671 Knickerbocker Avenue, Brooklyn, NY 11221
BBL 3033780007 (Borough 3, Block 3378, Lot 7) · BIN 3077321 · Last updated:
Summary · as of October 31, 2026
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 October 31, 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.)
- Owner of record
- CORNIELLE, DAYSI
- Building class
- S2 · Mixed-use: two-family home with one store or office
- Year built · units
- 1910 · 2 res.
- Lot area · zoning
- 1,900 sq ft · R6
- Market value (DOF)
- $1,783,000 FY2027
- Last priced deed
- —
- BBL
- 3033780007
- BIN
- 3077321
- 0Open DOB jobs (permit issued, no sign-off)
- 8Active DOB violations
- 0Active ECB violations
- 1Open HPD violations
- 0OATH tickets with unpaid balance
How to cite: NYC Property Facts, “671 Knickerbocker Avenue, Brooklyn, NY 11221 (BBL 3033780007)”, data as of 2026-10-31, https://nycpropertyfacts.com/ny/brooklyn/671-knickerbocker-avenue-3033780007. Source: NYC Open Data.
Lot & building
Basic facts about the tax lot and building from the city’s PLUTO database.
- Owner (as listed by the city)
- CORNIELLE, DAYSIThe owner name on the city’s tax records. It can lag behind recent sales and is often an LLC.
- Building class
- S2 – Mixed-use: two-family home with one store or officeThe Department of Finance’s category for what kind of building this is.
- Land use
- Mixed residential & commercialCity Planning’s broad category of how the lot is used.
- Year built
- 1910Often an estimate for older buildings.
- Floors
- 3
- Units
- 2 residential / 3 totalResidential units are apartments; total includes stores and offices.
- Buildings on lot
- 1
- Lot size
- 1,900 sq ft (20 ft × 95 ft)
- Building floor area
- 4,800 sq ft (incl. 2,400 sq ft commercial)
- Zoning
- R6, C1-3The zoning district sets what can be built and used here. Residential district; the overlay (C1/C2…) allows local retail on residential blocks.
- Built vs. allowed density (FAR)
- 2.53 built / 2.43 max residentialFloor Area Ratio = building floor area ÷ lot area. If built FAR is below the maximum, zoning may allow more floor area (other rules apply).
- Identifiers
- BBL 3033780007 (Borough 3, Block 3378, Lot 7) · BIN 3077321BBL identifies the tax lot; BIN identifies each building (from DOB/HPD/footprint records).
Agency lookups: DOB BIS · ZoLa (zoning map) · ACRIS
Source: PLUTO (Dept. of City Planning) — city dataset updated 2026-08-24; data as of 2026-10-31; Building Footprints — city dataset updated 2026-10-25; data as of 2026-10-31
Tax assessment
How the Department of Finance values this lot for property tax.
- Market value (tax year 2027, final roll)
- $1,783,000The Department of Finance’s estimate of value for tax purposes. It is not an appraisal and is often far from the sale price.
- Assessed value
- $106,980The portion of market value that taxes are calculated on (capped by law for small homes).
- Taxable value (final)
- $22,786Assessed value minus any exemptions.
- Tax class
- Tax class 1 – 1–3 family homes (and some small mixed-use / vacant lots)
| Tax year | Roll | Market value | Assessed value | Tax class |
|---|---|---|---|---|
| 2027 | Final | $1,783,000 | $106,980 | 1 |
| 2026 | Final | $1,886,000 | $113,160 | 1 |
| 2025 | Final | $1,660,000 | $99,600 | 1 |
Source: DOF Property Valuation and Assessment Data — city dataset updated 2026-09-14; data as of 2026-10-31
Sales & deed history 3
Deeds recorded with the City Register (ACRIS). A deed transfers ownership. A $0 or very low price usually means a transfer between related parties, an estate, or a refinance-related transfer, not a market sale. This is not a title search; mortgages, liens and other documents are not shown.
| Date | Type | Price | Seller (grantor) | Buyer (grantee) | Doc ID |
|---|---|---|---|---|---|
| 2000-07-26 | DEED | $0 / not stated | 671 Kinck Realty Corp | Cornielle, Daysi; Cornielle, Raimon | FT_3080007314608 |
| 1993-08-17 | DEED | $0 / not stated | Brown, Vera/Est Of | 671 Knick Realty Corp | FT_3170001797017 |
| 1969-05-19 | DEED | $0 / not stated | Mueller Lydia | Haffner Hugo C; Brown Vera | BK_6930033401294 |
Source: ACRIS Real Property Master — city dataset updated 2026-10-08; data as of 2026-10-31; ACRIS Real Property Legals — city dataset updated 2026-10-08; data as of 2026-10-31; ACRIS Real Property Parties — city dataset updated 2026-10-08; data as of 2026-10-31
DOB job filings 0 open of 0
A “job” is an application to the Department of Buildings to do construction work. A job marked Permitted, not signed off had a work permit issued but the city has no record of final sign-off (inspection/completion). Old jobs left in this state are common and appear in buyer and lender due diligence; the work may or may not have been done.
No records found in this dataset for this lot.
Source: DOB NOW: Build – Job Application Filings — city dataset updated 2026-10-30; data as of 2026-10-31; DOB Job Application Filings (BIS) — city dataset updated 2026-10-30; data as of 2026-10-31
Work permits 0
Individual permits issued under DOB jobs (one job can have several permits, e.g. plumbing and construction). Permit expiration alone does not mean the job was completed or signed off.
No records found in this dataset for this lot.
Source: DOB NOW: Build – Approved Permits — city dataset updated 2026-10-30; data as of 2026-10-31; DOB Permit Issuance (BIS) — city dataset updated 2026-10-31; data as of 2026-10-31
DOB violations 8 active of 8
Violations issued by the Department of Buildings for building-code or zoning conditions. Active means DOB has not recorded the violation as resolved or dismissed. Many active DOB violations are old (e.g. elevator or boiler inspection paperwork).
| Status | Issued | Type | Description | Number |
|---|---|---|---|---|
| Active V-DOB VIOLATION - ACTIVE | 2023-06-30 | LBLVIO-LOW PRESSURE BOILER BOILER REQUIRED | VIOLATION ISSUED-FAILURE TO FILE 2020 EXTERNAL LOW PRESSURE INSPECTION | V063023LBLVIO12983 |
| Active V-DOB VIOLATION - ACTIVE | 2023-06-30 | LBLVIO-LOW PRESSURE BOILER BOILER REQUIRED | VIOLATION ISSUED-FAILURE TO FILE 2021 EXTERNAL LOW PRESSURE INSPECTION | V063023LBLVIO33352 |
| Active V-DOB VIOLATION - ACTIVE | 2023-06-20 | LBLVIO-LOW PRESSURE BOILER BOILER REQUIRED | VIOLATION ISSUED-FAILURE TO FILE 2018 EXTERNAL LOW PRESSURE INSPECTION | V062023LBLVIO12502 |
| Active V-DOB VIOLATION - ACTIVE | 2023-06-20 | LBLVIO-LOW PRESSURE BOILER BOILER REQUIRED | VIOLATION ISSUED-FAILURE TO FILE 2019 EXTERNAL LOW PRESSURE INSPECTION | V062023LBLVIO33884 |
| Active V-DOB VIOLATION - ACTIVE | 2023-04-25 | LBLVIO-LOW PRESSURE BOILER BOILER REQUIRED | VIOLATION ISSUED-FAILURE TO FILE 2022 EXTERNAL LOW PRESSURE INSPECTION | V042523LBLVIO16644 |
| Active V-DOB VIOLATION - ACTIVE | 2019-11-08 | LBLVIO-LOW PRESSURE BOILER BOILER REQUIRED | VIOLATION ISSUED FOR FAILURE TO FILE ANNUAL BOILER 2017 INSPECTION REPORT | V110819LBLVIO10826 |
| Active V-DOB VIOLATION - ACTIVE | 2018-04-06 | LBLVIO-LOW PRESSURE BOILER BOILER REQUIRED | VIOLATION ISSUED FOR FAILURE TO FILE ANNUAL BOILER 2016 INSPECTION REPORT | V040618LBLVIO13304 |
| Active V-DOB VIOLATION - ACTIVE | 2015-03-03 | LBLVIO-LOW PRESSURE BOILER BOILER REQUIRED | VIOLATION ISSUED FOR FAILURE TO FILE ANNUAL BOILER 2013 INSPECTION REPORT | V030315LBLVIO10925 |
Source: DOB Violations — city dataset updated 2026-10-31; data as of 2026-10-31
ECB violations (DOB) 0 active of 1
DOB violations that go to a hearing at OATH (formerly the Environmental Control Board) and can carry fines. Active means the condition has not been certified as corrected and/or the case is not resolved. A balance due is a fine the city says is unpaid.
| Status | Issued | Severity | What it was for | Penalty / paid / balance | ECB # |
|---|---|---|---|---|---|
| Resolved DISMISSED · N/A - DISMISSED | 1994-01-24 | Non-Hazardous | NEW KITCHEN 7 BATHROOM 2&3 FLOORS KITCHEN SINK & BATHROOMS VERTS REMOVED 7 KITCHENS WAST DORM SIZE OT 1 1/2 PLUMBING WORK WITHOUT A PERMIT REMEDY OBTAIN A PERMIT IF FEASIBLE OR RESTORE TO PRIOR LEGAL CONDITION | $0 / $0 / $0 | 34105128L |
Source: DOB ECB Violations — city dataset updated 2026-10-31; data as of 2026-10-31
OATH tickets (all agencies) 0 unpaid of 9
Summonses heard at the Office of Administrative Trials and Hearings, from agencies like Sanitation, Buildings, Fire and Health, linked to this lot’s block and lot. Default means the respondent did not appear at the hearing, which typically results in the maximum penalty. Tickets may be issued to tenants or businesses at the address, not just the owner. DOB ECB tickets appear here too.
| Status | Date | Agency | Charge | Respondent | Imposed / paid / balance | Ticket # |
|---|---|---|---|---|---|---|
| No balance due PAID IN FULL · IN VIOLATION | 2023-06-24 | Sanitation Others | FAILURE TO CLEAN 18 INCHES INTO STREET | CORNIELLE DAYSI | $50 / $50 / $0 | 047904337K |
| No balance due PAID IN FULL · IN VIOLATION | 2021-05-18 | Sanitation Others | FAILURE TO CLEAN 18 INCHES INTO STREET | CORNIELLE DAYSI | $100 / $100 / $0 | 047179530N |
| No balance due PAID IN FULL | 2019-06-06 | Sanitation Others | LOOSE RUBBISH | CORNIELLE | $100 / $100 / $0 | 0208484064 |
| No balance due HEARING COMPLETED · DISMISSED | 2016-08-23 | FAILURE TO CLEAN 18 INCHES INTO STREET | CORNIELLE | — / — / — | 040574236H | |
| No balance due HEARING COMPLETED · DISMISSED | 2016-04-04 | FAILURE TO CLEAN 18 INCHES INTO STREET | CORNILLE | — / — / — | 0189068835 | |
| No balance due PAID IN FULL | 2007-07-05 | Dos - Enforcement Agents | NON-RECYCLABLES LEFT IN RECYCLING CONTAINER FOR COLLECTION | CORNIELLE | $25 / $25 / — | 041840416K |
| No balance due PAID IN FULL | 2004-04-10 | $100 / $100 / — | 0142130955 | |||
| No balance due PAID IN FULL | 2001-11-24 | $25 / $25 / — | 0126706140 | |||
| No balance due PAID IN FULL | 2001-07-09 | $50 / $50 / — | 0118372789 |
Source: OATH Hearings Division Case Status — city dataset updated 2026-10-31; data as of 2026-10-31
HPD registration & contacts
Owners of most rental buildings must register with the Department of Housing Preservation and Development each year and list an owner and managing agent.
No HPD registration found. Registration is required for buildings with 3 or more apartments (and for 1–2 family homes where neither the owner nor family lives there).
Source: HPD Multiple Dwelling Registrations — city dataset updated 2026-10-28; data as of 2026-10-31; HPD Registration Contacts — city dataset updated 2026-10-28; data as of 2026-10-31
HPD housing-code violations 1 open of 1
Violations HPD inspectors issued for conditions in residential buildings (heat, leaks, mold, pests, lead paint, etc.). Class letters show how serious: Class A – non-hazardous (HPD gives 90 days to correct); Class B – hazardous (30 days to correct); Class C – immediately hazardous (24 hours to correct for most conditions); Class I – information / order (e.g. orders to register, lead or other administrative orders). Open means HPD has not recorded the condition as corrected.
| Status | Class | Issued | Apt | Condition |
|---|---|---|---|---|
| Open Nov Sent Out · 2009-09-03 | B | 2009-09-03 | 3 | SECTION 27-2018 ADMIN. CODE: ABATE THE NUISANCE CONSISTING OF VERMIN MICE IN THE ENTIRE APARTMENT LOCATED AT APT 3, 3rd STORY |
Source: HPD Housing Maintenance Code Violations — city dataset updated 2026-10-31; data as of 2026-10-31
HPD complaints 0
Complaints tenants or others made to HPD (usually via 311) about housing conditions, from 2019 onward. A complaint is not a violation; HPD may inspect and issue one.
No records found in this dataset for this lot.
Source: HPD Housing Maintenance Code Complaints and Problems — city dataset updated 2026-10-31; data as of 2026-10-31
311 requests (last 12 months) 2
Recent 311 service requests the city geocoded to this lot: noise, illegal parking, heat, sanitation and more. Anyone can file them, so they describe activity at or near the address, not necessarily the building itself.
| Opened | Agency | Complaint | Status | Closed |
|---|---|---|---|---|
| 2026-10-25 | DSNY | Graffiti – Graffiti | Open | — |
| 2026-05-05 | DEP | Noise – Noise: air condition/ventilation equipment (NV1) | Closed | 2026-05-07 |
Source: 311 Service Requests from 2020 to Present — city dataset updated 2026-10-31; data as of 2026-10-31
Nearby properties
On Knickerbocker Ave
- 673 Knickerbocker Avenue (one open item)
- 675 Knickerbocker Avenue
- 667 Knickerbocker Avenue (three open items)
- 677 Knickerbocker Avenue (12 open items)
- 665 Knickerbocker Avenue (44 open items)
- 679 Knickerbocker Avenue (three open items)
- 663 Knickerbocker Avenue (64 open items)
- 660 Knickerbocker Avenue (24 open items)
- 683 Knickerbocker Avenue (one open item)
- 657 Knickerbocker Avenue (42 open items)
Same tax block (3378)
- 685 Knickerbocker Avenue (16 open items)
- 683 Knickerbocker Avenue (one open item)
- 679 Knickerbocker Avenue (three open items)
- 677 Knickerbocker Avenue (12 open items)
- 675 Knickerbocker Avenue
- 673 Knickerbocker Avenue (one open item)
- 667 Knickerbocker Avenue (three open items)
- 665 Knickerbocker Avenue (44 open items)
- 663 Knickerbocker Avenue (64 open items)
- 1398 Putnam Avenue (four open items)
All properties on Knickerbocker Ave, Brooklyn · All of Brooklyn 11221 (Bedford-Stuyvesant (East))
Open-item counts as of October 31, 2026; each section lists its own dataset date. Machine-readable: JSON API · Markdown · API & MCP docs