421 Throop Avenue

Brooklyn, NY 11221BBL 3-01806-0007Map

421 Throop Avenue is a mixed residential and retail building built in 1931 in Brooklyn, 11221. It has 3 residential units across 3 floors. The owner of record is 818 Prospect LLC. HPD has recorded 5 housing violations here, most recently on March 2, 2022. 1 of the 5 most recent violations are still open.

HPD violations: 5
DOB violations: 14
ECB violations: 5
HPD complaints: 1

What to know

Good

No open Class C

No open immediately-hazardous violations among recent records.

Good

Last violation Mar 2, 2022

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

No rent-stabilized units in 2018–2024 tax bills

Some apartments can still be regulated. Use the rent-stabilized checker or request the rent history from HCR.

Violations

Most recent first. Showing up to 50 per agency.

HPD housing violations · 5

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.
Mar 2, 2022
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 13, 2021
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 15, 2016
Closed — Violation dismissed
BHazardous
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. (light fixture present)
Nov 13, 2016
Open — Nov sent out
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.
Oct 14, 2015
Closed — Violation dismissed

DOB building violations · 14

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 for failure to file annual boiler 2013 inspection report
Mar 3, 2015
Dob violation - active
Boilers boiler required
Ll6291-local law 62/91 - boilers boiler required
Jan 19, 2007
Dob violation - dismissed
Boilers boiler required
Ll6291-local law 62/91 - boilers boiler required
Feb 27, 2001
Dob violation - dismissed
Boilers boiler required
Ll6291-local law 62/91 - boilers boiler required
Feb 27, 2001
Dob violation - dismissed
Boilers boiler required
Ll6291-local law 62/91 - boilers boiler required
Feb 7, 2000
Dob violation - dismissed
Boilers boiler required
Ll6291-local law 62/91 - boilers boiler required
Feb 7, 2000
Dob violation - dismissed
Boilers boiler required
Ll6291-local law 62/91 - boilers boiler required
Mar 16, 1999
Dob violation - dismissed
Boilers boiler required
Ll6291-local law 62/91 - boilers boiler required
Mar 16, 1999
Dob violation - dismissed
Boilers boiler required
Ll6291-local law 62/91 - boilers boiler required
May 4, 1998
Dob violation - dismissed

Show 4 more ↓

Boilers boiler required
Ll6291-local law 62/91 - boilers boiler required
Sep 16, 1997
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
Aug 29, 1995
Dob violation - dismissed
Boilers boiler required
Ll6291-local law 62/91 - boilers boiler required
Jul 25, 1994
Dob violation - dismissed

ECB violations · 5

Class - 2
Gas meter room has storage/gas meter room unventilated/ hwh safety discharge incorrect; correct violation and submit the certificate of correction
Mar 16, 2021 · Penalty $1,562
Resolve
Class - 2
3rd floor apt boiler=boiler safety valve not in the upright position/lwco missing/manual reset aquastat missing/remote switch missing, maintain boiler; correct violation and submit the certificate of correction
Mar 16, 2021 · Penalty $1,562
Resolve
Class - 2
2nd floor apt boiler=boiler safety valve leaking/backflow not piped down/expansion tank not supported/boiler flue not secured, maintain boiler; correct violation and submit the certificate of correction
Mar 16, 2021 · Penalty $1,562
Resolve
Class - 2
Failure to maintain bldg in code compliant manner: no fire stopping per bc 712.3; 27-345. noted: missing through ceiling around pipes making the rooms no fire proffing @ cellar level. rem: provide/maintain fire
Apr 27, 2017 · Penalty $250
Resolve
Class - 2
Exit door not self-closing noted: 3 exit door at first flr preschool not closing doors missing closers. rmdy: repair/replace doors.
Feb 27, 2015 · Penalty $2,500
Resolve

Complaints

Water leak
Heavy flow
Jul 27, 2018 · Apt 2R
Close

Sales history

No recorded sales in our data

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

Building details

Building type: Mixed residential and retail building (S3)
Year built: 1931
Floors: 3
Residential units: 3
Building area: 5,840 ft²
Lot area: 2,500 ft²
Zoning: R6B
Community board: 303
Council district: 36
Block / lot: 1806 / 7
Assessed value: $162,000
Landmark / historic district: No

HPD registration #362263, last renewed Oct 6, 2025.

Questions about 421 Throop Avenue

Who owns 421 Throop Avenue?

The owner of record in NYC Department of City Planning PLUTO data is 818 Prospect LLC.

Does 421 Throop Avenue have violations?

Yes. NYC HPD has recorded 5 housing violations at this property.

Is 421 Throop 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 421 Throop Avenue built?

City records list 1931 as the year it was built.

How many apartments are in 421 Throop Avenue?

It has 3 residential units and 4 units in total.

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