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
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
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.
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
- 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.
May 5, 2026
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.
Nov 19, 2025
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.
Jun 10, 2025
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
Jun 17, 2024
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
Jun 17, 2024
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.
Jun 17, 2024
Open — Nov sent out - 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
Jun 17, 2024
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
Jun 17, 2024
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, 1st story
Jun 17, 2024
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.
Apr 10, 2024
Open — Nov sent out
Show 25 more ↓
- 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 23, 2023
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.
Nov 10, 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.
Feb 25, 2022
Open — Nov sent out - CImmediately hazardous
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 - CImmediately hazardous
Provide ready access to buildings heating system door locked. at cellar
Dec 17, 2016
Open — Nov certified late - CImmediately hazardous
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 - 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 9, 2015
Closed — Violation dismissed - BHazardous
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 - 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 = 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 - BHazardous
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 - ANon-hazardous
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 - BHazardous
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 - BHazardous
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 - BHazardous
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 - CImmediately hazardous
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 - BHazardous
Replace with new the broken or defective broken glass at building entrance door , 1st story
Feb 15, 2013
Closed — Violation closed - BHazardous
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 - BHazardous
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 - 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 = 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 - BHazardous
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 - BHazardous
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 - BHazardous
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 - CImmediately hazardous
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 - CImmediately hazardous
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 - ANon-hazardous
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
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.