Independent site. Data from NYC Open Data; not affiliated with the City of New York.

NYC Property Factsfree public-records reference

421 Grove Street, Brooklyn, NY 11237

BBL 3033200040 (Borough 3, Block 3320, Lot 40) · BIN 3076012 · Last updated:

Summary · as of October 31, 2026

421 Grove Street (Brooklyn, NY 11237; tax lot BBL 3033200040) is a 3-unit walk-up apartment building (building class C0: three-family walk-up), built around 1920, on a 2,000 sq ft lot zoned R6. City tax records list the owner as WU, ALFREDO HUNG FAN. The Department of Finance's final market value for tax year 2027 is $1,233,000. As of October 31, 2026, the datasets loaded so far show no open items for this lot. Not yet loaded on this site: DOB Job Application Filings (BIS); DOB NOW: Build – Job Application Filings; DOB Violations; DOB ECB Violations; HPD Housing Maintenance Code Violations; OATH Hearings Division Case Status. (Source: NYC Open Data — DOB, HPD, OATH, DOF, DCP and ACRIS datasets — compiled by NYC Property Facts.)

Owner of record
WU, ALFREDO HUNG FAN
Building class
C0 · Three-family walk-up
Year built · units
1920 · 3 res.
Lot area · zoning
2,000 sq ft · R6
Market value (DOF)
$1,233,000 FY2027
Last priced deed
—
BBL
3033200040
BIN
3076012

How to cite: NYC Property Facts, “421 Grove Street, Brooklyn, NY 11237 (BBL 3033200040)”, data as of 2026-10-31, https://nycpropertyfacts.com/ny/brooklyn/421-grove-street-3033200040. 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)
WU, ALFREDO HUNG FANThe owner name on the city’s tax records. It can lag behind recent sales and is often an LLC.
Building class
C0 – Three-family walk-upThe Department of Finance’s category for what kind of building this is.
Land use
Multi-family walk-up buildingsCity Planning’s broad category of how the lot is used.
Year built
1920Often an estimate for older buildings.
Floors
2
Units
3 residential / 3 totalResidential units are apartments; total includes stores and offices.
Buildings on lot
1
Lot size
2,000 sq ft (20 ft × 100 ft)
Building floor area
2,700 sq ft
Zoning
R6The zoning district sets what can be built and used here. Residential district.
Built vs. allowed density (FAR)
1.35 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 3033200040 (Borough 3, Block 3320, Lot 40) · BIN 3076012BBL identifies the tax lot; BIN identifies each building (from DOB/HPD/footprint records).

Source: PLUTO (Dept. of City Planning) — not yet loaded; Building Footprints — not yet loaded

Tax assessment

How the Department of Finance values this lot for property tax.

Market value (tax year 2027, final roll)
$1,233,000The 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
$73,980The portion of market value that taxes are calculated on (capped by law for small homes).
Taxable value (final)
$21,238Assessed value minus any exemptions.
Tax class
7833
Tax yearRollMarket valueAssessed valueTax class
2027Final$1,233,000$73,9807833
2026Final$1,159,000$69,5407833
2025Final$1,364,000$81,8407833

Source: DOF Property Valuation and Assessment Data — not yet loaded

Sales & deed history 2

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.

DateTypePriceSeller (grantor)Buyer (grantee)Doc ID
2021-09-2013821$0 / not statedWu, Min Er Mai; Wu, Alfredo Hung Fan; Mai, Min ErWu, Alfredo Hung Fan; Mai, Min Er2021092000405001
1989-04-2013821$0 / not statedHegmann, Catherine/IndiWu, Alfredo Hung Fan; Wu, Min Er Mai20003030001450803

Source: ACRIS Real Property Master — not yet loaded; ACRIS Real Property Legals — not yet loaded; ACRIS Real Property Parties — not yet loaded

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 — not yet loaded; DOB Job Application Filings (BIS) — not yet loaded

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 — not yet loaded; DOB Permit Issuance (BIS) — not yet loaded

DOB violations 0 active of 0

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).

No records found in this dataset for this lot.

Source: DOB Violations — not yet loaded

ECB violations (DOB) 0 active of 0

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.

No records found in this dataset for this lot.

Source: DOB ECB Violations — not yet loaded

OATH tickets (all agencies) 0 unpaid of 8

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.

StatusDateAgencyChargeRespondentImposed / paid / balanceTicket #
No balance due
13739
2025-09-251376217706WU ALFREDO HUNG FAN$25 / $25 / $0049256183R
No balance due
13739
2011-02-221442816525MIN ER MAI WU$100 / $100 / —042762842Z
No balance due
13665 · 13587
2008-03-221440215158MIN ER MAI WU— / — / —042171094H
No balance due
13665 · 13587
2007-09-081376215158MIN ER MAI WU— / — / —040510809N
No balance due
13739
2004-09-11$25 / $25 / —0144171089
No balance due
13739
2003-06-28$25 / $25 / —0136633238
No balance due
13739 · 13580
2002-01-29$80 / $50 / —0127877247
No balance due
13739 · 13682
2002-01-10$50 / $50 / —0121653905

Source: OATH Hearings Division Case Status — not yet loaded

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 — not yet loaded; HPD Registration Contacts — not yet loaded

HPD housing-code violations 0 open of 0

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.

No records found in this dataset for this lot.

Source: HPD Housing Maintenance Code Violations — not yet loaded

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 — not yet loaded

311 requests (last 12 months) 0

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.

No records found in this dataset for this lot.

Source: 311 Service Requests from 2020 to Present — not yet loaded

Nearby properties

On Grove St

Same tax block (3320)

All properties on Grove St, Brooklyn · All of Brooklyn 11237 (Bushwick (West))

Open-item counts as of October 31, 2026; each section lists its own dataset date. Machine-readable: JSON API · Markdown · API & MCP docs