# 423 Knickerbocker Avenue, Brooklyn, NY 11237

BBL 3032790003 · Block 3279 · Lot 3 · BIN 3074796  
Canonical page: https://nycpropertyfacts.com/ny/brooklyn/423-knickerbocker-avenue-3032790003  
Last updated: 2026-10-31 · Open-item counts as of 2026-10-31

Also recorded as: 425 Knickerbocker Ave; 423520 Knickerbocker Ave

## Summary

423 Knickerbocker Avenue (Brooklyn, NY 11237; tax lot BBL 3032790003) is a 2-unit mixed-use building with apartments and ground-floor commercial space (building class S2: mixed-use: two-family home with one store or office), built around 1931, on a 2,500 sq ft lot zoned C4-3. City tax records list the owner as 423 KNICKERBOCKER LLC; per ACRIS, a deed to this owner dated April 30, 2008 lists a price of $2,475,000. The Department of Finance's final market value for tax year 2027 is $2,163,000. As of October 31, 2026, NYC Open Data shows eight DOB jobs with a permit issued but no sign-off, five active DOB violations, one active ECB violation and 24 OATH tickets with an unpaid balance. There were two 311 requests in the past 12 months and no HPD complaints since 2019. (Source: NYC Open Data — DOB, HPD, OATH, DOF, DCP and ACRIS datasets — compiled by NYC Property Facts.)

How to cite: NYC Property Facts, “423 Knickerbocker Avenue, Brooklyn, NY 11237 (BBL 3032790003)”, data as of 2026-10-31, https://nycpropertyfacts.com/ny/brooklyn/423-knickerbocker-avenue-3032790003. Source: NYC Open Data.

## Open items

| Item | Count |
|---|---|
| Open DOB jobs (permit issued, not signed off) | 8 |
| Active DOB violations | 5 |
| Active ECB violations | 1 |
| Open HPD violations | 0 |
| OATH tickets with unpaid balance | 24 |

## Lot & building

- Owner of record: 423 KNICKERBOCKER LLC
- Building class: S2 – Mixed-use: two-family home with one store or office
- Year built: 1931
- Floors: 3
- Units: 2 residential / 3 total
- Lot area: 2,500 sq ft · Building area: 5,200 sq ft
- Zoning: C4-3
- Source: PLUTO (Dept. of City Planning) (https://data.cityofnewyork.us/d/64uk-42ks), data as of 2026-10-31

## Tax assessment

- Tax year 2027 (final roll): market value $2,163,000, assessed value $129,780, tax class 1
- Source: DOF Property Valuation and Assessment Data (https://data.cityofnewyork.us/d/8y4t-faws)

## Sales & deeds (ACRIS)

Deeds recorded with the City Register. amount 0 usually means a non-market transfer. lots_in_deed > 1 means the price covers several lots.

| Date | Status | Description | Source |
|---|---|---|---|
| 2008-04-30 | recorded (DEED) | DEED dated 2008-04-30 from FENSTER, DANIEL to 423 KNICKERBOCKER LLC, stated price $2,475,000. | bnx9-e6tj |
| 1985-01-08 | recorded (DEED) | DEED dated 1985-01-08 from ROSENBERG, JANET; LEVY, LAURENCE R; CATALINA, JANET to FENDAN PROPERTIES CO, no price stated ($0). | bnx9-e6tj |
| 1985-01-08 | recorded (DEED) | DEED dated 1985-01-08 from FENDAN PROPERTIES COINC to FENSTER, DANIEL, no price stated ($0). | bnx9-e6tj |
| 1968-06-05 | recorded (DEED) | DEED dated 1968-06-05 from ROSENBERG DAVID to ROSENBERG JANET, no price stated ($0). | bnx9-e6tj |
| 1968-04-19 | recorded (DEED) | DEED dated 1968-04-19 from STALLONE MARY; STALLONE PIETRO to LEVY LAURENCE R; ROSENBERG DAVID, no price stated ($0). | bnx9-e6tj |
| 1966-10-31 | recorded (DEED) | DEED dated 1966-10-31 from STALLONE PIETRO to STALLONE MARY; STALLONE PIETRO, no price stated ($0). | bnx9-e6tj |

## Open DOB jobs and recent work permits

A DOB "job" is an application to do construction work. status "open" = a permit was issued but DOB has no record of final sign-off. Work permits are listed with type "work_permit" and their DOB permit status (they are not counted as open items).

| Date | Status | Description | Source |
|---|---|---|---|
| 2023-07-20 | open (Permit Entire) | DOB NOW job filing B00904035-I1 (Alteration): Permit Entire — permit issued, no sign-off on record. | w9ak-ipjd |
| 2022-07-26 | open (Permit Entire) | DOB NOW job filing B00734604-I1 (Alteration): Permit Entire — permit issued, no sign-off on record. | w9ak-ipjd |
| 2021-07-02 | open (Permit Entire) | DOB NOW job filing B00544299-I1 (Alteration): Permit Entire — permit issued, no sign-off on record. | w9ak-ipjd |
| 2019-10-16 | open (PERMIT ISSUED - ENTIRE JOB/WORK) | BIS job 340701388 (A2 – Alteration with multiple work types (no change to use/occupancy)): PERMIT ISSUED - ENTIRE JOB/WORK — permit issued, no sign-off on record. HEREWITH FILING FOR INTERIOR RENOVATION OF 2ND FLOOR & 3RD FLOOR APARTMENTS AS PER PLANS. NO CHANGE TO USE, EGRESS OR OCCUPANCY. | ic3t-wcy2 |
| 2010-09-27 | open (PERMIT ISSUED - ENTIRE JOB/WORK) | BIS job 320220747 (A2 – Alteration with multiple work types (no change to use/occupancy)): PERMIT ISSUED - ENTIRE JOB/WORK — permit issued, no sign-off on record. REMOVE ERECTED WATER LINE AND ELETRICAL WIRES TO RESTORE PREMISES TO PREIOR LEGAL CONDITION, REMOVE VIOLATIONS 34841329N & 34841328L. NO CHANGE ACCUPANCY, USE, OOR MEANS OF EGRESS. | ic3t-wcy2 |
| 2009-05-05 | open (PERMIT ISSUED - ENTIRE JOB/WORK) | BIS job 320016941 (A3 – Minor alteration (one type of work)): PERMIT ISSUED - ENTIRE JOB/WORK — permit issued, no sign-off on record. INSTALLATION OF 25 LINEAR FT. TEMP. CONSTRUCTION PLYWOOD FENCE. NO CHANGE IN USE, EGRESS OR OCCUPANCY UNDER THIS APPLICATION. | ic3t-wcy2 |
| 2009-05-05 | open (PERMIT ISSUED - ENTIRE JOB/WORK) | BIS job 320016950 (A3 – Minor alteration (one type of work)): PERMIT ISSUED - ENTIRE JOB/WORK — permit issued, no sign-off on record. INSTALLATION OF MEDIUM DUTY PIPE SCAFFOLDING 25'X 40'HIGH. NO CHANGE IN USE, EGRESS OR OCCUPANCY. | ic3t-wcy2 |
| 2009-04-03 | open (PERMIT ISSUED - PARTIAL JOB) | BIS job 320003857 (A2 – Alteration with multiple work types (no change to use/occupancy)): PERMIT ISSUED - PARTIAL JOB — permit issued, no sign-off on record. REPLACE EXISTING STOREFRONT, INTERIOR RENOVATION, HVAC AS PER PLAN.INSTALL WOOD FENCE. NO CHANGE IN USE OCCUPANCY OR MEANS OF EGRESS | ic3t-wcy2 |
| 2024-11-15 | n/a (Signed-off) | DOB NOW work permit for job B00904035-I1: Boiler Equipment — HEREWITH FILING FOR ONE TANKLESS-BOILERS AS PER PLANS. Issued 2024-11-15, expires 2025-04-21. | rbx6-tga4 |
| 2024-09-16 | n/a (Signed-off) | DOB NOW work permit for job B00544299-I1: Plumbing — HEREWITH FILING FOR PLUMBING MODIFICATIONS AS PER PLANS. NO CHANGE OF USE, EGRESS OR OCCUPANCY THIS APPLICATION.. Issued 2024-09-16, expires 2025-04-21. | rbx6-tga4 |
| 2024-09-12 | n/a (Signed-off) | DOB NOW work permit for job B00734604-I1: Boiler Equipment — HEREWITH FILING FOR TWO TANKLESS-BOILERS AS PER PLANS. Issued 2024-09-12, expires 2025-04-21. | rbx6-tga4 |
| 2022-08-04 | n/a (Signed-off) | DOB NOW work permit for job B00734604-I1: Boiler Equipment — HEREWITH FILING FOR TWO TANKLESS-BOILERS AS PER PLANS. Issued 2022-08-04, expires 2023-05-01. | rbx6-tga4 |
| 2021-07-27 | n/a (Signed-off) | DOB NOW work permit for job B00544299-I1: Plumbing — HEREWITH FILING FOR PLUMBING MODIFICATIONS AS PER PLANS. NO CHANGE OF USE, EGRESS OR OCCUPANCY THIS APPLICATION.. Issued 2021-07-27, expires 2022-07-27. | rbx6-tga4 |
| 2021-07-21 | n/a (ISSUED (renewal)) | BIS work permit for job 340701388: Equipment work / Other / general construction. Issued 2021-07-21, expires 2022-06-03. | ipu4-2q9a |
| 2021-06-03 | n/a (ISSUED (renewal)) | BIS work permit for job 340701388: Equipment work / Other / general construction. Issued 2021-06-03, expires 2021-07-15. | ipu4-2q9a |
| 2019-10-30 | n/a (ISSUED (initial)) | BIS work permit for job 340701388: Equipment work / Other / general construction. Issued 2019-10-30, expires 2020-11-30. | ipu4-2q9a |
| 2010-10-05 | n/a (ISSUED (initial)) | BIS work permit for job 320220747: Plumbing / Plumbing. Issued 2010-10-05, expires 2011-10-05. | ipu4-2q9a |
| 2010-10-05 | n/a (ISSUED (initial)) | BIS work permit for job 320220747: Equipment work / Other / general construction. Issued 2010-10-05, expires 2011-01-12. | ipu4-2q9a |
| 2009-05-05 | n/a (ISSUED (initial)) | BIS work permit for job 320016950: Construction equipment (scaffold, fence, shed) / Construction equipment. Issued 2009-05-05, expires 2009-08-24. | ipu4-2q9a |
| 2009-05-05 | n/a (ISSUED (initial)) | BIS work permit for job 320016941: Construction equipment (scaffold, fence, shed) / Construction equipment. Issued 2009-05-05, expires 2009-08-24. | ipu4-2q9a |

Showing 20 of 24. Full list: https://nycpropertyfacts.com/api/v1/property/3032790003/permits

## Open violations (DOB, ECB, HPD)

status "open" = DOB violation category is ACTIVE, ECB violation status is ACTIVE, or HPD violation status is Open.

| Date | Status | Description | Source |
|---|---|---|---|
| 2009-12-31 | open (V-DOB VIOLATION - ACTIVE) | DOB violation (LBLVIO-LOW PRESSURE BOILER BOILER REQUIRED). Active — not recorded as resolved or dismissed. | 3h2n-5cm9 |
| 2009-01-01 | open (V-DOB VIOLATION - ACTIVE) | DOB violation (LL6291-LOCAL LAW 62/91 - BOILERS BOILER REQUIRED). Active — not recorded as resolved or dismissed. | 3h2n-5cm9 |
| 1994-06-01 | open (V-DOB VIOLATION - ACTIVE) | DOB violation (LL6291-LOCAL LAW 62/91 - BOILERS BOILER REQUIRED). Active — not recorded as resolved or dismissed. | 3h2n-5cm9 |
| 1993-08-16 | open (V-DOB VIOLATION - ACTIVE) | DOB violation (LL6291-LOCAL LAW 62/91 - BOILERS BOILER REQUIRED). Active — not recorded as resolved or dismissed. | 3h2n-5cm9 |
| 1993-06-01 | open (V-DOB VIOLATION - ACTIVE) | DOB violation (LL6291-LOCAL LAW 62/91 - BOILERS BOILER REQUIRED). Active — not recorded as resolved or dismissed. | 3h2n-5cm9 |
| 2022-08-16 | open (DEFAULT · NO COMPLIANCE RECORDED) | ECB (DOB) violation, class - 2: BOILER DETAILS INCORRECT ON PLANS AS PER FGC-106.7. FLUE TERMINATION INCORRECT AND MISSING LOCKING CLIPS ON VENTING EXHAUST AS PER MANUFACTURES INSTRUCTIONS FGC-502.5. MANUAL RESET LOW WATER CUT OFF MISSING AS. Active. Balance due $6,250. | 6bgk-3dad |

## OATH tickets with unpaid balance or pending

status "open" = balance due > $0 after a decision (cases awaiting a hearing are "pending"). default=true means the respondent did not appear.

| Date | Status | Description | Source |
|---|---|---|---|
| 2026-05-21 | open (DEFAULTED · DEFAULTED) | OATH ticket from Dos - Enforcement Agents: LOOSE RUBBISH 1ST OCCURRENCE. Unpaid balance $300. Respondent defaulted (did not appear). | jz4z-kudi |
| 2026-05-20 | open (DEFAULTED · DEFAULTED) | OATH ticket from Sanitation Others: STORAGE OF RECEPTACLES NON-COLLECTION DAY. Unpaid balance $300. Respondent defaulted (did not appear). | jz4z-kudi |
| 2026-05-19 | open (DEFAULTED · DEFAULTED) | OATH ticket from Dos - Enforcement Agents: IMPROPER RECEPTACLE FAILURE TO CONTAINERIZE - RESIDENTIAL 1ST. Unpaid balance $300. Respondent defaulted (did not appear). | jz4z-kudi |
| 2025-08-09 | open (DOCKETED · DEFAULTED) | OATH ticket from Sanitation Others: IMPROPER DISPOSAL--BEDDING 1ST OCCURRENCE. Unpaid balance $300. Respondent defaulted (did not appear). | jz4z-kudi |
| 2025-05-17 | open (DOCKETED · DEFAULTED) | OATH ticket from Dos - Enforcement Agents: DIRTY SIDEWALK COMM MAN INDUSTRIAL MIXED USE 1ST. Unpaid balance $450. Respondent defaulted (did not appear). | jz4z-kudi |
| 2025-03-03 | open (DOCKETED · DEFAULTED) | OATH ticket from Sanitation Others: DIRTY SIDEWALK. Unpaid balance $300. Respondent defaulted (did not appear). | jz4z-kudi |
| 2024-10-26 | open (DOCKETED · DEFAULTED) | OATH ticket from Sanitation Others: DIRTY SIDEWALK. Unpaid balance $300. Respondent defaulted (did not appear). | jz4z-kudi |
| 2024-10-21 | open (DOCKETED · DEFAULTED) | OATH ticket from Sanitation Others: IMPROPER DISPOSAL--BEDDING 1ST OCCURRENCE. Unpaid balance $300. Respondent defaulted (did not appear). | jz4z-kudi |
| 2024-09-18 | open (DOCKETED · DEFAULTED) | OATH ticket from Sanitation Others: STORAGE OF RECEPTACLES PLACED OUT PRIOR TO 8PM WITHOUT A RECEPTACLE. Unpaid balance $300. Respondent defaulted (did not appear). | jz4z-kudi |
| 2024-04-08 | open (DOCKETED · DEFAULTED) | OATH ticket from Sanitation Others: DIRTY SIDEWALK. Unpaid balance $300. Respondent defaulted (did not appear). | jz4z-kudi |
| 2024-04-05 | open (DOCKETED · DEFAULTED) | OATH ticket from Sanitation Others: IMPROPER RECEPTACLES 1ST OCCURRENCE. Unpaid balance $300. Respondent defaulted (did not appear). | jz4z-kudi |
| 2023-11-13 | open (DOCKETED · DEFAULTED) | OATH ticket from Dos - Enforcement Agents: LOOSE RUBBISH 1ST OCCURRENCE. Unpaid balance $300. Respondent defaulted (did not appear). | jz4z-kudi |
| 2023-10-25 | open (DOCKETED · DEFAULTED) | OATH ticket from Dos - Enforcement Agents: STORAGE OF RECEPTACLES PLACED OUT PRIOR TO 8PM WITHOUT A RECEPTACLE. Unpaid balance $300. Respondent defaulted (did not appear). | jz4z-kudi |
| 2023-08-09 | open (DOCKETED · DEFAULTED) | OATH ticket from Dos - Enforcement Agents: STORAGE OF RECEPTACLES PLACED OUT PRIOR TO 8PM WITHOUT A RECEPTACLE. Unpaid balance $300. Respondent defaulted (did not appear). | jz4z-kudi |
| 2023-06-24 | open (DOCKETED · DEFAULTED) | OATH ticket from Dos - Enforcement Agents: DIRTY SIDEWALK. Unpaid balance $300. Respondent defaulted (did not appear). | jz4z-kudi |
| 2023-02-15 | open (DOCKETED · DEFAULTED) | OATH ticket from Dos - Enforcement Agents: FAILURE TO PROPERLY PUT RECYCS OUT FOR COLLECTION 1TO8DWELLING UNITS. Unpaid balance $25. Respondent defaulted (did not appear). | jz4z-kudi |
| 2022-08-16 | open (DOCKETED · DEFAULTED) | OATH ticket from Dept. Of Buildings: MISCELLANEOUS VIOLATIONS. Unpaid balance $6,250. Respondent defaulted (did not appear). | jz4z-kudi |
| 2022-07-12 | open (DOCKETED · DEFAULTED) | OATH ticket from Sanitation Others: LOOSE RUBBISH 1ST OCCURRENCE. Unpaid balance $300. Respondent defaulted (did not appear). | jz4z-kudi |
| 2021-12-08 | open (DOCKETED · DEFAULTED) | OATH ticket from Dos - Enforcement Agents: FAILURE TO PROPERLY PUT RECYCS OUT FOR COLLECTION 1TO8DWELLING UNITS. Unpaid balance $25. Respondent defaulted (did not appear). | jz4z-kudi |
| 2020-10-21 | open (DOCKETED · DEFAULTED) | OATH ticket from Sanitation Others: DIRTY AREA. Unpaid balance $300. Respondent defaulted (did not appear). | jz4z-kudi |

Showing 20 of 24. Full list: https://nycpropertyfacts.com/api/v1/property/3032790003/hearings

## Complaints (HPD since 2019, 311 last 12 months)

Complaints are reports, not violations. status mirrors the published complaint / request status.

| Date | Status | Description | Source |
|---|---|---|---|
| 2026-09-11 | closed (Closed) | 311 request to DEP: Noise – Air Conditioner/Ventilation. | erm2-nwe9 |
| 2026-08-31 | closed (Closed) | 311 request to DSNY: Dirty Condition – Trash. | erm2-nwe9 |

## Owners & contacts

Owner of record comes from city tax records (PLUTO) and can lag behind recent sales.

| Date | Status | Description | Source |
|---|---|---|---|
| 2026-08-24 | current | City tax records (PLUTO) list the owner as 423 KNICKERBOCKER LLC. | 64uk-42ks |
| 2008-04-30 | recorded | Grantee (buyer) on the most recent deed (DEED, 2008-04-30). | 636b-3b5g |

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Independent site. Data from NYC Open Data; not affiliated with the City of New York. Not a title search or official record; verify with the issuing agency. JSON: https://nycpropertyfacts.com/api/v1/property/3032790003