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509 80th Street, Bay Ridge, Brooklyn, NY 11209

BBL 3059810080 (Borough 3, Block 5981, Lot 80) · BIN 3151007 · Last updated: · Bay Ridge · ZIP 11209

Also recorded in city data as: 507 80 St

Summary · as of November 10, 2026

509 80th Street (Brooklyn, NY 11209; tax lot BBL 3059810080) is a 2-unit mixed-use building with apartments and ground-floor commercial space (building class S9: mixed-use: dwelling with stores or offices, miscellaneous), built around 1930, on a 774 sq ft lot zoned R6B. City tax records list the owner as 509 80TH STREET REALTY LLC. The Department of Finance's final market value for tax year 2027 is $628,000. As of November 10, 2026 (limited by DOB Job Application Filings (BIS); other open-item sources were confirmed later), NYC Open Data shows one DOB job with a permit issued but no sign-off and seven active DOB violations. There was one 311 request 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
509 80TH STREET REALTY LLC
Building class
S9 · Mixed-use: dwelling with stores or offices, miscellaneous
Year built · units
1930 · 2 res.
Lot area · zoning
774 sq ft · R6B
Market value (DOF)
$628,000 FY2027
Last priced deed
—
BBL
3059810080
BIN
3151007

How to cite: NYC Property Facts, “509 80th Street, Brooklyn, NY 11209 (BBL 3059810080)”, data as of 2026-11-10, https://nycpropertyfacts.com/ny/brooklyn/509-80th-street-3059810080. 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)
509 80TH STREET REALTY LLCThe owner name on the city’s tax records. It can lag behind recent sales and is often an LLC.
Building class
S9 – Mixed-use: dwelling with stores or offices, miscellaneousThe 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
1930Often an estimate for older buildings.
Floors
3
Units
2 residential / 4 totalResidential units are apartments; total includes stores and offices.
Buildings on lot
1
Lot size
774 sq ft (24 ft × 32.25 ft)
Building floor area
2,304 sq ft (incl. 760 sq ft commercial)
Zoning
R6B, C1-3, BRThe 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)
2.98 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 3059810080 (Borough 3, Block 5981, Lot 80) · BIN 3151007BBL identifies the tax lot; BIN identifies each building (from DOB/HPD/footprint records).

Source: PLUTO (Dept. of City Planning) — city dataset updated 2026-08-24; last loaded 2026-11-12; Building Footprints — city dataset updated 2026-11-08; last loaded 2026-11-08; checked unchanged 2026-11-10

Tax assessment

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

Market value (tax year 2027, final roll)
$628,000The 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
$282,600The portion of market value that taxes are calculated on (capped by law for small homes).
Taxable value (final)
$168,373Assessed value minus any exemptions.
Tax class
Tax class 2A – residential rental, 4–6 units
Tax yearRollMarket valueAssessed valueTax class
2027Final$628,000$282,6002A
2026Final$523,000$235,3502A
2025Final$436,000$196,2002A

Source: DOF Property Valuation and Assessment Data — city dataset updated 2026-09-14; last loaded 2026-11-12

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.

DateTypePriceSeller (grantor)Buyer (grantee)Doc ID
2023-07-25DEED$0 / not statedEfstratios Vassilakos And Vassiliki Vassilakos; Polyxeni Vassilakos, As Trustee; Evangelia Diakoumakos, As Trustee509 80th Street Realty Llc2023080200773001
2008-05-06DEED, LE$0 / not statedVassilakos, Vasiliki; Vassilakos, EfstratiosEfstratios & Vasiliki Vassilakos Irrev.Trust; Evangelia Diakoumakos; Polyxeni Vassilakos2008062401466001
1970-08-14DEED$0 / not statedBosa Angelo; Bosa RosariaVassilakos Efstratios; Vassilakos VassilikiBK_7030042900385

Source: ACRIS Real Property Master — city dataset updated 2026-11-10; last loaded 2026-11-12; ACRIS Real Property Legals — city dataset updated 2026-11-10; last loaded 2026-11-12; ACRIS Real Property Parties — city dataset updated 2026-11-10; last loaded 2026-11-12

DOB job filings 1 open of 1

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.

StatusJob #TypeFiledEst. cost
Permitted, not signed off
PERMIT ISSUED - ENTIRE JOB/WORK · 2017-05-24
321517097
BIS
A2 – Alteration with multiple work types (no change to use/occupancy)2017-05-24$3,450

Source: DOB NOW: Build – Job Application Filings — city dataset updated 2026-11-10; last loaded 2026-11-11; DOB Job Application Filings (BIS) — city dataset updated 2026-11-09; last loaded 2026-11-10

Work permits 1

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.

IssuedExpiresJob #WorkPermit status
2017-05-242018-03-17321517097
BIS
Equipment work / Other / general constructionISSUED (initial)

Source: DOB NOW: Build – Approved Permits — city dataset updated 2026-11-09; last loaded 2026-11-10; DOB Permit Issuance (BIS) — city dataset updated 2026-11-07; last loaded 2026-11-07

DOB violations 7 active of 13

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). The active-DOB count in the summary also includes DOB NOW safety violations, listed in the next section.

StatusIssuedTypeDescriptionNumber
Active
V-DOB VIOLATION - ACTIVE
2015-10-01LBLVIO-LOW PRESSURE BOILER BOILER REQUIREDVIOLATION ISSUED FOR FAILURE TO FILE ANNUAL BOILER 2014 INSPECTION REPORTV100115LBLVIO06805
Active
V-DOB VIOLATION - ACTIVE
2013-03-01LBLVIO-LOW PRESSURE BOILER BOILER REQUIREDVIOLATION ISSUED FOR FAILURE TO FILE ANNUAL BOILER 2011 INSPECTION REPORTV030113LBLVIO10981
Active
V-DOB VIOLATION - ACTIVE
2011-12-13LBLVIO-LOW PRESSURE BOILER BOILER REQUIREDVIOLATION ISSUED FOR FAILURE TO FILE ANNUAL BOILER 2010 INSPECTION REPORTV121311LBLVIO14430
Active
V-DOB VIOLATION - ACTIVE
2009-12-31LBLVIO-LOW PRESSURE BOILER BOILER REQUIREDV123109LBLVIO16762
Active
V-DOB VIOLATION - ACTIVE
2009-01-01LL6291-LOCAL LAW 62/91 - BOILERS BOILER REQUIREDV010109LL629112743
Active
V-DOB VIOLATION - ACTIVE
2008-01-03LL6291-LOCAL LAW 62/91 - BOILERS BOILER REQUIREDV010308LL629112777
Active
V-DOB VIOLATION - ACTIVE
1995-08-29LL6291-LOCAL LAW 62/91 - BOILERS BOILER REQUIREDV082995LL629126792
Resolved/dismissed
V*-DOB VIOLATION - DISMISSED
2018-04-06LBLVIO-LOW PRESSURE BOILER BOILER REQUIREDVIOLATION ISSUED FOR FAILURE TO FILE ANNUAL BOILER 2016 INSPECTION REPORTV*040618LBLVIO12660
Resolved/dismissed
V*-DOB VIOLATION - DISMISSED
2008-01-03LL6291-LOCAL LAW 62/91 - BOILERS BOILER REQUIREDV*010308LL629119201
Resolved/dismissed
V*-DOB VIOLATION - DISMISSED
2007-01-19LL6291-LOCAL LAW 62/91 - BOILERS BOILER REQUIREDV*011907LL629113201
Resolved/dismissed
V*-DOB VIOLATION - DISMISSED
2006-01-06LL6291-LOCAL LAW 62/91 - BOILERS BOILER REQUIREDV*010606LL629117333
Resolved/dismissed
V*-DOB VIOLATION - DISMISSED
2006-01-06LL6291-LOCAL LAW 62/91 - BOILERS BOILER REQUIREDV*010606LL629119008
Resolved/dismissed
V*-DOB VIOLATION - DISMISSED
2001-02-27LL6291-LOCAL LAW 62/91 - BOILERS BOILER REQUIREDV*022701LL629122840

Source: DOB Violations — city dataset updated 2026-11-11; last loaded 2026-11-11

DOB safety violations (DOB NOW) 0 active of 0

Safety violations DOB NOW publishes for devices such as boilers, elevators and gas piping (Local Law 152). Active means the published status is Active. Dismissed, cured, waived and successfully disputed violations are counted under “resolved or not active” and are not open items. Active ones are included in the summary’s active DOB violation total.

No records found in this dataset for this lot.

Source: DOB Safety Violations (DOB NOW) — city dataset updated 2026-11-11; last loaded 2026-11-11

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 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.

No records found in this dataset for this lot.

Source: DOB ECB Violations — city dataset updated 2026-11-11; last loaded 2026-11-11

OATH tickets (all agencies) 0 unpaid of 19

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
PAID IN FULL
2026-09-25Sanitation OthersIMPROPER RECEPTACLE FAILURE TO CONTAINERIZE - RESIDENTIAL 1ST509 80TH STREET REALTY LLC$50 / $50 / $0080127944P
No balance due
PAID IN FULL
2022-10-24Sanitation OthersDIRTY SIDEWALKWitness Tech Inc$50 / $50 / $0047420272H
No balance due
HEARING COMPLETED · DISMISSED
2016-08-01Dos - Enforcement AgentsSTORAGE OF RECEPTACLESVASSILAKOS— / — / —041629076J
No balance due
PAID IN FULL
2015-05-04Sanitation DeptSTORAGE OF RECEPTACLES - 2ND OFFENSEVASSILAKOS EFSTRATIOS$100 / $100 / —042285421L
No balance due
PAID IN FULL
2015-04-30Sanitation DeptSTORAGE OF RECEPTACLES - 2ND OFFENSEVASSILAKOS EFSTRATIOS$100 / $100 / —041497158L
No balance due
PAID IN FULL · IN VIOLATION
2014-11-03Dos - Enforcement AgentsSTORAGE OF RECEPTACLESVASSILAKOS$100 / $100 / —042065149R
No balance due
PAID IN FULL
2014-07-02Sanitation DeptSIDEWALK OBSTRUCTIONWitness Tech Inc$100 / $100 / —041648974P
No balance due
PAID IN FULL
2011-09-15Dos - Enforcement AgentsSTORAGE OF RECEPTACLESVASSILAKOS$100 / $100 / —041335061N
No balance due
PAID IN FULL
2011-09-15Dos - Enforcement AgentsSTORAGE OF RECEPTACLESVASSILAKOS$100 / $100 / —041335060L
No balance due
PAID IN FULL
2011-04-29Dos - Enforcement AgentsPOSTING OF SIGN PERMIT, WASTE REMOVALBORIC BROKERAGE INC$100 / $100 / —041354531M
No balance due
HEARING COMPLETED · DISMISSED
2009-09-19Sanitation OthersLOOSE RUBBISHVASSILAKOS— / — / —0171306879
No balance due
PAID IN FULL
2009-06-27Dos - Enforcement AgentsSTORAGE OF RECEPTACLESVASSILAKOS$100 / $200 / $-100041703374K

Showing 12 of 19 records. The API and the source dataset have the full list.

Source: OATH Hearings Division Case Status — city dataset updated 2026-11-11; last loaded 2026-11-12

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; last loaded 2026-11-10; HPD Registration Contacts — city dataset updated 2026-11-04; last loaded 2026-11-10

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 2026-11-11; last loaded 2026-11-11

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 2026-11-11; last loaded 2026-11-11

311 requests (last 12 months) 1

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.

OpenedAgencyComplaintStatusClosed
2026-06-01DCWPConsumer Complaint – Landlord or Real Estate AgentClosed2026-06-02

Source: 311 Service Requests from 2020 to Present — city dataset updated 2026-11-11; last loaded 2026-11-12

Nearby properties

Ordered by map distance among lots on this street within 40 house numbers and on this tax block within 15 lot numbers.

More in Bay Ridge: Open HPD violations · Active DOB violations · Active ECB violations · Open DOB jobs · Unpaid OATH tickets

Closest on 80 St

Same tax block (5981), closest first

All properties on 80 St, Brooklyn · Brooklyn 11209

Open-item counts as of November 10, 2026; each section lists its own dataset date. Machine-readable: JSON API · Markdown · Plain text · API & MCP docs