437 Classon Avenue, Brooklyn, NY 11238
BBL 3019730009 (Borough 3, Block 1973, Lot 9) · BIN 3056526 · Last updated:
Summary · as of November 6, 2026
437 Classon Avenue (Brooklyn, NY 11238; tax lot BBL 3019730009) is a two-family home (building class B1: two-family home, brick), built around 1930, on a 1,260 sq ft lot zoned R6B. City tax records list the owner as KOIVISTO, ERIC; per ACRIS, a deed to this owner dated January 25, 2016 lists a price of $2,450,000. The Department of Finance's final market value for tax year 2027 is $2,737,000. As of November 6, 2026, NYC Open Data shows one OATH ticket with an unpaid balance. (Source: NYC Open Data — DOB, HPD, OATH, DOF, DCP and ACRIS datasets — compiled by NYC Property Facts.)
- Owner of record
- KOIVISTO, ERIC
- Building class
- B1 · Two-family home, brick
- Year built · units
- 1930 · 2 res.
- Lot area · zoning
- 1,260 sq ft · R6B
- Market value (DOF)
- $2,737,000 FY2027
- Last priced deed
- $2,450,000 · 2016-01-25
- BBL
- 3019730009
- BIN
- 3056526
- 0Open DOB jobs (permit issued, no sign-off)
- 0Active DOB violations
- 0Active ECB violations
- 0Open HPD violations
- 1OATH tickets with unpaid balance
How to cite: NYC Property Facts, “437 Classon Avenue, Brooklyn, NY 11238 (BBL 3019730009)”, data as of 2026-11-06, https://nycpropertyfacts.com/ny/brooklyn/437-classon-avenue-3019730009. 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)
- KOIVISTO, ERICThe owner name on the city’s tax records. It can lag behind recent sales and is often an LLC.
- Building class
- B1 – Two-family home, brickThe Department of Finance’s category for what kind of building this is.
- Land use
- One- & two-family buildingsCity Planning’s broad category of how the lot is used.
- Year built
- 1930Often an estimate for older buildings. Major alteration recorded: 2014.
- Floors
- 3
- Units
- 2 residential / 2 totalResidential units are apartments; total includes stores and offices.
- Buildings on lot
- 1
- Lot size
- 1,260 sq ft (15.75 ft × 80 ft)
- Building floor area
- 2,646 sq ft
- Zoning
- R6BThe zoning district sets what can be built and used here. Residential district.
- Built vs. allowed density (FAR)
- 2.10 built / 2.00 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 3019730009 (Borough 3, Block 1973, Lot 9) · BIN 3056526BBL 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 2026-11-07; Building Footprints — city dataset updated 2026-10-25; data as of 2026-11-01
Tax assessment
How the Department of Finance values this lot for property tax.
- Market value (tax year 2027, final roll)
- $2,737,000The 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
- $164,220The portion of market value that taxes are calculated on (capped by law for small homes).
- Taxable value (final)
- $64,951Assessed 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 | $2,737,000 | $164,220 | 1 |
| 2026 | Final | $3,142,000 | $188,520 | 1 |
| 2025 | Final | $2,482,000 | $148,920 | 1 |
Source: DOF Property Valuation and Assessment Data — city dataset updated 2026-09-14; data as of 2026-11-07
Sales & deed history 5
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 |
|---|---|---|---|---|---|
| 2016-01-25 | DEED | $2,450,000 | Market Impact Llc | Faude-Koivisto, Tanya; Koivisto, Eric | 2016012701082001 |
| 2014-05-14 | DEED | $950,000 | Sage, Calvin T | Market Impact, Llc | 2014052701864001 |
| 1983-11-28 | DEED | $0 / not stated | Taylor, Rudolph Distof; Taylor, Hattie M | Sage, Calvin T | FT_3950000991295 |
| 1980-08-05 | DEED | $0 / not stated | Holy Trinity Light Of The World Commandment Keeper | Taylor Rudolph | BK_8030117700029 |
| 1966-11-18 | DEED | $0 / not stated | Smith Thelma L | Holy Trinity Light Of The World Commandment Keeper | BK_6630029500280 |
Source: ACRIS Real Property Master — city dataset updated 2026-10-08; data as of 2026-11-07; ACRIS Real Property Legals — city dataset updated 2026-10-08; data as of 2026-11-07; ACRIS Real Property Parties — city dataset updated 2026-10-08; data as of 2026-11-07
DOB job filings 0 open of 4
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.
| Status | Job # | Type | Filed | Est. cost |
|---|---|---|---|---|
| Not open SIGNED OFF · 2023-03-08 | 340873665 BIS | A2 – Alteration with multiple work types (no change to use/occupancy) | 2022-12-05 | $54,320 |
| Not open PLAN EXAM - APPROVED · 2017-07-25 | 321620698 BIS | A2 – Alteration with multiple work types (no change to use/occupancy) | 2017-07-25 | $13,700 |
| Not open SIGNED OFF · 2016-01-14 | 321022816 BIS | A1 – Major alteration (changes use, egress or occupancy) | 2014-10-31 | $121,800 |
| Not open SIGNED OFF · 2015-11-13 | 340139326 BIS | A2 – Alteration with multiple work types (no change to use/occupancy) | 2014-04-28 | $7,200 |
Source: DOB NOW: Build – Job Application Filings — city dataset updated 2026-11-06; data as of 2026-11-07; DOB Job Application Filings (BIS) — city dataset updated 2026-11-05; data as of 2026-11-06
Work permits 7
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.
| Issued | Expires | Job # | Work | Permit status |
|---|---|---|---|---|
| 2023-01-24 | 2023-06-12 | 340873665 BIS | Equipment work / Other / general construction | ISSUED (initial) |
| 2015-10-23 | 2016-10-22 | 321022816 BIS | Plumbing / Plumbing | ISSUED (renewal) |
| 2015-06-26 | 2016-06-25 | 321022816 BIS | Alteration | ISSUED (renewal) |
| 2014-12-02 | 2015-06-29 | 321022816 BIS | Alteration | ISSUED (initial) |
| 2014-12-01 | 2015-12-01 | 321022816 BIS | Plumbing / Plumbing | ISSUED (initial) |
| 2014-07-29 | 2015-06-29 | 340139326 BIS | Equipment work / Other / general construction | ISSUED (renewal) |
| 2014-06-02 | 2014-06-29 | 340139326 BIS | Equipment work / Other / general construction | ISSUED (initial) |
Source: DOB NOW: Build – Approved Permits — city dataset updated 2026-11-06; data as of 2026-11-07; DOB Permit Issuance (BIS) — city dataset updated 2026-11-07; data as of 2026-11-07
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 — city dataset updated 2026-11-06; data as of 2026-11-07
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 or Resolved follows the DOB violation status field. The hearing status is about the hearing and its penalty: written off means the city stopped collecting the fine, not that the condition was corrected. A balance due is a fine the city says is unpaid.
| Status | Issued | Severity | What it was for | Penalty / paid / balance | ECB # |
|---|---|---|---|---|---|
| Resolved Hearing: DISMISSED · Certification: N/A - DISMISSED | 2014-05-16 | CLASS - 1 | FAILURE TO MAINTAIN EXTERIOR BLDG WALL OR APPURTENANCES.AT 1FL FRONT MASONARY ORNMENTAL EXTERIOR PROTRUDING DOOR FRAME DISLOADGE FROM PREMISES AND FELL TO GRADE.MAINTAIN EXTERIOR BLDG WALL | $0 / $0 / $0 | 35095619X |
Source: DOB ECB Violations — city dataset updated 2026-11-06; data as of 2026-11-07
OATH tickets (all agencies) 1 unpaid of 10
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 # |
|---|---|---|---|---|---|---|
| Unpaid balance Default DOCKETED · DEFAULTED | 2020-03-24 | Sanitation Others | IMPROPER DISPOSAL BEDDING 1ST OFFENSE | LESTER E | $300 / $0 / $300 | 0210506488 |
| No balance due PAID IN FULL · IN VIOLATION | 2017-03-01 | Fire Department Of Nyc | FIRE PROTECTION SYSTEMS:FAIL TO PREVENT UNNECESSARY UNWARRANTED ALARMS | KOIVISTO ERIC | $375 / $376 / $0 | 012062283X |
| No balance due HEARING COMPLETED · DISMISSED | 2014-05-16 | Dept. Of Buildings | FAILURE TO MAINTAIN BUILDING WALL S OR APPURTENANCES | CALVIN SAGE | — / — / — | 035095619X |
| No balance due WRITTEN OFF · WRITTEN OFF | 2014-05-07 | Dos - Enforcement Agents | LOOSE RUBBISH | SAGE | $300 / $0 / $0 | 044360337Z |
| No balance due PAID IN FULL | 2009-09-02 | Sanitation Others | FAILURE TO BUNDLE NEWSPAPERS MAGAZINES CARDBOARD | SABE | $25 / $25 / — | 0170718296 |
| No balance due PAID IN FULL | 2007-08-01 | Sanitation Others | FAILURE TO PROPERLY PUT RECYCLABLES OUT FOR COLLECTION | SAGE | $25 / $25 / — | 0158441681 |
| No balance due Default PAID IN FULL · DEFAULTED | 2007-06-20 | Dos - Enforcement Agents | NON-RECYCLABLES LEFT IN RECYCLING CONTAINER FOR COLLECTION | SAGE | $25 / $25 / — | 041340198K |
| No balance due PAID IN FULL | 2003-07-23 | $25 / $25 / — | 0136951239 | |||
| No balance due PAID IN FULL | 2003-07-03 | $100 / $100 / — | 0136854163 | |||
| No balance due WRITTEN OFF · WRITTEN OFF | 1998-06-09 | Fire Department Of Nyc | FAIL TO PROVIDE MAINTAIN ELECTRIC EQUIP. | CALVIN T. SAGE | $2,000 / $0 / $0 | 010475309H |
Source: OATH Hearings Division Case Status — city dataset updated 2026-11-07; data as of 2026-11-07
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 2026-11-04; data as of 2026-11-07; HPD Registration Contacts — city dataset updated 2026-11-04; data as of 2026-11-07
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 — city dataset updated 2026-11-06; data as of 2026-11-07
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 2026-11-07; data as of 2026-11-07
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 — city dataset updated 2026-11-07; data as of 2026-11-07
Nearby properties
More in Prospect Heights: Open HPD violations · Active DOB violations · Active ECB violations · Open DOB jobs · Unpaid OATH tickets
On Classon Ave
- 436 Classon Avenue
- 438 Classon Avenue
- 439 Classon Avenue (nine open items)
- 435a Classon Avenue
- 435 Classon Avenue
- 434 Classon Avenue (nine open items)
- 441a Classon Avenue (17 open items)
- 441 Classon Avenue (one open item)
- 433 Classon Avenue
- 442 Classon Avenue
Same tax block (1973)
- 451 Classon Avenue (43 open items)
- 449 Classon Avenue (56 open items)
- 447 Classon Avenue
- 445 Classon Avenue (three open items)
- 443 Classon Avenue (11 open items)
- 441a Classon Avenue (17 open items)
- 441 Classon Avenue (one open item)
- 439 Classon Avenue (nine open items)
- 435a Classon Avenue
- 435 Classon Avenue
All properties on Classon Ave, Brooklyn · All of Brooklyn 11238
Open-item counts as of November 6, 2026; each section lists its own dataset date. Machine-readable: JSON API · Markdown · Plain text · API & MCP docs