# 671 Knickerbocker Avenue, Brooklyn, NY 11221

BBL 3033780007 · Block 3378 · Lot 7 · BIN 3077321  
Canonical page: https://nycpropertyfacts.com/ny/brooklyn/671-knickerbocker-avenue-3033780007  
Last updated: 2026-11-01 · Open-item counts as of 2026-11-05

## Summary

671 Knickerbocker Avenue (Brooklyn, NY 11221; tax lot BBL 3033780007) 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 1910, on a 1,900 sq ft lot zoned R6. City tax records list the owner as CORNIELLE, DAYSI. The Department of Finance's final market value for tax year 2027 is $1,783,000. As of November 5, 2026, NYC Open Data shows eight active DOB violations and one open HPD violation. 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, “671 Knickerbocker Avenue, Brooklyn, NY 11221 (BBL 3033780007)”, data as of 2026-11-05, https://nycpropertyfacts.com/ny/brooklyn/671-knickerbocker-avenue-3033780007. Source: NYC Open Data.

## Open items

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

## Lot & building

- Owner of record: CORNIELLE, DAYSI
- Building class: S2 – Mixed-use: two-family home with one store or office
- Year built: 1910
- Floors: 3
- Units: 2 residential / 3 total
- Lot area: 1,900 sq ft · Building area: 4,800 sq ft
- Zoning: R6, C1-3
- Source: PLUTO (Dept. of City Planning) (https://data.cityofnewyork.us/d/64uk-42ks), data as of 2026-11-05

## Tax assessment

- Tax year 2027 (final roll): market value $1,783,000, assessed value $106,980, 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 |
|---|---|---|---|
| 2000-07-26 | recorded (DEED) | DEED dated 2000-07-26 from 671 KINCK REALTY CORP to CORNIELLE, DAYSI; CORNIELLE, RAIMON, no price stated ($0). | bnx9-e6tj |
| 1993-08-17 | recorded (DEED) | DEED dated 1993-08-17 from BROWN, VERA/EST OF to 671 KNICK REALTY CORP, no price stated ($0). | bnx9-e6tj |
| 1969-05-19 | recorded (DEED) | DEED dated 1969-05-19 from MUELLER LYDIA to HAFFNER HUGO C; BROWN VERA, 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).

No records found.

## 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 |
|---|---|---|---|
| 2023-06-30 | open (V-DOB VIOLATION - ACTIVE) | DOB violation (LBLVIO-LOW PRESSURE BOILER BOILER REQUIRED): VIOLATION ISSUED-FAILURE TO FILE 2020 EXTERNAL LOW PRESSURE INSPECTION. Active — not recorded as resolved or dismissed. | 3h2n-5cm9 |
| 2023-06-30 | open (V-DOB VIOLATION - ACTIVE) | DOB violation (LBLVIO-LOW PRESSURE BOILER BOILER REQUIRED): VIOLATION ISSUED-FAILURE TO FILE 2021 EXTERNAL LOW PRESSURE INSPECTION. Active — not recorded as resolved or dismissed. | 3h2n-5cm9 |
| 2023-06-20 | open (V-DOB VIOLATION - ACTIVE) | DOB violation (LBLVIO-LOW PRESSURE BOILER BOILER REQUIRED): VIOLATION ISSUED-FAILURE TO FILE 2018 EXTERNAL LOW PRESSURE INSPECTION. Active — not recorded as resolved or dismissed. | 3h2n-5cm9 |
| 2023-06-20 | open (V-DOB VIOLATION - ACTIVE) | DOB violation (LBLVIO-LOW PRESSURE BOILER BOILER REQUIRED): VIOLATION ISSUED-FAILURE TO FILE 2019 EXTERNAL LOW PRESSURE INSPECTION. Active — not recorded as resolved or dismissed. | 3h2n-5cm9 |
| 2023-04-25 | open (V-DOB VIOLATION - ACTIVE) | DOB violation (LBLVIO-LOW PRESSURE BOILER BOILER REQUIRED): VIOLATION ISSUED-FAILURE TO FILE 2022 EXTERNAL LOW PRESSURE INSPECTION. Active — not recorded as resolved or dismissed. | 3h2n-5cm9 |
| 2019-11-08 | open (V-DOB VIOLATION - ACTIVE) | DOB violation (LBLVIO-LOW PRESSURE BOILER BOILER REQUIRED): VIOLATION ISSUED FOR FAILURE TO FILE ANNUAL BOILER 2017 INSPECTION REPORT. Active — not recorded as resolved or dismissed. | 3h2n-5cm9 |
| 2018-04-06 | open (V-DOB VIOLATION - ACTIVE) | DOB violation (LBLVIO-LOW PRESSURE BOILER BOILER REQUIRED): VIOLATION ISSUED FOR FAILURE TO FILE ANNUAL BOILER 2016 INSPECTION REPORT. Active — not recorded as resolved or dismissed. | 3h2n-5cm9 |
| 2015-03-03 | open (V-DOB VIOLATION - ACTIVE) | DOB violation (LBLVIO-LOW PRESSURE BOILER BOILER REQUIRED): VIOLATION ISSUED FOR FAILURE TO FILE ANNUAL BOILER 2013 INSPECTION REPORT. Active — not recorded as resolved or dismissed. | 3h2n-5cm9 |
| 2009-09-03 | open (Nov Sent Out) | HPD class B violation (Class B) in apt 3: SECTION 27-2018 ADMIN. CODE: ABATE THE NUISANCE CONSISTING OF VERMIN MICE IN THE ENTIRE APARTMENT LOCATED AT APT 3, 3rd STORY. Open — not recorded as corrected. | wvxf-dwi5 |

## 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.

No records found.

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

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

| Date | Status | Description | Source |
|---|---|---|---|
| 2026-10-25 | closed (Closed) | 311 request to DSNY: Graffiti – Graffiti. | erm2-nwe9 |
| 2026-05-05 | closed (Closed) | 311 request to DEP: Noise – Noise: air condition/ventilation equipment (NV1). | 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 CORNIELLE, DAYSI. | 64uk-42ks |
| 2000-07-26 | recorded | Grantee (buyer) on the most recent deed (DEED, 2000-07-26). | 636b-3b5g |
| 2000-07-26 | recorded | Grantee (buyer) on the most recent deed (DEED, 2000-07-26). | 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/3033780007