Brooklyn · Block 3326 · Lot 6 · 11221

531 Knickerbocker Avenue

4 floors · 23 apartments · 16,000 sq ft · built 1905 · class C1 · owner of record: Knickerbocker St Holdings Llc

2open violations
$216,250ECB/OATH penalties owed
0HPD class C (immediately hazardous)
Overdueto Annual property registration

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New violations the morning after they're issued, plus deadline reminders. Free for one building.

Compliance deadlines

RequirementDueStatus
Annual property registration Applies
HPD registration · September 1 each year
What this is

Residential buildings with three or more units, and one- and two-family homes the owner doesn't occupy, register with HPD every year ($13 fee). An unregistered building can't start a nonpayment case in Housing Court and faces civil penalties. Agency page

OverdueRegistration expired 2026-09-01
Gas piping inspection (2026 cycle) Likely applies
Local Law 152 · During 2026
What this is

Buildings with gas piping (except one- and two-family homes) need a periodic gas piping inspection by a licensed master plumber every four years. Community district 4 is on the 2026 cycle; certification is filed with DOB after the inspection. Buildings with no gas piping file a certification instead. Agency page

Dec 31, 2026
in 67 days
Due this year
Annual parapet observation Check
Local Law 126 · By December 31 each year
What this is

If the building has a parapet facing a street, sidewalk or other public way, a competent person (such as a mason, engineer or architect) must observe it every year and the owner keeps the report for DOB on request. Detached one- and two-family homes are exempt. Agency page

Dec 31, 2026
in 67 days
Keep the report on file (not filed with DOB)
Bedbug annual filing Applies
Local Law 69 · December 1 to 31 each year
What this is

Owners of multiple dwellings file their bedbug infestation history for the prior year with HPD and post or distribute it to tenants. Agency page

Dec 31, 2026
in 67 days
Annual
Annual notice: window guards and lead paint Applies
HPD / Health Code · January 1 to 16 each year
What this is

Deliver the annual notice to every unit asking whether a child lives there (window guards for children 10 and under; lead paint for children under 6 in pre-1960 buildings), then follow up on units that don't return it by mid-February. Agency page

Jan 16, 2027
in 83 days
Annual

Open violations

ECB / OATH (15) · $216,250 owed
IssuedViolationHearingBalance
Apr 28, 2026Construction CLASS - 2
WORK DOES NOT CONFORM TO APPROVED CONSTRUCTION DOCUMENTS AND/OR APPROVED AMENDMENTS. UPON INSPECTION AS REQUESTED BY RESPONDENT. NOTED: THE WORK WAS NOT CONFORMED AS PERMITTED BY JOB #B11278362-I1 AT APT #3F TH
#35727704N
Jan 12, 2027
$1,250
May 7, 2025Construction CLASS - 1
FAILURE TO OBEY A VACATE ORDER FROM THE COMMISSIONER AS PER 28-207.4.NOTED:AT TIME OF INSPECTION AT 3RD FL APT#3F HAS BEEN REOCCUPIED BY 2 INDIVIDUALS.THERE BY DISOBEYING ACTIVE ORDER#B170/25 ISSUED ON 04/04/20
#35690166Z
Mar 22, 2027
$10,000
May 7, 2025Construction CLASS - 1
REMOVED OR DEFACED A WRITTEN POSTED VACATE ORDER.NOTED AT THE TIME OF INSPECTION A WRITTEN POSTED VACATE ORDER.VAC#B170/25 ISSUED ON 04/04/2025 FOR APT 3F HAS BEEN REMOVED FROM ENTRY DOOR WHICH STILL ACTIVE.NEW
#35690165R
Mar 22, 2027
$5,000
May 7, 2025Construction CLASS - 2
FAILURE TO COMPLY WITH THE COMMISSIONER'S ORDER TO FILE A CERTIFICATE OF CORRECTION WITH THE DEPARTMENT OF BUILDINGS FOR VIOLATION CONDITIONS CITED IN NOV #35690240H ISSUED ON 04/04/2025. REMEDY: FILE A CERTIFI
#35690564Y
Apr 29, 2027
$1,250
May 7, 2025Construction CLASS - 2
FAILURE TO COMPLY WITH THE COMMISSIONER'S ORDER TO FILE A CERTIFICATE OF CORRECTION WITH THE DEPARTMENT OF BUILDINGS FOR VIOLATION CONDITIONS CITED IN NOV #35690238Z ISSUED ON 04/04/2025. REMEDY: FILE A CERTIFI
#35690562K
Apr 29, 2027
$1,250
May 7, 2025Construction CLASS - 2
FAILURE TO COMPLY WITH THE COMMISSIONER'S ORDER TO FILE A CERTIFICATE OF CORRECTION WITH THE DEPARTMENT OF BUILDINGS FOR VIOLATION CONDITIONS CITED IN NOV #35690236P ISSUED ON 04/04/2025. REMEDY: FILE A CERTIFI
#35690560R
Apr 29, 2027
$1,250
May 7, 2025Construction CLASS - 2
FAILURE TO COMPLY WITH THE COMMISSIONER'S ORDER TO FILE A CERTIFICATE OF CORRECTION WITH THE DEPARTMENT OF BUILDINGS FOR VIOLATION CONDITIONS CITED IN NOV #35690239K ISSUED ON 04/04/2025. REMEDY: FILE A CERTIFI
#35690563M
Apr 29, 2027
$1,250
May 7, 2025Construction CLASS - 1
BC 907.2.8 FAILURE TO PROVIDE CLASS J FIRE ALARM SYSTEM FOR TRANSIENT USE AT APT#3F ON 3RD FLOOR.PREVIOUS ECB VIOLATION#35690239K REM:DISCONTINUE ILLEGAL OCCUPANCY.
#35690168M
Mar 22, 2027
$6,250
May 7, 2025Construction CLASS - 2
FAILURE TO COMPLY WITH THE COMMISSIONER'S ORDER TO FILE A CERTIFICATE OF CORRECTION WITH THE DEPARTMENT OF BUILDINGS FOR VIOLATION CONDITIONS CITED IN NOV #35690237R ISSUED ON 04/04/2025. REMEDY: FILE A CERTIFI
#35690561Z
Apr 29, 2027
$1,250
May 7, 2025Quality of Life CLASS - 2
PERMANENT DWELLING USED/CONVERTED FOR OTHER THAN PERMANENT RESIDENTIALPURPOSES. THE DEPARTMENT OF BUILDING, RECORDS INDICATE PREMISES TO BE LEGALLY APPROVED AS CLASS "A" MULTIPLE DWELLING-NOW AT APARTMENT 3F AT
#35690559J
Feb 4, 2027
$2,500
Apr 4, 2025Construction CLASS - 1
WORK WITHOUT A PERMIT. WORK NOTED: AT 3RD FLOOR LEVEL APARTMENT 3F ERECTED FULL HEIGHT PARTITION WALLS TO CREATE AN ADDITIONAL BEDROOM WITH DOOR AND KEYLOCK DEVICE AT FRONT OF APARTMENT. REMEDY: OBTAIN PERMIT.
#35690240H
Feb 8, 2027
$2,500
Apr 4, 2025Quality of Life CLASS - 1
DWELLING CONVERTED, MAINTAINED OR OCCUPIED WITH 3 OR MORE ADDITIONAL DWELLING UNITS THAN LEGALLY AUTHORIZED BY DEPARTMENT OF BUILDINGS RECORDS: ILLEGAL OCCUPANCY NOTED: APARTMENT 3F AT 3RD FLOOR LEVEL HAS BEEN
#35690238Z
Feb 4, 2027
$60,000
Apr 4, 2025Construction CLASS - 1
BC 907.2.8. FAILURE TO MAINTAIN BUILDING IN A CODE-COMPLIANT MANNER. FAILURE TO PROVIDE A FIRE ALARM SYSTEM FOR SROS AT 3RD FLOOR LEVEL. REMEDY: DISCONTINUE ILLEGAL OCCUPANCY.
#35690239K
Feb 4, 2027
$2,500
Apr 4, 2025Quality of Life CLASS - 1
DWELLING CONVERTED, MAINTAINED OR OCCUPIED WITH 3 OR MORE ADDITIONAL DWELLING UNITS THAN LEGALLY AUTHORIZED BY DEPARTMENT OF BUILDINGS RECORDS: ILLEGAL OCCUPANCY NOTED: APARTMENT 3F AT 3RD FLOOR LEVEL HAS BEEN
#35690237R
Feb 4, 2027
$60,000
Apr 4, 2025Quality of Life CLASS - 1
DWELLING CONVERTED, MAINTAINED OR OCCUPIED WITH 3 OR MORE ADDITIONAL DWELLING UNITS THAN LEGALLY AUTHORIZED BY DEPARTMENT OF BUILDINGS RECORDS: ILLEGAL OCCUPANCY NOTED: APARTMENT 3F AT 3RD FLOOR LEVEL HAS BEEN
#35690236P
Feb 4, 2027
$60,000
DOB (1)
IssuedViolationStatus
Aug 16, 1993LOCAL LAW 62/91 - BOILERS

#19320
DOB VIOLATION - ACTIVE
DOB NOW Safety (1)
IssuedViolationStatus
Oct 31, 2025Gas Piping - LL152 FTF-PL-PER
Cycle 1, Sub-cycle C (premises is in Community District 4)
Active
HPD (0)

None open.

Check the agency records

Always confirm on the city's own systems before acting: DOB BIS property profile · DOB NOW · HPD Online · Pay ECB/OATH penalties (CityPay)

City records as of Oct 25, 2026, 1:56 PM ET. BBL 3033260006.

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