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Single or multiple dwelling with stores or offices
321A JEFFERSON AVENUE
BROOKLYN · BIN 3052021
💬 Discuss this project
1920Year Built
3Stories
S9Building Class
R6BZoning
3,797 sfGross Floor Area
4Units
0 Open ViolationsFDNY Report ↗
Single or multiple dwelling with stores or offices · 1,647 sf lot · 2.31 FAR built · Flood zone X
Locations of Work
Mechanical
Roof1p · 1 filing · 3 docs
▾Design Consultants (Architect / Engineer of Record)
FirmFilingsMost Recent
CONCORD CONSULTING ENGINEERING PC108/03/2026
NOT APPLICABLE107/31/2026
Building Lifecycle
All (28)Filed (2)Violation (13)Objection (7)Special Inspection (6)
08/19/2026
Objection raised — Other
08/19/2026
Objection resolved — Resolved
08/14/2026
Objection raised — Other
08/14/2026
Objection raised — Other
08/14/2026
Objection raised — Other
08/12/2026
Objection raised — Other
08/12/2026
Objection raised — Other
08/03/2026
Filed — Alteration
AC system installation for a single apartment in 3-apartment building
B01431487-I1
08/01/2026
Special inspection requirement — HVAC-R and service water heating system controls
08/01/2026
Special inspection requirement — HVAC-R and service water piping design and insulation
08/01/2026
Special inspection requirement — HVAC-R and service water heating equipment
08/01/2026
Special inspection requirement — Maintenance information
07/31/2026
Filed — Alteration
Third floor window replacement and cosmetic mansard roof addition.
B01431246-I1
07/15/2026
Special inspection requirement — Mechanical Systems
07/15/2026
Special inspection requirement — Final
11/27/2024
Violation issued (HPD, closed)
I
03/23/2023
Violation issued (HPD, closed)
A
11/09/2022
Violation issued (HPD, closed)
I
02/25/2022
Violation issued (HPD, closed)
I
02/25/2022
Violation issued (HPD, closed)
A
04/09/2021
Violation issued (HPD, closed)
A
04/09/2021
Violation issued (HPD, closed)
I
10/30/2019
Violation issued (HPD, closed)
I
10/18/2018
Violation issued (HPD, closed)
I
11/24/2017
Violation issued (HPD, closed)
I
11/10/2016
Violation issued (HPD, closed)
I
10/09/2015
Violation issued (HPD, closed)
I
02/23/2015
Violation issued (HPD, closed)
I
Nothing on file for this building.
1 project · most recent 08/03/2026
Heating and Air Conditioning Systems
FiledStatusContractorScopeMake / Model / Capacity
08/03/2026——Heating and Air Conditioning Systems
Heat / Cool
Mitsubishi Electric ×4
▾Special Inspection Requirements (DOB NOW) — 6
DateRequirementInspectorRole
08/01/2026HVAC-R and service water heating system controls—energy_progress
08/01/2026HVAC-R and service water piping design and insulation—energy_progress
08/01/2026HVAC-R and service water heating equipment—energy_progress
08/01/2026Maintenance information—energy_progress
07/15/2026Mechanical Systems—special
07/15/2026Final—progress
▾Documents — 6 on file (BIS + DOB NOW)
▸Plans & Drawings2
▸DOB NOWPlans/Sketch2
08/16/2026B01431246-I1Request digital key ↗
08/16/2026B01431487-I1Request digital key ↗
▸Seals & Professional Certifications2
▸DOB NOWDPL-1: Design Professional Seal & Signature2
08/16/2026B01431246-I1Open ↗
08/16/2026B01431487-I1Open ↗
▸Environmental & Asbestos2
▸DOB NOWDEP ACP-5: Asbestos Assessment Report2
08/16/2026B01431246-I1Open ↗
08/16/2026B01431487-I1Open ↗