Brooklyn · Block 3425 · Lot 7 · 11207

835 Knickerbocker Avenue

2 floors · 2 apartments · 1,826 sq ft · built 1931 · class B9 · owner of record: Guzman, Rafael

25open violations
$0ECB/OATH penalties owed
1HPD class C (immediately hazardous)
314dto Annual property registration

Get an email when anything changes here

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

Compliance deadlines

RequirementDueStatus
Annual property registration Check
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

Sep 1, 2027
in 314 days
Required only if the owner doesn't live there

Open violations

ECB / OATH (0)

None open.

DOB (0)

None open.

DOB NOW Safety (0)

None open.

HPD (25) · C 1 · B 22 · A 1
IssuedClassViolationCorrect by
Feb 20, 2026I§27-2107 ADM CODE OWNER FAILED TO FILE A VALID REGISTRATION STATEMENT WITH THE DEPARTMENT AS REQUIRED BY ADM CODE §27-2097 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 R—
Jul 15, 2026BApt 2 · § 27-2017.3 HMC: TRACE AND REPAIR THE SOURCE AND ABATE THE VISIBLE MOLD CONDITION... LESS THAN 10 SQUARE FEET AT WINDOW FRAME IN THE 1st ROOM FROM NORTH AT EAST LOCATED AT APT 2, 2nd STORY, 1st APARTMENT FROM NORTH AT EAST ORIGINAL VIOLATION 18703385 ISSUED 11-MAR-26 HAS BEEN UPGRADED TO CLASS B PERAug 19, 2026
Jul 14, 2026B§ 27-2017.3 HMC: TRACE AND REPAIR THE SOURCE AND ABATE THE VISIBLE MOLD CONDITION... GREATER THAN 30 SQUARE FEET AT NORTH WALL AT PUBLIC HALL, 2nd STORY ORIGINAL VIOLATION 18703371 ISSUED 11-MAR-26 HAS BEEN UPGRADED TO CLASS B PER ADMINISTRATIVE CODE 27-2017.3a(3)(a) or (b).Aug 18, 2026
Jun 22, 2026BApt 2 · § 27-2017.3 HMC: TRACE AND REPAIR THE SOURCE AND ABATE THE VISIBLE MOLD CONDITION... LESS THAN 10 SQ FT AT CEILING IN THE 1st ROOM FROM NORTH LOCATED AT APT 2, 2nd STORY, 1st APARTMENT FROM WEST AT NORTH ORIGINAL VIOLATION 18654643 ISSUED 18-FEB-26 HAS BEEN UPGRADED TO CLASS B PER ADMINISTRATIVE CODJul 27, 2026
Mar 17, 2026BApt 2 · § 27-2005 ADMIN. CODE: REPAIR THE BROKEN OR DEFECTIVE PLASTERED SURFACES AND PAINT IN UNIFORM COLOR AT CEILING AND ALL WALLS IN THE 3rd ROOM FROM EAST LOCATED AT APT 2, 2nd STORY, 1st APARTMENT FROM NORTH AT EASTApr 21, 2026
Mar 17, 2026BApt 2 · § 27-2005 HMC: PROPERLY REPAIR OR REPLACE THE BROKEN OR DEFECTIVE COUNTER BALANCE AT UPPER AND LOWER WINDOW SASHES IN THE 1st ROOM FROM NORTH AT EAST LOCATED AT APT 2, 2nd STORY, 1st APARTMENT FROM NORTH AT EASTApr 21, 2026
Mar 17, 2026BApt 2 · § 27-2005 HMC: PROPERLY REPAIR OR REPLACE THE BROKEN OR DEFECTIVE DOOR IN THE 3rd ROOM FROM EAST LOCATED AT APT 2, 2nd STORY, 1st APARTMENT FROM NORTH AT EASTApr 21, 2026
Mar 17, 2026BApt 2 · § 27-2005 ADMIN. CODE: PROPERLY REPAIR WITH SIMILAR MATERIAL THE BROKEN OR DEFECTIVE WOOD FLOOR IN THE 1st ROOM FROM NORTH AT EAST LOCATED AT APT 2, 2nd STORY, 1st APARTMENT FROM NORTH AT EASTApr 21, 2026
Mar 17, 2026BApt 2 · § 27-2005 HMC: PROPERLY REPAIR OR REPLACE THE BROKEN OR DEFECTIVE ELECTRICAL OUTLET AT NORTH WALL EAST WALL AND WEST WALL IN THE 3rd ROOM FROM EAST LOCATED AT APT 2, 2nd STORY, 1st APARTMENT FROM NORTH AT EASTApr 21, 2026
Mar 17, 2026BApt 2 · § 27-2005 ADMIN. CODE: REPAIR THE ROOF SO THAT IT WILL NOT LEAK OVER CEILING IN THE 3rd ROOM FROM EAST LOCATED AT APT 2, 2nd STORY, 1st APARTMENT FROM NORTH AT EASTApr 21, 2026
Mar 16, 2026BApt 2 · § 27-2005 ADMIN. CODE: REPAIR THE BROKEN OR DEFECTIVE PLASTERED SURFACES AND PAINT IN UNIFORM COLOR AT CEILING AND ALL WALLS IN THE BATHROOM LOCATED AT APT 2, 2nd STORY, 1st APARTMENT FROM NORTH AT EASTApr 20, 2026
Mar 16, 2026B§ 27-2005 ADMIN. CODE: REPAIR THE BROKEN OR DEFECTIVE PLASTERED SURFACES AND PAINT IN UNIFORM COLOR AT CEILING AND NORTH WALL AT PUBLIC HALL, 2nd STORYApr 20, 2026
Mar 16, 2026BApt 2 · § 27-2005 ADMIN. CODE: REPAIR THE ROOF SO THAT IT WILL NOT LEAK OVER CEILING IN THE KITCHEN LOCATED AT APT 2, 2nd STORY, 1st APARTMENT FROM NORTH AT EASTApr 20, 2026
Mar 16, 2026BApt 2 · § 27-2005 ADMIN. CODE: REPAIR THE BROKEN OR DEFECTIVE PLASTERED SURFACES AND PAINT IN UNIFORM COLOR THE CEILING AND ALL WALLS IN THE KITCHEN LOCATED AT APT 2, 2nd STORY, 1st APARTMENT FROM NORTH AT EASTApr 20, 2026
Mar 16, 2026BApt 2 · § 27-2005 ADMIN. CODE: PROPERLY REPAIR WITH SIMILAR MATERIAL THE BROKEN OR DEFECTIVE WOOD FLOOR IN THE KITCHEN LOCATED AT APT 2, 2nd STORY, 1st APARTMENT FROM NORTH AT EASTApr 20, 2026
Mar 16, 2026BApt 2 · § 27-2017.3 HMC: TRACE AND REPAIR THE SOURCE AND ABATE THE VISIBLE MOLD CONDITION... GREATER THAN 10 SQUARE FEET AT CEILING IN THE BATHROOM LOCATED AT APT 2, 2nd STORY, 1st APARTMENT FROM NORTH AT EASTApr 20, 2026
Mar 16, 2026BApt 2 · § 27-2005 ADMIN. CODE: REPAIR THE BROKEN OR DEFECTIVE PLASTERED SURFACES AND PAINT IN UNIFORM COLOR AT CEILING AND ALL WALLS IN THE 2nd ROOM FROM NORTH AT WEST LOCATED AT APT 2, 2nd STORY, 1st APARTMENT FROM NORTH AT EASTApr 20, 2026
Feb 20, 2026BApt 2 · HMC ADM CODE: § 27-2017.4 ABATE THE INFESTATION CONSISTING OF MICE IN THE ENTIRE APARTMENT LOCATED AT APT 2, 2nd STORY, 1st APARTMENT FROM WEST AT NORTHMar 27, 2026
Feb 20, 2026BApt 2 · § 27-2045(B)(1)(B) HMC, § 12-06, § 12-07, § 12-09 RCNY REPAIR, REPLACE OR PROVIDE AN APPROVED AND OPERATIONAL CARBON MONOXIDE DETECTING DEVICE, INSTALLED IN ACCORDANCE WITH APPLICABLE LAW AND RULES MISSING IN THE ENTIRE APARTMENT LOCATED AT APT 2, 2nd STORY, 1st APARTMENT FROM WEST AT NORTHMar 27, 2026
Feb 20, 2026BApt 2 · § 27-2005 ADMIN. CODE: REPAIR THE BROKEN OR DEFECTIVE PLASTERED SURFACES AND PAINT IN UNIFORM COLOR AT CEILING IN THE KITCHEN LOCATED AT APT 2, 2nd STORY, 1st APARTMENT FROM WEST AT NORTHMar 27, 2026
Feb 20, 2026BApt 2 · HMC ADM CODE: § 27-2017.4 ABATE THE INFESTATION CONSISTING OF ROACHES IN THE ENTIRE APARTMENT LOCATED AT APT 2, 2nd STORY, 1st APARTMENT FROM WEST AT NORTHMar 27, 2026
Feb 20, 2026CApt 2 · § 27-2005 HMC: PROPERLY REPAIR OR REPLACE THE BROKEN OR DEFECTIVE RADIATOR AIR VALVE LEAKING STEAM AT RISER IN THE 1st ROOM FROM NORTH LOCATED AT APT 2, 2nd STORY, 1st APARTMENT FROM WEST AT NORTHFeb 26, 2026
Jul 8, 2008BSECTION 27-2005 ADMIN. CODE: PROVIDE TEMPORARY SEALING OF ENTRANCE DOOR TO BUILDING AT FRONT AND REAR.Aug 12, 2008
Jul 8, 2008ASECTION 27-2005 ADMIN. CODE: REPLACE WITH NEW THE MISSING KNOBS OF FRONT ENTRANCE DOOR TO BUILDING.Oct 11, 2008
Jul 8, 2008BSECTION 27-2005 ADMIN. CODE: REPLACE WITH NEW THE BROKEN OR DEFECTIVE GLASS FRONT ENTRANCE DOOR TO BUILDING.Aug 12, 2008

Issued in the last 120 days

DateSourceWhatNow
Jul 15, 2026HPD B§ 27-2017.3 HMC: TRACE AND REPAIR THE SOURCE AND ABATE THE VISIBLE MOLD CONDITION... LESS THAN 10 SQUARE FEET AT WINDOW FRAME IN THE 1st ROOM FROM NORTH AT EAST LOCATED AT APT 2, 2nd STORY, 1st APARTMENT FROM NORTH AT EAST ORIGINAL VIOLATION 18703385 ISSUED 11-MAR-26 HAS BEEN UPGRADED TO CLASS B PEROpen
Jul 14, 2026HPD B§ 27-2017.3 HMC: TRACE AND REPAIR THE SOURCE AND ABATE THE VISIBLE MOLD CONDITION... GREATER THAN 30 SQUARE FEET AT NORTH WALL AT PUBLIC HALL, 2nd STORY ORIGINAL VIOLATION 18703371 ISSUED 11-MAR-26 HAS BEEN UPGRADED TO CLASS B PER ADMINISTRATIVE CODE 27-2017.3a(3)(a) or (b).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 22, 2026, 9:30 PM ET. BBL 3034250007.

Look up another building