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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

Good
No open Class C

No open immediately-hazardous violations among recent records.

Good
Last violation Apr 9, 2021

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 88% 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 · 137

  • 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 9, 2021

    Closed — Violation dismissed
  • B

    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
  • B

    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
  • B

    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
  • B

    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
  • B

    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
  • A

    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
  • B

    Arrange and make self-closing the doors at bulkhead to roof , 4th story

    Oct 26, 2017

    Closed — Violation dismissed
  • B

    Remove all encumbrances consisting of wood cabinet at public hall, 4th story

    Oct 26, 2017

    Closed — Violation dismissed
  • B

    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 ↓
  • B

    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
  • 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

    Aug 31, 2017

    Open — Not complied with
  • B

    M/d law abate the nuisance consisting of freestanding radiator at public hall, 4th story

    Aug 31, 2017

    Closed — Violation closed
  • B

    Properly secure the loose decorative stone above 3rd story window, offset 3 at facade

    Apr 18, 2017

    Closed — Violation closed
  • C

    Replace with new the missing brick above 3rd story window, offset 4 at facade

    Apr 18, 2017

    Closed — Violation closed
  • C

    Replace with new the missing brick above all second story windows, offset 1, 2, 3, 4 at facade

    Apr 18, 2017

    Closed — Violation closed
  • C

    Replace with new the missing brick above, first story window, offset 2 at facade

    Apr 18, 2017

    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; in the entire apartment located at apt 2r, 2nd story, 2nd apartment from north at east

    Apr 6, 2017 · Apt 2R

    Closed — Violation closed
  • B

    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
  • B

    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
  • A

    § 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
  • A

    § 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
  • B

    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
  • B

    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
  • I

    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
  • 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

    Jan 18, 2017

    Closed — Violation closed
  • B

    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
  • B

    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
  • B

    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
  • B

    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
  • B

    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
  • B

    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
  • 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 = 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
  • A

    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
  • B

    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
  • A

    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
  • B

    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
  • B

    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
  • B

    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
  • B

    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
  • B

    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
  • B

    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
  • B

    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
  • B

    Properly repair the broken or defective mortise lock on entrance door to building. at public hall, 1st story

    Sep 21, 2016

    Closed — Violation dismissed
  • B

    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
  • B

    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
  • B

    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
  • B

    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
  • B

    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
  • A

    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

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

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.