roofy
Post

423 Throop Avenue

Brooklyn, NY 11221BBL 3-01806-0006Map

Owner of record: Throop Investors One LLC

423 Throop Avenue is a walk-up apartment building built in 1931 in Brooklyn, 11221. It has 6 residential units across 3 floors. The owner of record is Throop Investors One LLC. HPD has recorded 276 housing violations here, most recently on May 6, 2026. 41 of the 50 most recent violations are still open. City tax records listed 7 rent-stabilized apartments here in 2024.

HPD violations
276
DOB violations
28
ECB violations
10
HPD complaints
283

What to know

Concern
13 open Class C

Immediately hazardous issues among recent violations are still open.

Good
Last violation May 6, 2026

Date of the most recent HPD inspection that found a problem.

Good
No unpaid ECB fines

No balance due on recent ECB violations.

Rent stabilization

Rent-stabilized units in 2024
7
About 100% of the building's 6 apartments

Counts come from owners' rent-stabilization filings shown on NYC Department of Finance tax bills, as extracted by JustFix. They tell you a building has stabilized apartments, not which ones.

Stabilized units by tax-bill year

Think your apartment is stabilized? Request its rent history from HCR (free), then check your renewal with the renewal calculator.

Violations

Most recent first. Showing up to 50 per agency.

HPD housing violations · 276

  • A

    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.

    May 6, 2026

    Closed — Violation dismissed
  • A

    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 11, 2025

    Closed — Violation dismissed
  • A

    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 12, 2024

    Closed — Violation dismissed
  • I

    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
  • B

    Repair or replace the smoke detector missing in the entire apartment located at apt 3r, 3rd story, 1st apartment from west at north

    Nov 14, 2023 · Apt 3R

    Open — Nov sent out
  • B

    Repair or replace the carbon monoxide detecting device(s). missing in the entire apartment located at apt 3r, 3rd story, 1st apartment from west at north

    Nov 14, 2023 · Apt 3R

    Open — Nov sent out
  • A

    Properly repair with similar material the broken or defective fire retardant plaster at south wall and ceiling between front entrance and vestibule door at public hall, 1st story

    Nov 8, 2023

    Open — Nov sent out
  • A

    Paint with light colored paint to the satisfaction of this department at south wall and ceiling, between front entrance and vestibule door at public hall, 1st story

    Nov 8, 2023

    Open — Nov sent out
  • A

    Properly repair the source and abate the evidence of a water leak at ceiling and south wall at vestibule at public hall, 1st story

    Nov 8, 2023

    Open — Nov sent out
  • C

    Provide ready access to buildings heating system locked door at boiler room, 1st story

    Nov 8, 2023

    Open — Nov sent out
Show 40 more ↓
  • C

    Provide hot water at all hot water fixtures in the 2nd room from east located at apt 2l, 2nd story, 1st apartment from south at west

    Nov 8, 2023 · Apt 2L

    Open — Nov sent out
  • C

    Provide an adequate supply of heat for the apartment in the 2nd room from east located at apt 2l, 2nd story, 1st apartment from south at west

    Nov 8, 2023 · Apt 2L

    Open — Nov sent out
  • B

    Repair the roof so that it will not leak at ceiling in the bathroom located at apt 3r, 3rd story, 2nd apartment from south at west

    Oct 20, 2023 · Apt 3R

    Open — Nov sent out
  • B

    Repair the roof so that it will not leak at ceiling in the 5th room from east located at apt 3r, 3rd story, 2nd apartment from south at west

    Oct 20, 2023 · Apt 3R

    Open — Nov sent out
  • A

    Repair the broken or defective plastered surfaces and paint in a uniform color at ceiling in the 5th room from east located at apt 3r, 3rd story, 2nd apartment from south at west

    Oct 20, 2023 · Apt 3R

    Open — Nov sent out
  • A

    Repair the broken or defective plastered surfaces and paint in a uniform color at north wall and ceiling in the 4th room from east located at apt 3r, 3rd story, 2nd apartment from south at west

    Oct 20, 2023 · Apt 3R

    Open — Nov sent out
  • A

    Repair the broken or defective plastered surfaces and paint in a uniform color at ceiling in the bathroom located at apt 3r, 3rd story, 2nd apartment from south at west

    Oct 20, 2023 · Apt 3R

    Open — Nov sent out
  • B

    Repair or replace the carbon monoxide detecting device(s). missing in the entire apartment located at apt 3r, 3rd story, 2nd apartment from south at west

    Oct 20, 2023 · Apt 3R

    Open — Nov sent out
  • B

    Repair or replace the smoke detector missing in the entire apartment located at apt 3r, 3rd story, 2nd apartment from south at west

    Oct 20, 2023 · Apt 3R

    Open — Nov sent out
  • B

    Repair the roof so that it will not leak at north wall and ceiling in the 4th room from east located at apt 3r, 3rd story, 2nd apartment from south at west

    Oct 20, 2023 · Apt 3R

    Open — Nov sent out
  • A

    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.

    Mar 27, 2023

    Closed — Violation dismissed
  • I

    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 10, 2022

    Closed — Violation dismissed
  • A

    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.

    Mar 2, 2022

    Closed — Violation dismissed
  • B

    Replace with new the missing vestibule door at public hall, 1st story

    Oct 19, 2020

    Open — Nov sent out
  • I

    Apts have been vacated by this department and cannot be reoccupied until so ordered after proof of compliance for apts vacate #155998 (apt #5 2nd sty north 1)

    Sep 16, 2020

    Open — Info nov sent out
  • I

    Apts have been vacated by this department and cannot be reoccupied until so ordered after proof of compliance for apts vacate #155998 (apt #3 1st sty north 1)

    Sep 16, 2020

    Open — Info nov sent out
  • C

    M/d law abate the nuisance consisting of fire damage in the entire apartment located at apt 5, 2nd story, 1st apartment from west at north

    Aug 31, 2020 · Apt 5

    Open — Nov sent out
  • C

    M/d law abate the nuisance consisting of fire damage in the entire apartment located at apt 3, 1st story, 1st apartment from west at north

    Aug 31, 2020 · Apt 3

    Open — Nov sent out
  • B

    Repair the broken or defective plastered surfaces and paint in a uniform color at ceiling in the 2nd room from north located at apt 2, 1st story, 2nd apartment from west at north

    Aug 31, 2020 · Apt 2

    Closed — Violation dismissed
  • B

    Replace with new the missing door in the bathroom located at apt 5, 2nd story, 2nd apartment from north at east

    Sep 7, 2019 · Apt 5

    Open — Nov sent out
  • B

    Repair the broken or defective connection at the waste pipe under the wash basin in the bathroom located at apt 5, 2nd story, 1st apartment from north at east

    Sep 7, 2019 · Apt 5

    Open — Nov sent out
  • B

    Remove all obstructions and repair all defects in the waste pipe at the wash basin in the bathroom located at apt 5, 2nd story, 1st apartment from north at east

    Sep 7, 2019 · Apt 5

    Open — Nov sent out
  • B

    Properly repair with similar material the broken or defective ceramic floor tiles in the bathroom located at apt 5, 2nd story, 1st apartment from north at east

    Sep 7, 2019 · Apt 5

    Open — Nov sent out
  • B

    Replace with new the missing wall and sink base cabinets at the west wall in the kitchen located at apt 5, 2nd story, 2nd apartment from north at east

    Sep 7, 2019 · Apt 5

    Open — Nov sent out
  • B

    Replace the broken or defective sink (missing) in the kitchen located at apt 5, 2nd story, 2nd apartment from north at east

    Sep 7, 2019 · Apt 5

    Open — Nov sent out
  • B

    Repair or replace the carbon monoxide detecting device(s). missing located at apt 5, 2nd story, 2nd apartment from north at east

    Sep 7, 2019 · Apt 5

    Open — Nov sent out
  • B

    Repair or replace the smoke detector missing located at apt 5, 2nd story, 2nd apartment from north at east

    Sep 7, 2019 · Apt 5

    Open — Nov sent out
  • B

    Replace with new the broken or defective glass pane at the lower sash at the window to fire escape in the 1st room from east located at apt 5, 2nd story, 2nd apartment from north at east

    Sep 7, 2019 · Apt 5

    Open — Nov sent out
  • B

    Provide adequate lighting at or near the outside of the front entranceway of the building and keep same burning from sunset every day to sunrise on the day following a minimum of 100 watts of incandescent light required. at front areaway

    Aug 28, 2019

    Open — Nov sent out
  • I

    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.

    Oct 22, 2018

    Closed — Violation dismissed
  • C

    Provide hot water at all hot water fixtures in the entire apartment located at apt 6, 2nd story, 2nd apartment from north at east

    Sep 11, 2018 · Apt 6

    Open — Nov sent out
  • B

    Properly repair with similar material the broken or defective vinyl tiles at floor in the private hallway located at apt 6, 2nd story, 2nd apartment from north at east

    Sep 11, 2018 · Apt 6

    Open — Nov sent out
  • C

    Properly repair the broken or defective at floor in the kitchen located at apt 6, 2nd story, 2nd apartment from north at east

    Sep 11, 2018 · Apt 6

    Open — Nov sent out
  • C

    Properly repair with similar material the broken or defective ceramic tiles at north wall in the bathroom located at apt 6, 2nd story, 2nd apartment from north at east

    Sep 11, 2018 · Apt 6

    Open — Nov sent out
  • C

    Properly repair and abate unsafe electric wiring condition consisting of switch at north wall in the kitchen located at apt 6, 2nd story, 2nd apartment from north at east

    Sep 11, 2018 · Apt 6

    Open — Nov sent out
  • C

    Provide an adequate supply of gas to the fixtures at range in the kitchen located at apt 6, 2nd story, 2nd apartment from north at east

    Sep 11, 2018 · Apt 6

    Open — Nov sent out
  • C

    Provide ready access to buildings heating system door locked at cellar

    Sep 11, 2018

    Open — Nov sent out
  • C

    Provide hot water at all hot water fixtures in the entire apartment located at apt 1r2, 1st story, 2nd apartment from south at west

    Aug 31, 2018 · Apt 1R2

    Open — Nov sent out
  • C

    Provide an adequate supply of gas to the fixtures at range in the kitchen located at apt 1r2, 1st story, 2nd apartment from north at east

    Aug 31, 2018 · Apt 1R2

    Open — Nov sent out
  • A

    Paint with light colored paint to the satisfaction of this department at ceiling and east , west , north and south walls in the bathroom located at apt 1r2, 1st story, 2nd apartment from north at east

    Aug 31, 2018 · Apt 1R2

    Open — Nov sent out

DOB building violations · 28

  • Low pressure boiler boiler required

    Violation issued-failure to file 2024 external low pressure inspection

    Nov 14, 2025

    Dob violation - active
  • Low pressure boiler boiler required

    Violation issued-failure to file 2023 external low pressure inspection

    Sep 23, 2024

    Dob violation - active
  • Low pressure boiler boiler required

    Violation issued-failure to file 2021 external low pressure inspection

    Jun 30, 2023

    Dob violation - active
  • Low pressure boiler boiler required

    Violation issued-failure to file 2022 external low pressure inspection

    Apr 25, 2023

    Dob violation - active
  • Low pressure boiler boiler required

    Violation issued for failure to file annual boiler 2017 inspection report

    Nov 8, 2019

    Dob violation - active
  • Low pressure boiler boiler required

    Violation issued for failure to file annual boiler 2016 inspection report

    Apr 6, 2018

    Dob violation - active
  • Low pressure boiler boiler required

    Violation issued for failure to file annual boiler 2015 inspection report

    Feb 24, 2017

    Dob violation - active
  • Low pressure boiler boiler required

    Violation issued for failure to file annual boiler 2014 inspection report

    Oct 1, 2015

    Dob violation - active
  • Low pressure boiler boiler required

    Violation issued for failure to file annual boiler 2013 inspection report

    Mar 3, 2015

    Dob violation - active
  • Low pressure boiler boiler required

    Violation issued for failure to file annual boiler 2012 inspection report

    May 15, 2014

    Dob violation - active
Show 18 more ↓
  • Low pressure boiler boiler required

    Violation issued for failure to file annual boiler 2011 inspection report

    Mar 1, 2013

    Dob violation - active
  • Low pressure boiler boiler required

    Violation issued for failure to file annual boiler 2010 inspection report

    Dec 13, 2011

    Dob violation - active
  • Low pressure boiler boiler required

    Lblvio-low pressure boiler boiler required

    Dec 31, 2009

    Dob violation - active
  • Boilers boiler required

    Ll6291-local law 62/91 - boilers boiler required

    Jan 1, 2009

    Dob violation - active
  • Boilers boiler required

    Ll6291-local law 62/91 - boilers boiler required

    Jan 3, 2008

    Dob violation - active
  • Boilers boiler required

    Ll6291-local law 62/91 - boilers boiler required

    Jan 19, 2007

    Dob violation - active
  • Boilers boiler required

    Ll6291-local law 62/91 - boilers boiler required

    Jan 6, 2006

    Dob violation - active
  • Boilers boiler required

    Ll6291-local law 62/91 - boilers boiler required

    Feb 13, 2004

    Dob violation - active
  • Boilers boiler required

    Ll6291-local law 62/91 - boilers boiler required

    Mar 19, 2003

    Dob violation - active
  • Boilers boiler required

    Ll6291-local law 62/91 - boilers boiler required

    Mar 26, 2002

    Dob violation - active
  • Boilers boiler required

    Ll6291-local law 62/91 - boilers boiler required

    Feb 27, 2001

    Dob violation - active
  • Boilers boiler required

    Ll6291-local law 62/91 - boilers boiler required

    Feb 7, 2000

    Dob violation - active
  • Boilers boiler required

    Ll6291-local law 62/91 - boilers boiler required

    Mar 16, 1999

    Dob violation - active
  • Boilers boiler required

    Ll6291-local law 62/91 - boilers boiler required

    May 4, 1998

    Dob violation - active
  • Boilers boiler required

    Ll6291-local law 62/91 - boilers boiler required

    Sep 16, 1997

    Dob violation - active
  • Boilers boiler required

    Ll6291-local law 62/91 - boilers boiler required

    Feb 10, 1997

    Dob violation - active
  • Boilers boiler required

    Ll6291-local law 62/91 - boilers boiler required

    Aug 29, 1995

    Dob violation - active
  • Boilers boiler required

    Ll6291-local law 62/91 - boilers boiler required

    Aug 16, 1993

    Dob violation - active

ECB violations · 10

  • Class - 2

    Holes in walls and ceiling as per bc 509.1,509.4.1 no manual reset lwco as per mc 1007.2/asme csd-1 missing combustion air in boiler rm mc 701.2

    Mar 22, 2021 · Penalty $3,125

    Active
  • Class - 2

    B265 as per class 2 (b265) 28-303.7 failure to file a complete boilerinspection report as per dob records. submit a current b09 report.

    Apr 11, 2017 · Penalty $2,500

    Active
  • Class - 3

    Failure to maintain building in code-complaint manner. noted: 3 stories multiple dwelling building found with broken window. water (coming) in to apt damaging paint (peeling of) & sheetrock around the window

    Feb 26, 2010 · Penalty $500

    Active
  • Class - 1

    Occupancy contrary to that allowed by cofo & dob recods.bldg convertedfrom 3story-6class "a" apts,into 3stry 12-units.rem:discontinue illegal use of amended cofo

    Dec 9, 2009 · Penalty $12,000

    Active
  • Class - 2

    Failure to maintain building walls,or appurtenances. noted: observed cracks in exterior building walls. remedy: maintain building walls.

    May 8, 2009 · Penalty $2,500

    Active
  • Class - 1

    Sec. 28-201.1 failure to comply with comm-order to obtain a permit perviolation #34707825p work done on property w/o a permit. remedy: correct violation #34707825p.

    May 8, 2009 · Penalty $8,000

    Active
  • Class - 1

    Failure to maintain bldg in code compliant manner use of prohibted door and or hardware per 1008.1.8;27-37 noted opening roof hatch has been boarded and sealed obstructing access to roof via scuttle ladder @ 1

    Oct 14, 2008 · Penalty $5,000

    Active
  • Class - 1

    Occupancy contrary to that allowed by the c of o 84015 issued 9/16/1937 noted 3rd fl apts has been subdivided 2 additional class a apt contrary to c of o on file indicating 2 apt at 3rd fl remedy: discontinue

    Oct 10, 2008 · Penalty $12,000

    Active
  • Class - 1

    Work w/o a permit work noted: full height partitions erected subdividing 3rd fl apart(s) w/ kitchen and gas stove and 3pc bthrm w/ vanity water closet and shower for apart located at read. remedy: obtain a perm

    Oct 10, 2008 · Penalty $8,000

    Active
  • Class - 1

    Occupancy contrary to that allowed by c of o and dob records. 3 story 6 class a apts converted into 3 story 12 class a apt bldg thruout intoremedy: discontinue illegal use of amended c of o.

    Oct 9, 2008 · Penalty $12,000

    Active

Complaints

  • Water leak

    Damp spot

    Oct 14, 2024 · Apt 1R1

    Close
  • Water leak

    Slow leak

    Oct 14, 2024 · Apt 1R1

    Close
  • Unsanitary condition

    Mold

    Oct 14, 2024 · Apt 1R1

    Close
  • Heat/hot water

    Apartment only

    Nov 29, 2023 · Apt FIRSTF

    Close
  • Heat/hot water

    Apartment only

    Nov 29, 2023 · Apt 2

    Close
  • Unsanitary condition

    Pests

    Nov 16, 2023 · Apt 3R

    Close
  • Heat/hot water

    Entire building

    Nov 11, 2023 · Apt 3L

    Close
  • Heat/hot water

    Entire building

    Nov 8, 2023 · Apt BLDG

    Close
  • Heat/hot water

    Entire building

    Oct 31, 2023 · Apt BLDG

    Close
  • Heat/hot water

    Entire building

    Oct 19, 2023 · Apt BLDG

    Close
Show 40 more ↓
  • Water leak

    Slow leak

    Oct 3, 2023 · Apt 3R

    Close
  • Door/window

    Door

    Aug 7, 2023 · Apt 4

    Close
  • Door/window

    Door

    Aug 7, 2023 · Apt 2

    Close
  • General

    Cooking gas

    Nov 24, 2020 · Apt 4

    Close
  • Heat/hot water

    Entire building

    Nov 24, 2020 · Apt 4

    Close
  • Unsanitary condition

    Pests

    Sep 27, 2019 · Apt 2R3

    Close
  • Door/window

    Door

    Aug 28, 2019 · Apt 5

    Close
  • Plumbing

    Basin/sink

    Aug 28, 2019 · Apt 5

    Close
  • Appliance

    Electric/gas range

    Aug 28, 2019 · Apt 5

    Close
  • Appliance

    Refrigerator

    Aug 28, 2019 · Apt 5

    Close
  • Safety

    Window guard broken/missing

    Aug 15, 2019 · Apt 3R2

    Close
  • Door/window

    Door

    Aug 15, 2019 · Apt 1C

    Close
  • Safety

    Carbon monoxide detector

    Aug 15, 2019 · Apt 3R1

    Close
  • Safety

    Smoke detector

    Aug 15, 2019 · Apt 3R1

    Close
  • Unsanitary condition

    Mold

    Aug 15, 2019 · Apt 1C

    Close
  • Safety

    Window guard broken/missing

    Aug 15, 2019 · Apt 3R2

    Close
  • Safety

    Smoke detector

    Aug 15, 2019 · Apt 3R2

    Close
  • Safety

    Carbon monoxide detector

    Aug 15, 2019 · Apt 3R2

    Close
  • Appliance

    Refrigerator

    Jun 3, 2019 · Apt 1R

    Close
  • Plumbing

    Bathtub/shower

    Jun 3, 2019 · Apt 1R

    Close
  • Appliance

    Electric/gas range

    Oct 15, 2018 · Apt 6

    Close
  • Heat/hot water

    Apartment only

    Oct 15, 2018 · Apt 6

    Close
  • Heat/hot water

    Entire building

    Sep 25, 2018 · Apt 1R1

    Close
  • Heat/hot water

    Entire building

    Sep 5, 2018 · Apt 6

    Close
  • Appliance

    Electric/gas range

    Aug 26, 2018 · Apt F1

    Close
  • Heat/hot water

    Entire building

    Aug 26, 2018 · Apt F1

    Close
  • Plumbing

    Toilet

    Aug 21, 2018 · Apt 6

    Close
  • Electric

    Wiring

    Aug 21, 2018 · Apt 6

    Close
  • Plumbing

    Bathtub/shower

    Aug 21, 2018 · Apt 6

    Close
  • Appliance

    Electric/gas range

    Aug 21, 2018 · Apt 6

    Close
  • Paint/plaster

    Wall

    Aug 21, 2018 · Apt 6

    Close
  • Heat/hot water

    Entire building

    Aug 21, 2018 · Apt 6

    Close
  • Plumbing

    Water supply

    Aug 20, 2018 · Apt 1R2

    Close
  • General

    Cooking gas

    Aug 20, 2018 · Apt 1R2

    Close
  • Water leak

    Heavy flow

    Aug 20, 2018 · Apt 1R2

    Close
  • General

    Cooking gas

    Aug 12, 2018 · Apt 6

    Close
  • Heat/hot water

    Entire building

    Aug 12, 2018 · Apt 6

    Close
  • General

    Cooking gas

    Aug 11, 2018 · Apt 1R2

    Close
  • Heat/hot water

    Apartment only

    Aug 11, 2018 · Apt 1R2

    Close
  • Water leak

    Slow leak

    Aug 11, 2018 · Apt 1R2

    Close

Sales history

No recorded sales in our data

Sales come from the NYC Department of Finance rolling sales file.

Building details

Building type
Walk-up apartment building (C2)
Year built
1931
Floors
3
Residential units
6
Building area
4,875 ft²
Lot area
2,500 ft²
Zoning
R6B
Community board
303
Council district
36
Block / lot
1806 / 6
Assessed value
$427,050
Landmark / historic district
No

HPD registration #362483, last renewed Aug 14, 2025.

Questions about 423 Throop Avenue

Who owns 423 Throop Avenue?

The owner of record in NYC Department of City Planning PLUTO data is Throop Investors One LLC.

Does 423 Throop Avenue have violations?

Yes. NYC HPD has recorded 276 housing violations at this property.

Is 423 Throop Avenue rent stabilized?

NYC Department of Finance tax bills listed 7 rent-stabilized units here in 2024 (about 100% of its 6 apartments). To confirm a specific apartment, request its rent history from NYS Homes and Community Renewal.

When was 423 Throop Avenue built?

City records list 1931 as the year it was built.

How many apartments are in 423 Throop Avenue?

It has 6 residential units.

Source: NYC Open Data (DCP PLUTO, HPD, DOB, ECB/OATH, DOF). Records can lag the city's systems. Data refreshed weekly.