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723 Knickerbocker Avenue

Brooklyn, NY 11221BBL 3-03392-0005Map

Owner of record: Ramirez, Emperatriz

723 Knickerbocker Avenue is a walk-up apartment building built in 1910 in Brooklyn, 11221. It has 8 residential units across 4 floors. The owner of record is Ramirez, Emperatriz. HPD has recorded 35 housing violations here, most recently on May 5, 2026. 24 of the 35 most recent violations are still open. City tax records listed 8 rent-stabilized apartments here in 2024.

HPD violations
35
DOB violations
7
ECB violations
1
HPD complaints
112

What to know

Concern
5 open Class C

Immediately hazardous issues among recent violations are still open.

Good
Last violation May 5, 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
8
About 100% of the building's 8 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 · 35

  • 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 5, 2026

    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.

    Nov 19, 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.

    Jun 10, 2025

    Open — Nov sent out
  • A

    § 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

    Jun 17, 2024

    Open — Nov sent out
  • A

    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

    Jun 17, 2024

    Open — Nov sent out
  • A

    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.

    Jun 17, 2024

    Open — Nov sent out
  • A

    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

    Jun 17, 2024

    Open — Nov sent out
  • A

    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

    Jun 17, 2024

    Open — Nov sent out
  • A

    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, 1st story

    Jun 17, 2024

    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.

    Apr 10, 2024

    Open — Nov sent out
Show 25 more ↓
  • 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 23, 2023

    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.

    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.

    Feb 25, 2022

    Open — Nov sent out
  • C

    Provide an adequate supply of heat for the apartment in the entire apartment located at apt 2r, 2nd story, 2nd apartment from west at north

    Dec 17, 2016 · Apt 2R

    Closed — Violation dismissed
  • C

    Provide ready access to buildings heating system door locked. at cellar

    Dec 17, 2016

    Open — Nov certified late
  • C

    M/d law abate the nuisance consisting of hot water exceeds the maximum if 130 degrees, found hot water to be 194 degrees at fixtures in the entire apartment located at apt 2r, 2nd story, 2nd apartment from west at north

    Dec 17, 2016 · Apt 2R

    Closed — Violation closed
  • 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 9, 2015

    Closed — Violation dismissed
  • B

    Fire egress defective. remove obstructing bars or unlawful gates from window to fire escape or provide approved type gate ,, located at apt 3r, 3rd story, 2nd apartment from north at east

    Aug 23, 2014 · Apt 3R

    Open — Nov certified late
  • C

    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 = 2; wg to replace = 0; wg to repair = 0; located at apt 3r, 3rd story, 2nd apartment from north at east

    Aug 23, 2014 · Apt 3R

    Open — Nov certified late
  • B

    Repair or replace the carbon monoxide detecting device(s). inoperable located at apt 3r, 3rd story, 2nd apartment from north at east

    Aug 23, 2014 · Apt 3R

    Open — Nov certified late
  • A

    Paint with light colored paint to the satisfaction of this department all peeling paint surfaces in the 4th room from east, the 1st room from east located at apt 3r, 3rd story, 2nd apartment from north at east

    Aug 23, 2014 · Apt 3R

    Closed — Violation dismissed
  • B

    Repair or replace the smoke detector inoperable located at apt 3r, 3rd story, 2nd apartment from north at east

    Aug 23, 2014 · Apt 3R

    Open — Nov certified late
  • B

    Properly repair the broken or defective counter balance at window lower sash in the 1st room from north located at apt 3r, 3rd story, 1st apartment from east at south

    Mar 29, 2013 · Apt 3R

    Open — Certification postponment granted
  • B

    Properly repair the broken or defective counter balance at upper sash window in the 1st room from north located at apt 3r, 3rd story, 1st apartment from east at south

    Mar 29, 2013 · Apt 3R

    Open — Certification postponment granted
  • C

    Correct the lead-based paint hazard - presumed lead paint that is peeling or on a deteriorated subsurface using work practices set forth in 28 rcny ?11-06(b)(2) 1st radiator from south at west wall in the 3rd room from north located at apt 3r, 3rd story, 1st apartment from east at south

    Mar 29, 2013 · Apt 3R

    Open — Certification postponment granted
  • B

    Replace with new the broken or defective broken glass at building entrance door , 1st story

    Feb 15, 2013

    Closed — Violation closed
  • B

    M/d law abate the nuisance consisting of key-operated lock installed at door to room of fire escape window obstructing egress located at apt 3r, 3rd story, 1st apartment from north at east

    Feb 15, 2013 · Apt 3R

    Closed — Violation closed
  • B

    Repair or replace the smoke detector inoperable located at apt 3r, 3rd story, 1st apartment from north at east

    Feb 15, 2013 · Apt 3R

    Closed — Violation closed
  • C

    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 = 2; wg to replace = 0; wg to repair = 0; located at apt 3r, 3rd story, 1st apartment from north at east

    Feb 15, 2013 · Apt 3R

    Closed — Violation closed
  • B

    Abate the nuisance consisting of mice located at apt 3r, 3rd story, 1st apartment from north at east

    Feb 15, 2013 · Apt 3R

    Open — Not complied with
  • B

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

    Feb 15, 2013 · Apt 3R

    Closed — Violation closed
  • B

    Abate the nuisance consisting of bedbugs located at apt 3r, 3rd story, 2nd apartment from north at east

    Jan 18, 2013 · Apt 3R

    Open — Not complied with
  • C

    Correct the lead-based paint hazard - paint that tested positive for lead content and that is peeling or on a deteriorated subsurface - using work practices set forth in 28 rcny ?11-06(b)(2) 1st door frame from north at east wall in the 7th room from east located at apt 4r, 4th story, 1st apartment from north at east

    Nov 20, 2008 · Apt 4R

    Open — Nov sent out
  • C

    Correct the lead-based paint hazard - paint that tested positive for lead content and that is peeling or on a deteriorated subsurface - using work practices set forth in 28 rcny ?11-06(b)(2) 1st door from south at west wall in the 1st room from east located at apt 4r, 4th story, 1st apartment from north at east

    Nov 20, 2008 · Apt 4R

    Open — Nov sent out
  • A

    D26-10.01 adm code paint metal in accordance with dept. regulation cornice roof front of bldg.

    Jul 16, 1985

    Open — Nov sent out

DOB building violations · 7

  • 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

    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

    Jun 1, 1994

    Dob violation - active
  • 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 - active

ECB violations · 1

  • Class - 2

    Residence altered for occupancy for more than the legally approved number of families. dob records indicate premises to be legally approved for an 8 family dwelling. now premises converted to be an 8 family & 1

    Jan 14, 2009 · Penalty $1,200

    Active

Complaints

  • Paint/plaster

    Ceiling

    Feb 6, 2025 · Apt 2R

    Close
  • Unsanitary condition

    Mold

    Jun 11, 2024 · Apt 3R

    Close
  • Water leak

    Slow leak

    Jun 11, 2024 · Apt 3R

    Close
  • Electric

    Outlet/switch

    Jun 11, 2024 · Apt 3R

    Close
  • Heat/hot water

    Entire building

    Nov 9, 2017 · Apt 1R

    Close
  • Heat/hot water

    Entire building

    Dec 16, 2016 · Apt 2R

    Close
  • Heat/hot water

    Entire building

    Nov 22, 2016 · Apt 1L

    Close
  • Heat/hot water

    Entire building

    Sep 13, 2016 · Apt 1L

    Close
  • Heat/hot water

    Entire building

    Feb 24, 2016 · Apt 3R

    Close
  • Heat/hot water

    Entire building

    Jan 22, 2016 · Apt 1L

    Close
Show 40 more ↓
  • Heat/hot water

    Entire building

    Jan 19, 2016 · Apt 1L

    Close
  • Heat/hot water

    Entire building

    Jan 3, 2016 · Apt 4L

    Close
  • Heat/hot water

    Entire building

    Nov 24, 2015 · Apt 2R

    Close
  • Heat/hot water

    Entire building

    Jan 8, 2015 · Apt 2L

    Close
  • Unsanitary condition

    Mold

    Aug 20, 2014 · Apt 3R

    Close
  • Paint/plaster

    Ceiling

    Aug 20, 2014 · Apt 3R

    Close
  • Heating

    Heat related

    Feb 5, 2014 · Apt 2R

    Close
  • Heating

    Heat related

    Nov 30, 2013 · Apt 2R

    Close
  • Nonconst

    Vermin

    Feb 4, 2013 · Apt 3R

    Close
  • Nonconst

    Vermin

    Feb 4, 2013 · Apt 3R

    Close
  • Nonconst

    Vermin

    Jan 16, 2013 · Apt 3R

    Close
  • Nonconst

    Vermin

    Jan 16, 2013 · Apt 3R

    Close
  • Heating

    Heat related

    Nov 26, 2012 · Apt 1L

    Close
  • Heating

    Heat related

    Jan 3, 2012 · Apt 2R

    Close
  • General

    Doors

    Aug 25, 2010 · Apt 4R

    Close
  • Plumbing

    Bathtub/shower

    Aug 25, 2010 · Apt 4R

    Close
  • General

    Windows

    Aug 25, 2010 · Apt 4R

    Close
  • General

    Windows

    Aug 25, 2010 · Apt 4R

    Close
  • Nonconst

    Vermin

    Aug 25, 2010 · Apt 4R

    Close
  • Plumbing

    Basin/sink

    Aug 25, 2010 · Apt 4R

    Close
  • General

    Doors

    Aug 25, 2010 · Apt 4R

    Close
  • General

    Windows

    Aug 25, 2010 · Apt 4R

    Close
  • Nonconst

    Vermin

    Aug 25, 2010 · Apt 4R

    Close
  • General

    Floor

    Aug 25, 2010 · Apt 4R

    Close
  • Nonconst

    Vermin

    Jul 6, 2010 · Apt 4L

    Close
  • Paint/plaster

    Wall

    Jul 6, 2010 · Apt 4L

    Close
  • Appliance

    Electric/gas range

    Jul 6, 2010 · Apt 4L

    Close
  • Nonconst

    Smoke detector

    Jul 6, 2010 · Apt 4L

    Close
  • Nonconst

    Carbon monoxide

    Jul 6, 2010 · Apt 4L

    Close
  • General

    Mailbox

    Jul 6, 2010 · Apt 4L

    Close
  • Electric

    Wiring

    Jul 6, 2010 · Apt 4L

    Close
  • Plumbing

    Basin/sink

    Oct 6, 2009 · Apt 3R

    Close
  • General

    Windows

    May 5, 2009 · Apt 4R

    Close
  • Electric

    Wiring

    May 5, 2009 · Apt 4R

    Close
  • Plumbing

    Water-leaks

    May 5, 2009 · Apt 4R

    Close
  • General

    Windows

    May 5, 2009 · Apt 4R

    Close
  • Heating

    Heat related

    Apr 8, 2009 · Apt 4R

    Close
  • Heating

    Heat related

    Mar 3, 2009 · Apt 4L

    Close
  • Heating

    Heat related

    Mar 3, 2009 · Apt 4L

    Close
  • Nonconst

    Carbon monoxide

    Feb 17, 2009 · Apt 4R

    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 (C1)
Year built
1910
Floors
4
Residential units
8
Building area
7,956 ft²
Lot area
2,550 ft²
Zoning
R6
Community board
304
Council district
37
Block / lot
3392 / 5
Assessed value
$597,600
Landmark / historic district
No

HPD registration #318146, last renewed Jun 29, 2026.

Questions about 723 Knickerbocker Avenue

Who owns 723 Knickerbocker Avenue?

The owner of record in NYC Department of City Planning PLUTO data is Ramirez, Emperatriz.

Does 723 Knickerbocker Avenue have violations?

Yes. NYC HPD has recorded 35 housing violations at this property.

Is 723 Knickerbocker Avenue rent stabilized?

NYC Department of Finance tax bills listed 8 rent-stabilized units here in 2024 (about 100% of its 8 apartments). To confirm a specific apartment, request its rent history from NYS Homes and Community Renewal.

When was 723 Knickerbocker Avenue built?

City records list 1910 as the year it was built.

How many apartments are in 723 Knickerbocker Avenue?

It has 8 residential units.

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