420 Jefferson Avenue
Brooklyn, NY 11221BBL 3-01836-0009Map
Owner of record: R Squared Developers LLC
420 Jefferson Avenue is a walk-up apartment building built in 1900 in Brooklyn, 11221. It has 4 residential units across 3 floors. The owner of record is R Squared Developers LLC. HPD has recorded 106 housing violations here, most recently on September 3, 2026. 34 of the 50 most recent violations are still open.
- HPD violations
- 106
- DOB violations
- 7
- ECB violations
- 9
- HPD complaints
- 62
What to know
Immediately hazardous issues among recent violations are still open.
Date of the most recent HPD inspection that found a problem.
No balance due on recent ECB violations.
Rent stabilization
No rent-stabilized units in 2018–2024 tax bills
Violations
Most recent first. Showing up to 50 per agency.
HPD housing violations · 106
- BHazardous
Repair the roof so that it will not leak over the ceiling in the kitchen located at apt 4, 4th story, 1st apartment from south at west
Sep 3, 2026 · Apt 4
Open — Nov sent out - BHazardous
Properly repair the source and abate the evidence of a water leak at west wall in the 4th room from north located at apt 4, 4th story, 1st apartment from south at west
Sep 3, 2026 · Apt 4
Open — Nov sent out - BHazardous
Repair the roof so that it will not leak over the ceiling in the 4th room from north located at apt 4, 4th story, 1st apartment from south at west
Sep 3, 2026 · Apt 4
Open — Nov sent out - CImmediately hazardous
Post notice, in form approved by the department, stating the name and location of the person designated by the owner to have key to buildings heating system missing at public hall, 1st story
May 12, 2026
Open — Nov sent out - ANon-hazardous
File with this department a registration statement for building.
May 12, 2026
Open — Nov sent out - ANon-hazardous
§ 329, m/d law and dept. rules and regs. provide a completed certificate of inspection visits in a proper frame at or near mailboxes, bottom edge of frame between 48-62 inches above floor missing at public hall, 1st story
May 12, 2026
Open — Nov sent out - ANon-hazardous
Post a proper notice of carbon monoxide detecting device requirements, in a form approved by commissioner, in a common area of a class a multiple dwelling near inspection certificate or provide notice to tenants in private dwellings missing
May 12, 2026
Open — Nov sent out - ANon-hazardous
Post a proper notice of smoke detector requirements, in a form approved by the commissioner, at or near the mailbox missing at public hall, 1st story
May 12, 2026
Open — Nov sent out - ANon-hazardous
Post and maintain a proper notice on wall of the entrance story in english and spanish on the availability of the agencys housing information guide. a sample notice can be found at www.nyc.gov/hpd. at public hall, 1st story
May 12, 2026
Open — Nov sent out - ANon-hazardous
Post, in a form approved by the commissioner, and maintain a notice in a common area of the building regarding the procedures that should be followed when a gas leak is suspected at public hall
May 12, 2026
Open — Nov sent out
Show 40 more ↓
- CImmediately hazardous
Install the missing or repair/replace the defective window guard(s) in accordance with the specifications of the new york city health code section 24 rcny chapter 12. wg to install = 6, wg to replace = 0, wg to repair = 0 in the entire apartment located at apt 4, 4th story, 1st apartment from south at west
May 12, 2026 · Apt 4
Closed — Violation closed - BHazardous
Properly repair with similar material the broken or defective wood floor in the 1st room from north at west located at apt 4, 4th story, 1st apartment from south at west
May 12, 2026 · Apt 4
Open — Nov sent out - CImmediately hazardous
M/d law abate the nuisance consisting of scalding hot water exceeding the temperature of 130 degrees in the entire apartment located at apt 3, 3rd story, 1st apartment from south at west
May 11, 2026 · Apt 3
Open — Nov sent out - BHazardous
Repair, replace or provide an approved and operational smoke detecting device, installed in accordance with department of buildings rules and regulations missing in the entire apartment located at apt 3, 3rd story, 1st apartment from south at west
May 11, 2026 · Apt 3
Open — Nov sent out - BHazardous
Repair, replace or provide an approved and operational carbon monoxide detecting device, installed in accordance with applicable law and rules missing in the entire apartment located at apt 3, 3rd story, 1st apartment from south at west
May 11, 2026 · Apt 3
Open — Nov sent out - BHazardous
Properly repair or replace the broken or defective light fixture at ceiling in the bathroom located at apt 4, 3rd story, 1st apartment from south at west
May 1, 2026 · Apt 4
Open — Nov sent out - ANon-hazardous
Paint with light colored paint to the satisfaction of this department all peeling paint surfaces in the 1st room from north at east, the kitchen , the 4th room from north located at apt 4, 3rd story, 1st apartment from south at west
May 1, 2026 · Apt 4
Open — Nov sent out - BHazardous
Properly repair the source and abate the evidence of a water leak at south wall in the 1st room from north at east located at apt 4, 3rd story, 1st apartment from south at west
May 1, 2026 · Apt 4
Open — Nov sent out - BHazardous
Properly repair the source and abate the evidence of a water leak at ceiling in the kitchen located at apt 4, 3rd story, 1st apartment from south at west
May 1, 2026 · Apt 4
Open — Nov sent out - BHazardous
Properly repair the source and abate the evidence of a water leak at west wall in the 4th room from north located at apt 4, 3rd story, 1st apartment from south at west
May 1, 2026 · Apt 4
Open — Nov sent out - BHazardous
Properly repair the source and abate the evidence of a water leak at ceiling in the 4th room from north located at apt 4, 3rd story, 1st apartment from south at west
May 1, 2026 · Apt 4
Open — Nov sent out - CImmediately hazardous
Remove device preventing door from being self-closing kick stand door stopper installed at building entrance door , 1st story
May 1, 2026
Closed — Violation closed - IInformation / order
And is therefore subject to civil penalties, prohibited from certifying violations, and denied the right to recover possession of premises for nonpayment of rent until a valid registration statement is filed.
Nov 19, 2025
Closed — Violation dismissed - BHazardous
Properly repair the source and abate the evidence of a water leak at 1st window frame from east at south in the 4th room from north at east located at apt 1, 1st story, 1st apartment from south at west
Nov 6, 2025 · Apt 1
Open — Nov sent out - BHazardous
Properly repair the source and abate the evidence of a water leak at 1st door frame from east at south in the 4th room from north at east located at apt 1, 1st story, 1st apartment from south at west
Nov 6, 2025 · Apt 1
Open — Nov sent out - ANon-hazardous
File annual bedbug report in accordance with hpd rule as described on the back of this notice of violation or as described on hpds website, www.nyc.gov\hpd, search bed bugs.
Jun 10, 2025
Closed — Violation dismissed - ANon-hazardous
Trace and repair the source and abate the visible mold condition... less than 10 sq.ft at ceiling in the bathroom located at apt 3, 3rd story, 1st apartment from south at west
Feb 6, 2025 · Apt 3
Closed — Violation closed - CImmediately hazardous
M/d law abate the nuisance consisting of hot water exceeds the maximum allowable temperature of 130 degrees in the entire apartment located at apt 3, 3rd story, 1st apartment from south at west
Feb 6, 2025 · Apt 3
Open — Nov sent out - BHazardous
Trace and repair the source and abate the visible mold condition... less than 10 sq.ft at ceiling in the bathroom located at apt 3, 3rd story, 1st apartment from south at west original violation 17674989 issued 06-feb-25 has been upgraded to class b per administrative code §27-2017.3a(3)(a) or (b).
Feb 6, 2025 · Apt 3
Open — First no access to re- inspect violation - IInformation / order
And is therefore subject to civil penalties, prohibited from certifying violations, and denied the right to recover possession of premises for nonpayment of rent until a valid registration statement is filed.
Nov 27, 2024
Closed — Violation dismissed - ANon-hazardous
Repair the broken or defective plastered surfaces and paint in a uniform color the east wall and ceiling in the 1st room from north located at apt 4, 3rd story, 1st apartment from south at west
Aug 3, 2024 · Apt 4
Closed — Violation dismissed - ANon-hazardous
Repair the broken or defective plastered surfaces and paint in a uniform color the ceiling and south wall in the 3rd room from north located at apt 4, 3rd story, 1st apartment from south at west
Aug 3, 2024 · Apt 4
Closed — Violation dismissed - ANon-hazardous
File annual bedbug report in accordance with hpd rule as described on the back of this notice of violation or as described on hpds website, www.nyc.gov\hpd, search bed bugs.
Apr 10, 2024
Closed — Violation dismissed - ANon-hazardous
Post, in a form approved by the commissioner, and maintain a notice in a common area of the building regarding the procedures that should be followed when a gas leak is suspected
Dec 20, 2023
Closed — Violation dismissed - ANon-hazardous
Post a proper notice of smoke detector requirements, in a form approved by the commissioner, at or near the mail box missing
Dec 20, 2023
Closed — Violation dismissed - ANon-hazardous
Post and maintain a proper sign on wall of entrance story showing the registration number assigned by the department and the address of the building.
Dec 20, 2023
Closed — Violation dismissed - ANon-hazardous
§ 329, m/d law and dept. rules and regs. provide a completed certificate of inspection visits in a proper frame at or near mailboxes, bottom edge of frame between 48-62 inches above floor missing
Dec 20, 2023
Closed — Violation dismissed - ANon-hazardous
Post and maintain a proper notice on wall of the entrance story in english and spanish on the availability of the agencys housing information guide. a sample notice can be found at www.nyc.gov/hpd.
Dec 20, 2023
Closed — Violation dismissed - CImmediately hazardous
Post notice, in form approved by the department, stating the name and location of the person designated by the owner to have key to buildings heating system missing
Dec 20, 2023
Open — Nov sent out - ANon-hazardous
Post a proper notice of carbon monoxide detecting device requirements, in a form approved by the commissioner, in a common area of a class a multiple dwelling near inspection certificate or provide notice to tenants in a private dwelling.
Dec 20, 2023
Closed — Violation dismissed - IInformation / order
And is therefore subject to civil penalties, prohibited from certifying violations, and denied the right to recover possession of premises for nonpayment of rent until a valid registration statement is filed.
Nov 21, 2023
Closed — Violation dismissed - ANon-hazardous
Post and maintain a proper sign on wall of entrance story showing the registration number assigned by the department and the address of the building. at public hall, 1st story
Oct 18, 2023
Open — Nov sent out - ANon-hazardous
Post sign on wall of entrance story bearing name, address including apartment number if any, and telephone number of superintendent, janitor or housekeeper. at public hall, 1st story
Oct 18, 2023
Open — Nov sent out - ANon-hazardous
Post a proper notice of smoke detector requirements, in a form approved by the commissioner, at or near the mail box missing at public hall, 1st story
Oct 18, 2023
Open — Nov sent out - ANon-hazardous
Post a proper notice of carbon monoxide detecting device requirements, in a form approved by the commissioner, in a common area of a class a multiple dwelling near inspection certificate or provide notice to tenants in a private dwelling.
Oct 18, 2023
Open — Nov sent out - CImmediately hazardous
Post notice, in form approved by the department, stating the name and location of the person designated by the owner to have key to buildings heating system missing at public hall, 1st story
Oct 18, 2023
Open — Nov sent out - ANon-hazardous
§ 329, m/d law and dept. rules and regs. provide a completed certificate of inspection visits in a proper frame at or near mailboxes, bottom edge of frame between 48-62 inches above floor missing at public hall, 1st story
Oct 18, 2023
Open — Nov sent out - BHazardous
Remove all encumbrances consisting of house hold items and strollers at public hall, 1st story
Oct 18, 2023
Open — Nov sent out - BHazardous
Remove all encumbrances consisting of bicycle at public hall, 1st story
Oct 18, 2023
Open — Nov sent out - BHazardous
Properly repair the source and abate the evidence of a water leak at east wall and ceiling at public hall, 2nd story
Oct 18, 2023
Open — Nov sent out
DOB building violations · 7
- Fail to certify class 1 none
Failure to certify correction on immediately hazardous (class 1) ecb violation
Jul 9, 2019
Dob violation - dismissed - Construction other optional
C-construction other optional
Aug 23, 2016
Dob violation - dismissed - Construction other optional
C-construction other optional
Aug 22, 2016
Dob violation - dismissed - Boilers boiler required
Ll6291-local law 62/91 - boilers boiler required
Aug 29, 1995
Dob violation - dismissed - Boilers boiler required
Ll6291-local law 62/91 - boilers boiler required
Jun 1, 1994
Dob violation - dismissed - Boilers boiler required
Ll6291-local law 62/91 - boilers boiler required
Aug 16, 1993
Dob violation - active - Boilers boiler required
Ll6291-local law 62/91 - boilers boiler required
Jun 1, 1993
Dob violation - dismissed
ECB violations · 9
- Class - 1
At time of inspection observed excavation performing approximately 5'ft and 6"deep x 25' linear at backyard without dob job permit. causing hazard condition to adjacent properties., obtain permit
Oct 28, 2021
Resolve - Class - 1
Failure to institute/maintain safety equipment measures or temporary construction-no guard rail. at time of inspection observed site super on site. active permit#321614945-01-nb posted guard rail was missing an
Oct 8, 2020 · Penalty $2,500
Resolve - Class - 2
Job site fence not constructed or maintained pursuant to subsection. at time of inspection observed site superintendent on site. active permit#321614945-01-nb posted observed the site fence at exposure#1 is in
Oct 8, 2020
Resolve - Class - 2
Sidewalk shed /pedestrian protection does not meet code specificationsat time of inspection of a 4 story nb i osereved approx.30feet of sidewalk,shed at exp#1 was not provided with lighting as required on under
Nov 25, 2019 · Penalty $2,400
Resolve - Class - 2
Sidewalk shed does not meet code compliance note: @the time of my inspection of a 4sty building, i observed approx 30 ft of sidewalk shed erected @exp one i also observed that there was no lighting in place as
Oct 26, 2019 · Penalty $2,400
Resolve - Class - 1
Bc 107.7.1 foundation plans. note:at the time of my inspection of a 4 story building at excavation phase site closed. i observed drawings a-003.00 section transversal a-a is missing the information of the mater
Apr 12, 2019
Resolve - Class - 1
Failure to notify the dept prior to the commencement of earthwork. note:at the time of my inspection of a 4 story building at excavation phase site closed. i observed that earthwork operation had commence and r
Apr 12, 2019 · Penalty $2,500
Resolve - Class - 1
Bc 3309.9 weatherproof integrity of adjoining building. note:at the time of my inspection of a 4 story building at excavation phase site closed. i observed excavation had commence requiring the removal of soil
Apr 12, 2019 · Penalty $2,500
Resolve - Class - 2
Failure to post or properly post permit for work at premises. at time of my inspection:on an active job site at excavation level a 8ft fenceon site w/ no dob # permit post at job site as require by dob. failure
Apr 2, 2019
Resolve
Complaints
- Water leak
Damp spot
Oct 21, 2026 · Apt 4
Open - Unsanitary condition
Mold
Oct 21, 2026 · Apt 4
Open - Water leak
Slow leak
Oct 21, 2026 · Apt 4
Open - Safety
Smoke detector
Oct 21, 2026 · Apt 4
Open - Electric
Lighting
Oct 21, 2026 · Apt 4
Open - Electric
Outlet/switch
Oct 21, 2026 · Apt 4
Open - Paint/plaster
Ceiling
Oct 21, 2026 · Apt 4
Open - Unsanitary condition
Mold
Sep 2, 2026 · Apt 4
Close - Water leak
Slow leak
Sep 2, 2026 · Apt 4
Close - Outside building
Roof door/hatch
Jun 2, 2026 · Apt PH
Close
Show 40 more ↓
- Plumbing
Water supply
May 11, 2026 · Apt 4
Close - Unsanitary condition
Pests
May 11, 2026 · Apt 4
Close - Unsanitary condition
Pests
May 11, 2026 · Apt 4
Close - Safety
Window guard broken/missing
May 11, 2026 · Apt 4
Close - Plumbing
Water supply
May 11, 2026 · Apt 36
Close - Safety
Smoke detector
May 11, 2026 · Apt 3
Close - Safety
Carbon monoxide detector
May 11, 2026 · Apt 3
Close - Water leak
Damp spot
Apr 29, 2026 · Apt 4
Close - Paint/plaster
Window/frame
Apr 29, 2026 · Apt 4
Close - Water leak
Slow leak
Apr 29, 2026 · Apt 4
Close - Water leak
Heavy flow
Oct 30, 2025 · Apt 1
Close - Plumbing
Water supply
Feb 6, 2025 · Apt 3
Close - Plumbing
Water supply
Feb 6, 2025 · Apt 3
Close - Unsanitary condition
Mold
Feb 6, 2025 · Apt 3
Close - Outside building
Roofing
Feb 6, 2025 · Apt BLDG
Close - Outside building
Roof door/hatch
Feb 6, 2025 · Apt BLDG
Close - Unsanitary condition
Garbage/recycling storage
Feb 6, 2025 · Apt BLDG
Close - Water leak
Slow leak
Aug 18, 2024 · Apt 4
Close - Heat/hot water
Apartment only
Feb 25, 2024 · Apt 4
Close - Heat/hot water
Apartment only
Feb 23, 2024 · Apt 4
Close - Heat/hot water
Apartment only
Feb 19, 2024 · Apt APT4
Close - Heat/hot water
Apartment only
Jan 4, 2024 · Apt 2
Close - Unsanitary condition
Mold
Oct 23, 2023 · Apt 4
Close - Water leak
Slow leak
Aug 24, 2023 · Apt 4
Close - Water leak
Damp spot
Aug 24, 2023 · Apt 4
Close - Water leak
Heavy flow
Aug 24, 2023 · Apt 4
Close - General
Cooking gas
Oct 14, 2016 · Apt BLDG
Close - Heat/hot water
Entire building
Oct 14, 2016 · Apt BLDG
Close - Heat/hot water
Entire building
Oct 14, 2016 · Apt BLDG
Close - Nonconst
Smoke detector
Jul 24, 2012 · Apt BB
Close - Nonconst
Carbon monoxide
Jul 24, 2012 · Apt BB
Close - General
Ventilation system
Jul 24, 2012 · Apt BB
Close - General
Ventilation system
Jul 24, 2012 · Apt BB
Close - General
Fire-escape
Jul 24, 2012 · Apt BB
Close - General
Doors
Jul 24, 2012 · Apt 4C
Close - Paint/plaster
Wall
Jul 24, 2012 · Apt 4C
Close - General
Locks
Jul 24, 2012 · Apt 4C
Close - Heating
Heat related
Feb 14, 2008 · Apt 2
Close - Heating
Heat related
Feb 12, 2008 · Apt 2
Close - Heating
Heat related
Feb 8, 2008 · Apt 2
Close
Sales history
No recorded sales in our data
Building details
- Building type
- Walk-up apartment building (C3)
- Year built
- 1900
- Floors
- 3
- Residential units
- 4
- Building area
- 3,556 ft²
- Lot area
- 1,800 ft²
- Zoning
- R6B
- Community board
- 303
- Council district
- 36
- Block / lot
- 1836 / 9
- Assessed value
- $453,150
- Landmark / historic district
- No
HPD registration #345115, last renewed Dec 3, 2025.
Questions about 420 Jefferson Avenue
Who owns 420 Jefferson Avenue?
The owner of record in NYC Department of City Planning PLUTO data is R Squared Developers LLC.
Does 420 Jefferson Avenue have violations?
Yes. NYC HPD has recorded 106 housing violations at this property.
Is 420 Jefferson Avenue rent stabilized?
No rent-stabilized units appear in its 2018–2024 tax bills. Individual apartments can still be regulated, so request the rent history from NYS Homes and Community Renewal if unsure.
When was 420 Jefferson Avenue built?
City records list 1900 as the year it was built.
How many apartments are in 420 Jefferson Avenue?
It has 4 residential units.
Source: NYC Open Data (DCP PLUTO, HPD, DOB, ECB/OATH, DOF). Records can lag the city's systems. Data refreshed weekly.