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Two family brick
5723 21 AVENUE
BROOKLYN · BIN 3131285
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1960Year Built
1Stories
B1Building Class
R5Zoning
1,764 sfGross Floor Area
2Units
3 Open Violations ▸FDNY Report ↗
Two family brick · 2,400 sf lot · 0.74 FAR built · Flood zone X
Locations of Work
Architecture
Permit Issued — active, not yet Signed-off
RoofUnder Construction3p · 3 filings · 19 docs
Floor 2Under Construction3p · 3 filings · 19 docs
Floor 1Under Construction2p · 1 filing · 5 docs
CellarUnder Construction4p · 3 filings · 19 docs
1 job · most recent 01/13/2026
General Wiring
FiledStatusContractorScope
01/13/2026Permit IssuedSEGA ELECTRIC LLCGeneral Wiring
1 job · most recent 01/07/2026
Fence
FiledStatusContractorScope
01/07/2026Permit IssuedBROOKLYN CONTRACTOR INCFence
Building Lifecycle
All (62)Filed (4)Permit Issued (2)Violation (3)Objection (26)Special Inspection (27)
09/18/2026
Objection resolved — Resolved
09/18/2026
Objection resolved — Resolved
09/18/2026
Objection resolved — Resolved
09/11/2026
Objection raised — Other
09/11/2026
Objection raised — Other
09/11/2026
Objection raised — Scope
07/30/2026
Objection resolved — Addressed
07/30/2026
Objection resolved — Addressed
07/30/2026
Objection resolved — Resolved
07/30/2026
Objection resolved — Addressed
07/21/2026
Objection resolved — Addressed
07/21/2026
Objection resolved — Addressed
07/21/2026
Objection resolved — Addressed
07/21/2026
Objection resolved — Addressed
07/08/2026
Objection raised — Other
07/08/2026
Objection raised — Other
07/08/2026
Objection raised — Other
07/08/2026
Objection raised — Other
07/08/2026
Objection raised — Scope
07/08/2026
Objection raised — Other
07/08/2026
Objection raised — Cost
07/08/2026
Objection raised — Other
06/30/2026
Filed — Alteration CO
HEREWITH FILING FOR HORIZONTAL ENLARGEMENT AND INTERIOR RENOVATION. (3) THREE STORY WITH CELLAR, (1) ONE FAMILY BUILDING. NO CHANGE IN USE, EGRESS OR OCCUPANCY
B01389748-I1
06/03/2026
Special inspection requirement — Interior lighting power
04/30/2026
Violation issued (DOB, open)
V-DOB VIOLATION - ACTIVE
04/30/2026
Violation issued (ECB, open)
Construction
04/20/2026
Special inspection requirement — Fenestration areas
04/20/2026
Special inspection requirement — Fire-Resistant Penetrations and Joints
04/20/2026
Special inspection requirement — Structural Stability – Alterations of existing buildings
04/20/2026
Special inspection requirement — Energy Code Compliance Inspections
04/20/2026
Special inspection requirement — Fire-Resistance Rated Construction
04/20/2026
Special inspection requirement — Air barrier — testing
04/20/2026
Special inspection requirement — Fenestration and door U-factor and product ratings
04/20/2026
Special inspection requirement — Permanent certificate
04/20/2026
Special inspection requirement — Fenestration air leakage
04/20/2026
Special inspection requirement — Insulation placement and R values
04/20/2026
Special inspection requirement — Metering
04/08/2026
Objection raised — Scope
03/24/2026
Objection raised — Admin
03/24/2026
Objection raised — Other
03/24/2026
Objection resolved — Addressed
03/13/2026
Permit issued — General Construction
B01341676-I1-GC
03/12/2026
Filed — Alteration CO
HEREWITH FILING FOR HORIZONTAL ENLARGEMENT AND INTERIOR RENOVATION. (3) THREE STORY WITH CELLAR, (1) ONE FAMILY BUILDING. NO CHANGE IN USE, EGRESS OR OCCUPANCY
B01366054-I1
03/05/2026
Special inspection requirement — Fire-Resistant Penetrations and Joints
03/05/2026
Special inspection requirement — Structural Stability – Alterations of existing buildings
03/05/2026
Special inspection requirement — Energy Code Compliance Inspections
03/05/2026
Special inspection requirement — Fire-Resistance Rated Construction
03/05/2026
Special inspection requirement — Fenestration areas
03/05/2026
Special inspection requirement — Fenestration and door U-factor and product ratings
03/05/2026
Special inspection requirement — Fenestration air leakage
03/05/2026
Special inspection requirement — Air barrier — testing
03/05/2026
Special inspection requirement — Insulation placement and R values
03/05/2026
Special inspection requirement — Permanent certificate
03/05/2026
Special inspection requirement — Metering
01/13/2026
Permit issued — Construction Fence
B01341676-S1-FN
01/07/2026
Filed — Alteration
HEREBY FILING FOR TEMPORARY CONSTRUCTION FENCE
B01341676-S1
01/07/2026
Filed — Alteration
HEREBY FILING FOR TEMPORARY CONSTRUCTION FENCE
B01341676-I1
01/07/2026
Special inspection requirement — Fire-Resistance Rated Construction
MOHAMED MAHMOUD
01/07/2026
Special inspection requirement — Energy Code Compliance Inspections
MOHAMED MAHMOUD
01/07/2026
Special inspection requirement — Fire-Resistant Penetrations and Joints
MOHAMED MAHMOUD
Latest 60 of 62 events.
▾Sales History (ACRIS)
DatePriceUnitSeller → Buyer$/sf
07/10/2025$2.6M—Private party → Private party$1,474/sf building
▾Design Consultants (Architect / Engineer of Record)
▾Filing Representatives (Expediters)
RepresentativeFilingsMost Recent
MISTER EXPEDITER103/21/2026
▾Contractors (License-Anchored)
FirmTradeRolesMost Recent
BROOKLYN CONTRACTOR INCGeneral Contractor207/08/2026
▾Special Inspection Agencies
AgencyLicense #FilingsMost Recent
MSM ENGINEERING SERVICES,8449101/07/2026
Permit / Filing Register
SourceWork TypeStatusApplicantIssued
DOB NOWGeneral ConstructionPermit IssuedBROOKLYN CONTRACTOR INC03/13/2026
DOB NOWConstruction FencePermit IssuedBROOKLYN CONTRACTOR INC01/13/2026
▾Special Inspection Requirements (DOB NOW) — 27
DateRequirementInspectorRole
06/03/2026Interior lighting power—energy_progress
04/20/2026Fenestration areas—energy_progress
04/20/2026Fire-Resistant Penetrations and Joints—special
04/20/2026Structural Stability – Alterations of existing buildings—special
04/20/2026Energy Code Compliance Inspections—progress
04/20/2026Fire-Resistance Rated Construction—progress
04/20/2026Air barrier — testing —energy_progress
04/20/2026Fenestration and door U-factor and product ratings—energy_progress
04/20/2026Permanent certificate—energy_progress
04/20/2026Fenestration air leakage—energy_progress
04/20/2026Insulation placement and R values—energy_progress
04/20/2026Metering—energy_progress
03/05/2026Fire-Resistant Penetrations and Joints—special
03/05/2026Structural Stability – Alterations of existing buildings—special
03/05/2026Energy Code Compliance Inspections—progress
03/05/2026Fire-Resistance Rated Construction—progress
03/05/2026Fenestration areas—energy_progress
03/05/2026Fenestration and door U-factor and product ratings—energy_progress
03/05/2026Fenestration air leakage—energy_progress
03/05/2026Air barrier — testing —energy_progress
03/05/2026Insulation placement and R values—energy_progress
03/05/2026Permanent certificate—energy_progress
03/05/2026Metering—energy_progress
01/07/2026Fire-Resistance Rated ConstructionMOHAMED MAHMOUDprogress
01/07/2026Energy Code Compliance InspectionsMOHAMED MAHMOUDprogress
Latest 25 of 27.
▾Documents — 19 on file (BIS + DOB NOW)
▸Plans & Drawings3
▸DOB NOWPlans/Sketch3
08/19/2026B01341676-S1Request digital key ↗
08/19/2026B01341676-I1Request digital key ↗
08/15/2026B01389748-I1Request digital key ↗
▸Zoning, Tax Lot & Property Records3
▸DOB NOWZD1: DOB Zoning Diagram2
08/15/2026B01389748-I1Open ↗
08/13/2026B01366054-I1Open ↗
▸DOB NOWZoning Exhibit form (1-5)1
08/15/2026B01389748-I1Open ↗
▸Seals & Professional Certifications6
▸DOB NOWDPL-1: Design Professional Seal & Signature3
08/19/2026B01341676-S1Open ↗
08/19/2026B01341676-I1Open ↗
08/16/2026B01389748-I1Open ↗
▸DOB NOWProgress Inspector Seal & Signature2
08/28/2026B01341676-I1Open ↗
08/28/2026B01341676-I1Open ↗
▸DOB NOWSpecial Inspector Seal & Signature1
08/28/2026B01341676-I1Open ↗
▸Environmental & Asbestos1
▸DOB NOWDEP ACP-5: Asbestos Assessment Report1
08/19/2026B01341676-I1Open ↗
▸Other Documents6
▸DOB NOWLocal Law 92/94 of 2019 Sustainable Roof Zone2
08/15/2026B01389748-I1Open ↗
08/13/2026B01366054-I1Open ↗
▸DOB NOWSite Survey: Initial2
08/15/2026B01389748-I1Open ↗
08/13/2026B01366054-I1Open ↗
▸DOB NOWProperty Ownership Certification1
08/15/2026B01389748-I1Open ↗
▸DOB NOWPlot Diagram1
08/15/2026B01389748-I1Open ↗