523 Knickerbocker Avenue
Brooklyn, NY 11221BBL 3-03326-0008Map
Owner of record: 523 Assets LLC
523 Knickerbocker Avenue is a walk-up apartment building built in 1905 in Brooklyn, 11221. It has 8 residential units across 4 floors. The owner of record is 523 Assets LLC. HPD has recorded 137 housing violations here, most recently on April 9, 2021. 2 of the 50 most recent violations are still open. City tax records listed 7 rent-stabilized apartments here in 2024.
- HPD violations
- 137
- DOB violations
- 7
- ECB violations
- 1
- HPD complaints
- 169
What to know
No open immediately-hazardous violations among recent records.
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 · 137
- 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 9, 2021
Closed — Violation dismissed - BHazardous
Repair the broken or defective plastered surfaces and paint in a uniform color the ceiling in the 2nd room from east located at apt 4l, 4th story, 1st apartment from west at north
Dec 7, 2018 · Apt 4L
Open — Not complied with - BHazardous
Provide a safe and adequate supply of electric service to the fixtures at ceiling in the 1st room from east located at apt 4l, 4th story, 1st apartment from west at north
Dec 7, 2018 · Apt 4L
Closed — Violation closed - BHazardous
Repair the broken or defective plastered surfaces and paint in a uniform color the ceiling in the 1st room from east located at apt 4l, 4th story, 1st apartment from west at north
Dec 7, 2018 · Apt 4L
Closed — Violation closed - BHazardous
Repair the roof so that it will not leak over ceiling in the 1st room from east located at apt 4l, 4th story, 1st apartment from west at north
Dec 7, 2018 · Apt 4L
Closed — Violation closed - BHazardous
Arrange and make self-closing the doors ... in the entrance located at apt 4l, 4th story, 1st apartment from west at north
Dec 7, 2018 · Apt 4L
Closed — Violation closed - ANon-hazardous
Paint with light colored paint to the satisfaction of this department ceilings, walls and soffits all stories at public hall
Oct 26, 2017
Closed — Violation dismissed - BHazardous
Arrange and make self-closing the doors at bulkhead to roof , 4th story
Oct 26, 2017
Closed — Violation dismissed - BHazardous
Remove all encumbrances consisting of wood cabinet at public hall, 4th story
Oct 26, 2017
Closed — Violation dismissed - BHazardous
M/d law abate the nuisance consisting of doors with key knobs obstructing egress to fire escape room in the 4th room from north located at apt 2r, 2nd story, 2nd apartment from west at north
Oct 20, 2017 · Apt 2R
Closed — Violation dismissed
Show 40 more ↓
- BHazardous
Replace with new the broken or defective glass upper window sash at south wall in the 5th room from north located at apt 2r, 2nd story, 2nd apartment from west at north
Oct 20, 2017 · Apt 2R
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
Aug 31, 2017
Open — Not complied with - BHazardous
M/d law abate the nuisance consisting of freestanding radiator at public hall, 4th story
Aug 31, 2017
Closed — Violation closed - BHazardous
Properly secure the loose decorative stone above 3rd story window, offset 3 at facade
Apr 18, 2017
Closed — Violation closed - CImmediately hazardous
Replace with new the missing brick above 3rd story window, offset 4 at facade
Apr 18, 2017
Closed — Violation closed - CImmediately hazardous
Replace with new the missing brick above all second story windows, offset 1, 2, 3, 4 at facade
Apr 18, 2017
Closed — Violation closed - CImmediately hazardous
Replace with new the missing brick above, first story window, offset 2 at facade
Apr 18, 2017
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; in the entire apartment located at apt 2r, 2nd story, 2nd apartment from north at east
Apr 6, 2017 · Apt 2R
Closed — Violation closed - BHazardous
Properly repair the broken or defective balances at lower sash window offset 2. in the 7th room from east located at apt 2r, 2nd story, 2nd apartment from north at east
Apr 6, 2017 · Apt 2R
Closed — Violation closed - BHazardous
Repair the broken or defective plastered surfaces and paint in a uniform color the ceiling in the kitchen located at apt 1l, 1st story, 1st apartment from north at east
Mar 28, 2017 · Apt 1L
Closed — Violation closed - ANon-hazardous
§ 300 m/d law file plans and application and legalize the following alteration or restore to the legal condition existing prior to the making of said alteration .... acoustic ceiling in the 7th room from east located at apt 1l, 1st story, 1st apartment from north at east
Mar 28, 2017 · Apt 1L
Closed — Violation closed - ANon-hazardous
§ 300 m/d law file plans and application and legalize the following alteration or restore to the legal condition existing prior to the making of said alteration .... acoustic ceiling in the 6th room from east located at apt 1l, 1st story, 1st apartment from north at east
Mar 28, 2017 · Apt 1L
Closed — Violation closed - BHazardous
Fire egress defective. remove obstructing bars or unlawful gates from at least 1 window or provide approved type gate ... in the kitchen located at apt 1l, 1st story, 1st apartment from north at east
Mar 28, 2017 · Apt 1L
Closed — Violation closed - BHazardous
Provide an adequate supply of gas to the fixtures at stove in the kitchen located at apt 1l, 1st story, 1st apartment from north at east
Mar 28, 2017 · Apt 1L
Closed — Violation closed - IInformation / order
The premises has been selected to participate in the alternative enforcement program which may result in building-wide inspections, fees, and extensive repair work to correct violations and underlying conditions. charges for repair work done pursuant to this order, if not paid, will become liens on the property
Jan 31, 2017
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
Jan 18, 2017
Closed — Violation closed - BHazardous
Repair or replace the smoke detector defective in the entire apartment located at apt 1r, 1st story, 1st apartment from west at north
Nov 23, 2016 · Apt 1R
Closed — Violation closed - BHazardous
Properly repair the source and abate the evidence of a water leak at ceiling in the bathroom located at apt 1r, 1st story, 1st apartment from west at north
Nov 23, 2016 · Apt 1R
Closed — Violation closed - BHazardous
Repair the broken or defective plastered surfaces and paint in a uniform color the ceiling in the bathroom located at apt 1r, 1st story, 1st apartment from west at north
Nov 23, 2016 · Apt 1R
Closed — Violation closed - BHazardous
Remove all obstructions and repair all defects in sink in the bathroom located at apt 1r, 1st story, 1st apartment from west at north
Nov 23, 2016 · Apt 1R
Closed — Violation closed - BHazardous
Replace with new the broken or defective ceramic wall tiles at north wall in the bathroom located at apt 1r, 1st story, 1st apartment from west at north
Nov 23, 2016 · Apt 1R
Closed — Violation closed - BHazardous
Properly repair with similar material the broken or defective wood floor in the private hallway located at apt 1r, 1st story, 1st apartment from west at north
Nov 23, 2016 · Apt 1R
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 = 1; wg to replace = 0; wg to repair = 0; in the entire apartment located at apt 1r, 1st story, 1st apartment from west at north
Nov 23, 2016 · Apt 1R
Closed — Violation closed - ANon-hazardous
Paint with light colored paint to the satisfaction of this department all peeling paint surfaces in the 5th room from north, the 1st room from north, the foyer , the bathroom located at apt 1r, 1st story, 1st apartment from west at north
Nov 23, 2016 · Apt 1R
Closed — Violation closed - BHazardous
Repair or replace the carbon monoxide detecting device(s). defective in the entire apartment located at apt 1r, 1st story, 1st apartment from west at north
Nov 23, 2016 · Apt 1R
Closed — Violation closed - ANon-hazardous
Paint with light colored paint to the satisfaction of this department all walls, ceilings and trims in the entire apartment located at apt 1r, 1st story, 1st apartment from west at north
Nov 23, 2016 · Apt 1R
Closed — Violation closed - BHazardous
Abate the nuisance consisting of mice in the entire apartment located at apt 1r, 1st story, 1st apartment from west at north
Nov 23, 2016 · Apt 1R
Closed — Violation closed - BHazardous
Abate the nuisance consisting of roaches in the entire apartment located at apt 1r, 1st story, 1st apartment from west at north
Nov 23, 2016 · Apt 1R
Closed — Violation closed - BHazardous
Properly repair the broken or defective intercom in the entrance located at apt 1l, 1st story, 1st apartment from north at east
Sep 22, 2016 · Apt 1L
Closed — Violation closed - BHazardous
Properly repair the broken or defective bell in the entrance located at apt 1l, 1st story, 1st apartment from north at east
Sep 22, 2016 · Apt 1L
Closed — Violation closed - BHazardous
Provide an adequate supply of gas to the fixtures at range in the kitchen located at apt 1l, 1st story, 1st apartment from north at east
Sep 22, 2016 · Apt 1L
Closed — Violation dismissed - BHazardous
Repair or replace the smoke detector defective located at apt 1l, 1st story, 1st apartment from north at east
Sep 22, 2016 · Apt 1L
Closed — Violation dismissed - BHazardous
Provide an approved and operational carbon monoxide detecting device, installed in accordance with applicable law and rules. located at apt 1l, 1st story, 1st apartment from north at east
Sep 22, 2016 · Apt 1L
Closed — Violation dismissed - BHazardous
Properly repair the broken or defective mortise lock on entrance door to building. at public hall, 1st story
Sep 21, 2016
Closed — Violation dismissed - BHazardous
And dept. rules and regulations. remove the encumbrance obstructing egress from fire escapes house hold items all stories balconies rear at fire escape
Sep 21, 2016
Closed — Violation dismissed - BHazardous
Remove all encumbrances consisting of paint containers, shovels, suit case and other materials at public hall stairs, 4th story
Sep 21, 2016
Closed — Violation dismissed - BHazardous
Abate the nuisance consisting of mice in the entire apartment located at apt 2r, 2nd story, 2nd apartment from north at east
Jul 16, 2016 · Apt 2R
Closed — Violation dismissed - BHazardous
Repair or replace the carbon monoxide detecting device(s). defective in the entire apartment located at apt 2r, 2nd story, 2nd apartment from north at east
Jul 16, 2016 · Apt 2R
Closed — Violation closed - BHazardous
Repair or replace the smoke detector defective in the entire apartment located at apt 2r, 2nd story, 2nd apartment from north at east
Jul 16, 2016 · Apt 2R
Closed — Violation closed - ANon-hazardous
Paint with light colored paint to the satisfaction of this department all peeling paint surfaces in the 3rd room from east, the 5th room from east, the foyer , the bathroom located at apt 2r, 2nd story, 2nd apartment from north at east
Jul 16, 2016 · Apt 2R
Closed — Violation closed
DOB building violations · 7
- 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 2010 inspection report
Dec 13, 2011
Dob violation - dismissed - Low pressure boiler boiler required
Lblvio-low pressure boiler boiler required
Dec 31, 2009
Dob violation - dismissed - Boilers boiler required
Ll6291-local law 62/91 - boilers boiler required
Feb 10, 1997
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 · 1
- Class - 1
Bc1001.3 failure to maintain egress clear and unobstructed. noted:at roof leve found access door sealed with glue and inoperable goose neckladder accessible to roof and adj roofs. rmdy: comply with nov.
Sep 12, 2016 · Penalty $1,630
Resolve
Complaints
- Heat/hot water
Entire building
Jan 16, 2025 · Apt 3L
Close - Heat/hot water
Entire building
Nov 17, 2024 · Apt 3L
Close - Safety
Fire escape
Apr 9, 2019 · Apt FE
Close - Safety
Carbon monoxide detector
Jan 23, 2019 · Apt 4L
Close - Electric
Lighting
Nov 27, 2018 · Apt 4L
Close - Door/window
Door
Nov 27, 2018 · Apt 4L
Close - Safety
Fire escape
Oct 25, 2017 · Apt 1L
Close - Safety
Fire escape
Oct 17, 2017 · Apt 2R
Close - Door/window
Window pane
Oct 17, 2017 · Apt 2R
Close - Safety
Fire escape
Oct 17, 2017 · Apt 2R
Close
Show 40 more ↓
- Paint/plaster
Wall
Aug 21, 2017 · Apt 4L
Close - Water leak
Slow leak
Aug 21, 2017 · Apt 4L
Close - Paint/plaster
Ceiling
Aug 21, 2017 · Apt 4L
Close - Appliance
Refrigerator
Aug 21, 2017 · Apt 4L
Close - Flooring/stairs
Floor
Aug 21, 2017 · Apt 4L
Close - Unsanitary condition
Pests
Aug 21, 2017 · Apt 4L
Close - Unsanitary condition
Pests
Aug 21, 2017 · Apt 4L
Close - Heat/hot water
Entire building
Dec 15, 2016 · Apt BLDG
Close - Paint/plaster
Ceiling
Dec 6, 2016 · Apt 2R
Close - Water leak
Heavy flow
Dec 6, 2016 · Apt 2R
Close - Plumbing
Bathtub/shower
Dec 6, 2016 · Apt 2R
Close - Paint/plaster
Wall
Dec 6, 2016 · Apt 2R
Close - Unsanitary condition
Mold
Dec 6, 2016 · Apt 2R
Close - Water leak
Slow leak
Nov 21, 2016 · Apt 1R
Close - Flooring/stairs
Floor
Nov 21, 2016 · Apt 1R
Close - Electric
Outlet/switch
Nov 21, 2016 · Apt 1R
Close - Paint/plaster
Ceiling
Nov 21, 2016 · Apt 1R
Close - Outside building
Roof door/hatch
Sep 19, 2016 · Apt 2R
Close - Electric
Lighting
Sep 19, 2016 · Apt 1R
Close - Water leak
Slow leak
Sep 19, 2016 · Apt 1R
Close - Plumbing
Bathtub/shower
Sep 19, 2016 · Apt 2R
Close - Appliance
Electric/gas range
Sep 19, 2016 · Apt 1L
Close - Paint/plaster
Wall
Sep 19, 2016 · Apt 1L
Close - Flooring/stairs
Floor
Sep 19, 2016 · Apt 1L
Close - General
Bell/buzzer/intercom
Sep 19, 2016 · Apt 1L
Close - General
Cabinet
Jul 28, 2016 · Apt 1R
Close - Unsanitary condition
Pests
Jul 28, 2016 · Apt 1R
Close - Paint/plaster
Wall
Jul 28, 2016 · Apt 1R
Close - Paint/plaster
Wall
Jul 14, 2016 · Apt 2R
Close - Paint/plaster
Wall
Jul 14, 2016 · Apt 2R
Close - Plumbing
Bathtub/shower
Jul 14, 2016 · Apt 2R
Close - Unsanitary condition
Pests
Jul 14, 2016 · Apt 2R
Close - Unsanitary condition
Pests
Jul 14, 2016 · Apt 2R
Close - Plumbing
Basin/sink
Jul 14, 2016 · Apt 2R
Close - Paint/plaster
Wall
Jul 14, 2016 · Apt 2R
Close - Paint/plaster
Window/frame
May 24, 2016 · Apt 2R
Close - Paint/plaster
Wall
May 24, 2016 · Apt 2R
Close - Water leak
Slow leak
May 18, 2016 · Apt 1R
Close - Flooring/stairs
Floor
May 18, 2016 · Apt 1R
Close - Unsanitary condition
Pests
May 18, 2016 · Apt 1R
Close
Sales history
No recorded sales in our data
Building details
- Building type
- Walk-up apartment building (C1)
- Year built
- 1905
- Floors
- 4
- Residential units
- 8
- Building area
- 9,000 ft²
- Lot area
- 3,000 ft²
- Zoning
- R6
- Community board
- 304
- Council district
- 37
- Block / lot
- 3326 / 8
- Assessed value
- $675,900
- Landmark / historic district
- No
HPD registration #352268, last renewed Sep 5, 2025.
Questions about 523 Knickerbocker Avenue
Who owns 523 Knickerbocker Avenue?
The owner of record in NYC Department of City Planning PLUTO data is 523 Assets LLC.
Does 523 Knickerbocker Avenue have violations?
Yes. NYC HPD has recorded 137 housing violations at this property.
Is 523 Knickerbocker Avenue rent stabilized?
NYC Department of Finance tax bills listed 7 rent-stabilized units here in 2024 (about 88% of its 8 apartments). To confirm a specific apartment, request its rent history from NYS Homes and Community Renewal.
When was 523 Knickerbocker Avenue built?
City records list 1905 as the year it was built.
How many apartments are in 523 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.