# 643 Knickerbocker Avenue, Brooklyn, NY 11221 BBL 3033650109 · Block 3365 · Lot 109 · BIN 3076917 Canonical page: https://nycpropertyfacts.com/ny/brooklyn/643-knickerbocker-avenue-3033650109 Last updated: 2026-10-31 · Open-item counts as of 2026-10-31 ## Summary 643 Knickerbocker Avenue (Brooklyn, NY 11221; tax lot BBL 3033650109) is a 5-unit walk-up apartment building (building class C2: walk-up apartments, five or six families), built around 1915, on a 1,750 sq ft lot zoned R6. City tax records list the owner as 4MB FUND TENTH REALTY INC.; per ACRIS, a deed to this owner dated March 15, 2018 lists a price of $875,000. The Department of Finance's final market value for tax year 2027 is $1,073,000. As of October 31, 2026, NYC Open Data shows three OATH tickets with an unpaid balance. (Source: NYC Open Data — DOB, HPD, OATH, DOF, DCP and ACRIS datasets — compiled by NYC Property Facts.) How to cite: NYC Property Facts, “643 Knickerbocker Avenue, Brooklyn, NY 11221 (BBL 3033650109)”, data as of 2026-10-31, https://nycpropertyfacts.com/ny/brooklyn/643-knickerbocker-avenue-3033650109. Source: NYC Open Data. ## Open items | Item | Count | |---|---| | Open DOB jobs (permit issued, not signed off) | 0 | | Active DOB violations | 0 | | Active ECB violations | 0 | | Open HPD violations | 0 | | OATH tickets with unpaid balance | 3 | ## Lot & building - Owner of record: 4MB FUND TENTH REALTY INC. - Building class: C2 – Walk-up apartments, five or six families - Year built: 1915 - Floors: 4 - Units: 5 residential / 5 total - Lot area: 1,750 sq ft · Building area: 3,898 sq ft - Zoning: R6 - Source: PLUTO (Dept. of City Planning) (https://data.cityofnewyork.us/d/64uk-42ks), data as of 2026-11-01 ## Tax assessment - Tax year 2027 (final roll): market value $1,073,000, assessed value $482,850, tax class 2A - 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 | |---|---|---|---| | 2018-03-15 | recorded (DEED) | DEED dated 2018-03-15 from DE MONTAS, NORA; MONTAS , NORA to 4MB FUND TENTH REALTY INC., stated price $875,000. | bnx9-e6tj | | 1969-07-23 | recorded (DEED) | DEED dated 1969-07-23 from SEPULVEDA CALEB to S&R BROKERS INC, no price stated ($0). | bnx9-e6tj | | 1969-07-14 | recorded (DEED) | DEED dated 1969-07-14 from S&R BROKERS INC to DEMONTAS NORA; DEMONTAS RAFEL, no price stated ($0). | bnx9-e6tj | | 1967-04-13 | recorded (DEED) | DEED dated 1967-04-13 from BARBERA MARY; BARBERA SALVATORE to SEPULVEDA CALEB, 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 | |---|---|---|---| | 2019-04-12 | n/a (ISSUED (renewal)) | BIS work permit for job 321707131: Alteration. Issued 2019-04-12, expires 2020-10-31. | ipu4-2q9a | | 2019-02-26 | n/a (ISSUED (initial)) | BIS work permit for job 321707131: Plumbing / Plumbing. Issued 2019-02-26, expires 2020-02-26. | ipu4-2q9a | | 2019-01-14 | n/a (Signed-off) | DOB NOW work permit for job B00098783-I1: Supported Scaffold — PROPOSED INSTALLATION OF TEMPORARY PIPE SCAFFOLD AS PER PLANS. WORK SHALL COMPLY WITH CHAPTER #33 OF THE NYC BUILDING CODE. NO CHANGE IN USE, OCCUPANCY, OR EGR…. Issued 2019-01-14, expires 2019-09-21. | rbx6-tga4 | | 2019-01-11 | n/a (Signed-off) | DOB NOW work permit for job B00098772-I1: Sidewalk Shed — PROPOSED INSTALLATION OF HEAVY DUTY SIDEWALK SHED AS PER PLANS. LIVE LOAD 300 LBS PER SQUARE FEET. SIDEWALK SHED SHALL COMPLY WITH CHAPTER #33 OF THE NYC BUILD…. Issued 2019-01-11, expires 2019-09-21. | rbx6-tga4 | | 2018-11-14 | n/a (Signed-off) | DOB NOW work permit for job B00098772-I1: Sidewalk Shed — PROPOSED INSTALLATION OF HEAVY DUTY SIDEWALK SHED AS PER PLANS. LIVE LOAD 300 LBS PER SQUARE FEET. SIDEWALK SHED SHALL COMPLY WITH CHAPTER #33 OF THE NYC BUILD…. Issued 2018-11-14, expires 2019-09-21. | rbx6-tga4 | | 2018-11-14 | n/a (ISSUED (initial)) | BIS work permit for job 321707131: Alteration. Issued 2018-11-14, expires 2019-04-04. | ipu4-2q9a | | 2018-11-13 | n/a (Signed-off) | DOB NOW work permit for job B00098783-I1: Supported Scaffold — PROPOSED INSTALLATION OF TEMPORARY PIPE SCAFFOLD AS PER PLANS. WORK SHALL COMPLY WITH CHAPTER #33 OF THE NYC BUILDING CODE. NO CHANGE IN USE, OCCUPANCY, OR EGR…. Issued 2018-11-13, expires 2019-09-21. | rbx6-tga4 | ## Open violations (DOB, ECB, HPD) status "open" = DOB violation category is ACTIVE, ECB violation status is ACTIVE, or HPD violation status is Open. No records found. ## 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 | |---|---|---|---| | 2025-07-12 | open (DOCKETED · DEFAULTED) | OATH ticket from Dos - Enforcement Agents: LOOSE RUBBISH 1ST OCCURRENCE. Unpaid balance $300. Respondent defaulted (did not appear). | jz4z-kudi | | 2024-12-06 | open (DOCKETED · DEFAULTED) | OATH ticket from Dos - Enforcement Agents: SPILLAGE FROM A RECEPTACLE 1ST OFFENSE. Unpaid balance $100. Respondent defaulted (did not appear). | jz4z-kudi | | 2021-02-26 | open (DOCKETED · DEFAULTED) | OATH ticket from Sanitation Others: FAILURE TO CLEAN 18 INCHES INTO STREET. Unpaid balance $300. Respondent defaulted (did not appear). | jz4z-kudi | ## Complaints (HPD since 2019, 311 last 12 months) Complaints are reports, not violations. status mirrors the published complaint / request status. No records found. ## 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 4MB FUND TENTH REALTY INC.. | 64uk-42ks | | 2018-03-15 | recorded | Grantee (buyer) on the most recent deed (DEED, 2018-03-15). | 636b-3b5g | --- 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/3033650109