, open)
Elevators
06/24/2026
Violation issued (HPD, closed)
A
06/22/2026
Violation issued (HPD, closed)
B
06/22/2026
Violation issued (HPD, closed)
B
06/22/2026
Violation issued (HPD, closed)
B
06/22/2026
Violation issued (HPD, closed)
B
06/22/2026
Violation issued (HPD, open)
C
06/22/2026
Violation issued (HPD, closed)
B
05/20/2026
Violation issued (HPD, closed)
B
05/20/2026
Violation issued (HPD, closed)
B
05/20/2026
Violation issued (HPD, closed)
C
04/22/2026
Violation issued (HPD, closed)
C
04/15/2026
Violation issued (HPD, closed)
C
04/15/2026
Violation issued (HPD, closed)
B
04/15/2026
Violation issued (HPD, closed)
C
04/15/2026
Violation issued (HPD, closed)
C
04/15/2026
Violation issued (HPD, closed)
A
04/15/2026
Violation issued (HPD, closed)
C
04/14/2026
Violation issued (HPD, closed)
B
04/14/2026
Violation issued (HPD, closed)
C
04/14/2026
Violation issued (HPD, closed)
A
04/14/2026
Violation issued (HPD, closed)
A
04/14/2026
Violation issued (HPD, closed)
A
04/14/2026
Violation issued (HPD, closed)
B
04/14/2026
Violation issued (HPD, closed)
B
04/14/2026
Violation issued (HPD, closed)
B
04/14/2026
Violation issued (HPD, closed)
C
04/14/2026
Violation issued (HPD, closed)
C
04/14/2026
Violation issued (HPD, open)
B
04/14/2026
Violation issued (HPD, closed)
C
04/14/2026
Violation issued (HPD, closed)
B
04/14/2026
Violation issued (HPD, closed)
A
04/14/2026
Violation issued (HPD, closed)
B
04/01/2026
Signed off — Alteration
INSTALLATION OF TEMPORARY HEAVY DUTY SIDEWALK SHED AS PER PLANS. NO CHANGE IN USE, EGRESS OR OCCUPANCY. SIDEWALK SHED SHALL COMPLY WITH CHAPTER #33 OF 2022 THE NYC BUILDING CODE. LIVE LOAD 300PSF.
B01038815-I1
03/24/2026
Violation issued (HPD, closed)
B
03/24/2026
Violation issued (HPD, closed)
B
03/24/2026
Violation issued (HPD, closed)
C
Latest 60 of 70 events.
Permit / Filing Register
SourceWork TypeStatusApplicantIssued
DOB NOWSidewalk ShedSigned-offSUPREME INSTALLATIONS COR04/21/2025
DOB NOWSidewalk ShedSigned-offSUPREME INSTALLATIONS COR05/09/2024
BISFBISSUEDENVIRONMENTAL PRO MECH02/23/2017
BISFBISSUEDENVIRONMENTAL PRO MECH02/09/2016
BISOTISSUEDNEW FAMILY HOMES & BUILDING01/29/2016
BISFBISSUEDENVIRONMENTAL PRO MECH01/20/2016
BISPLISSUEDA. HTG AND PLBG WORKS INC01/20/2016
BISOTISSUEDB & H CONTRACTING CORP12/03/2014
BISEQISSUEDPILKU CONSTRUCTION SERVIC10/14/2014
BISEQISSUEDPILKU CONSTRUCTION SERVIC08/12/2014
BISFSISSUEDNEAL M. RUDIKOFF06/19/1995
BISOTISSUEDNATIONAL AIR CORRECTION12/21/1990
2 projects · most recent 02/16/2026
General Wiring
FiledStatusContractorScope
02/16/2026Permit IssuedEP ELECTRIC NY LLCGeneral Wiring
04/23/2024Permit IssuedRICHARD NEU—
Nothing on file for this building.
▾Documents — 78 on file (BIS + DOB NOW)
▸Plans & Drawings1
▸DOB NOWPlans/Sketch1
08/25/2026B01038815-I1Request digital key ↗
▸Applications & Permits12
▸BISPLAN / WORK APPROVAL APPLICATION6
09/22/2017321305306Open ↗
02/01/2016321305306Open ↗
01/19/2016340345380Open ↗
Showing 3 of 6 on file for this type
▸BISWORK PERMIT APPLICATION5
02/01/2016321305306Open ↗
01/19/2016340345380Open ↗
01/19/2016340345380Open ↗
Showing 3 of 5 on file for this type
▸BISPLAN - WORK & PERMITS - SUPPPORTING DOCUMENTATION1
09/18/2017321305306Open ↗
▸Seals & Professional Certifications20
▸BISTECHNICAL REPORT: RESPONSIBILITY/CERTIFICATION5
02/13/2017321305306Open ↗
06/02/2016321305306Open ↗
02/01/2016321305306Open ↗
Showing 3 of 5 on file for this type
▸BISPROFESSIONAL CERTIFICATION STATEMENT5
02/01/2016321305306Open ↗
01/19/2016340345380Open ↗
11/06/2014340203274Open ↗
Showing 3 of 5 on file for this type
▸BISREQUIRED ITEMS CHECKLIST FOR PROFESSIONAL CERTIFICATION4
01/19/2016340345380Open ↗
11/06/2014340203274Open ↗
10/10/2014340195531Open ↗
Showing 3 of 4 on file for this type
▸BISTECHNICAL REPORT STATEMENT OF RESPONSIBILITY4
01/19/2016340345380Open ↗
11/06/2014340203274Open ↗
10/10/2014340195531Open ↗
Showing 3 of 4 on file for this type
▸BISPROFESSIONAL CERTIFIED CHECKLIST1
02/01/2016321305306Open ↗
▸DOB NOWDPL-1: Design Professional Seal & Signature1
08/25/2026B01038815-I1Open ↗
▸Trade Schedules & Equipment2
▸BISSCHEDULE C - HEATING & COMBUSTION EQUIPMENT1
01/19/2016340345380Open ↗
▸BISSCHEDULE B - PLUMBING1
01/19/2016340345380Open ↗
▸Environmental & Asbestos4
▸BISASBESTOS: CERTIFICATION (DEP ACP5)4
02/01/2016321305306Open ↗
01/19/2016340345380Open ↗
11/06/2014340203274Open ↗
Showing 3 of 4 on file for this type
▸Energy Compliance12
▸BISTECHNICAL REPORT: ENERGY CODE PROGRESS INSPS4
10/31/2017340345380Open ↗
02/13/2017321305306Open ↗
06/02/2016321305306Open ↗
Showing 3 of 4 on file for this type
▸BISAS-BUILT ENERGY ANALYSIS3
10/31/2017340345380Open ↗
02/13/2017321305306Open ↗
06/02/2016321305306Open ↗
▸BISTECHNICAL REPORT: ENERGY CODE - RESPONSIBILITY2
01/19/2016340345380Open ↗
11/06/2014340203274Open ↗
▸BISTECHNICAL REPORT STATEMENT OF RESPONSIBILITY FOR ENERGY CODE PROGRESS INSPECTIONS2
01/19/2016340345380Open ↗
11/06/2014340203274Open ↗
▸BISELECTRICAL APPLICATION FOR SIDEWALK SHED LIGHTING1
10/10/2014340195531Open ↗
▸Inspections & Test Reports4
▸BISTECHNICAL REPORT: RESPONSIBILITY4
01/19/2016340345380Open ↗
11/06/2014340203274Open ↗
10/10/2014340195531Open ↗
Showing 3 of 4 on file for this type
▸Approvals, Objections & Sign-offs7
▸BISCERTIFICATE OF OCCUPANCY/LOC: REQUEST5
10/31/2017340345380Open ↗
02/13/2017321305306Open ↗
06/02/2016321305306Open ↗
Showing 3 of 5 on file for this type
▸BISADMINISTRATIVE OBJECTIONS1
02/01/2016321305306Open ↗
▸BISLETTERS - SUPPORTING DOCUMENTATION1
10/31/2017340345380Open ↗
▸Cost, Insurance & Ownership7
▸BISCOST AFFIDAVIT6
10/31/2017340345380Open ↗
02/13/2017321305306Open ↗
06/02/2016321305306Open ↗
Showing 3 of 6 on file for this type
▸BISPROJECT-SPECIFIC GL INSURANCE1
02/01/2016321305306Open ↗
▸Filing & Intake Forms7
▸BISEFILING JOB APPLICATION COVER SHEET4
01/19/2016340345380Open ↗
11/06/2014340203274Open ↗
10/10/2014340195531Open ↗
Showing 3 of 4 on file for this type
▸BISBOROUGH INTAKE FORM1
10/31/2017340345380Open ↗
▸BISADDITIONAL INFORMATION1
09/22/2017321305306Open ↗
▸BISEFILING COVER SHEET1
02/01/2016321305306Open ↗
▸Other Documents2
▸BISCONSTRUCTION - SUPPORTING DOCUMENTATION2
10/10/2014340195531Open ↗
08/11/2014340173662Open ↗