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189 Lefferts Place, Brooklyn, NY 11238

BBL 3020160061 (Borough 3, Block 2016, Lot 61) · BIN 3057724 · Last updated:

Summary · as of October 31, 2026

189 Lefferts Place (Brooklyn, NY 11238; tax lot BBL 3020160061) is a 3-unit walk-up apartment building (building class C0: three-family walk-up), built around 1930, on a 1,969 sq ft lot zoned R6B. City tax records list the owner as PERENNIAL REAL ESTATE GROUP INC; the most recent deed with a stated price is dated August 13, 2021 at $2,495,000 (per ACRIS). The Department of Finance's final market value for tax year 2027 is $1,454,000. As of October 31, 2026, NYC Open Data shows 18 active DOB violations, one active ECB violation, 44 open HPD violations and three OATH tickets with an unpaid balance. (Source: NYC Open Data — DOB, HPD, OATH, DOF, DCP and ACRIS datasets — compiled by NYC Property Facts.)

Owner of record
PERENNIAL REAL ESTATE GROUP INC
Building class
C0 · Three-family walk-up
Year built · units
1930 · 3 res.
Lot area · zoning
1,969 sq ft · R6B
Market value (DOF)
$1,454,000 FY2027
Last priced deed
$2,495,000 · 2021-08-13
BBL
3020160061
BIN
3057724

How to cite: NYC Property Facts, “189 Lefferts Place, Brooklyn, NY 11238 (BBL 3020160061)”, data as of 2026-10-31, https://nycpropertyfacts.com/ny/brooklyn/189-lefferts-place-3020160061. 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)
PERENNIAL REAL ESTATE GROUP INCThe 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
1930Often an estimate for older buildings.
Floors
4
Units
3 residential / 3 totalResidential units are apartments; total includes stores and offices.
Buildings on lot
1
Lot size
1,969 sq ft (15.75 ft × 125 ft)
Building floor area
3,544 sq ft
Zoning
R6BThe zoning district sets what can be built and used here. Residential district.
Built vs. allowed density (FAR)
1.80 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 3020160061 (Borough 3, Block 2016, Lot 61) · BIN 3057724BBL 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; data as of 2026-11-01; 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)
$1,454,000The 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
$87,240The portion of market value that taxes are calculated on (capped by law for small homes).
Taxable value (final)
$38,375Assessed value minus any exemptions.
Tax class
Tax class 1 – 1–3 family homes (and some small mixed-use / vacant lots)
Tax yearRollMarket valueAssessed valueTax class
2027Final$1,454,000$87,2401
2026Final$1,372,000$82,3201
2025Final$1,312,000$78,7201

Source: DOF Property Valuation and Assessment Data — city dataset updated 2026-09-14; data as of 2026-11-01

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.

DateTypePriceSeller (grantor)Buyer (grantee)Doc ID
2021-08-30DEED$0 / not statedJones, Jason ByronPerennial Real Estate Group Inc2021101100215001
2021-08-13DEED$2,495,000Reign Phoenix 3, IncJones, Jason Byron2021081701000002
2019-07-02DEED$0 / not statedFrazer, FedericoReign Phoenix 3, Inc2019070201321001
2002-04-03DEED$715,000189 Lefferts Place Corp.Frazer, Federico2004032401527002
1968-07-29DEED$0 / not statedCorbin Coleridge E189 Lefferts Pl CorpBK_6830078300303

Source: ACRIS Real Property Master — city dataset updated 2026-10-08; data as of 2026-11-01; ACRIS Real Property Legals — city dataset updated 2026-10-08; data as of 2026-11-01; ACRIS Real Property Parties — city dataset updated 2026-10-08; data as of 2026-11-01

DOB job filings 0 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
Not open
SIGNED OFF · 2018-10-29
340537191
BIS
A3 – Minor alteration (one type of work)2017-08-23—

Source: DOB NOW: Build – Job Application Filings — city dataset updated 2026-10-31; data as of 2026-11-01; DOB Job Application Filings (BIS) — city dataset updated 2026-10-30; data as of 2026-10-31

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
2017-09-112018-09-11340537191
BIS
Construction equipment (scaffold, fence, shed) / Construction equipmentISSUED (initial)

Source: DOB NOW: Build – Approved Permits — city dataset updated 2026-10-31; data as of 2026-11-01; DOB Permit Issuance (BIS) — city dataset updated 2026-10-31; data as of 2026-10-31

DOB violations 18 active of 18

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).

StatusIssuedTypeDescriptionNumber
Active
V-DOB VIOLATION - ACTIVE
2025-11-14LBLVIO-LOW PRESSURE BOILER BOILER REQUIREDVIOLATION ISSUED-FAILURE TO FILE 2024 EXTERNAL LOW PRESSURE INSPECTIONV111425LBLVIO10417
Active
V-DOB VIOLATION - ACTIVE
2024-09-23LBLVIO-LOW PRESSURE BOILER BOILER REQUIREDVIOLATION ISSUED-FAILURE TO FILE 2023 EXTERNAL LOW PRESSURE INSPECTIONV092324LBLVIO09355
Active
V-DOB VIOLATION - ACTIVE
2023-06-30LBLVIO-LOW PRESSURE BOILER BOILER REQUIREDVIOLATION ISSUED-FAILURE TO FILE 2020 EXTERNAL LOW PRESSURE INSPECTIONV063023LBLVIO17763
Active
V-DOB VIOLATION - ACTIVE
2023-06-30LBLVIO-LOW PRESSURE BOILER BOILER REQUIREDVIOLATION ISSUED-FAILURE TO FILE 2021 EXTERNAL LOW PRESSURE INSPECTIONV063023LBLVIO37872
Active
V-DOB VIOLATION - ACTIVE
2023-06-20LBLVIO-LOW PRESSURE BOILER BOILER REQUIREDVIOLATION ISSUED-FAILURE TO FILE 2018 EXTERNAL LOW PRESSURE INSPECTIONV062023LBLVIO19421
Active
V-DOB VIOLATION - ACTIVE
2023-06-20LBLVIO-LOW PRESSURE BOILER BOILER REQUIREDVIOLATION ISSUED-FAILURE TO FILE 2019 EXTERNAL LOW PRESSURE INSPECTIONV062023LBLVIO39392
Active
V-DOB VIOLATION - ACTIVE
2023-04-25LBLVIO-LOW PRESSURE BOILER BOILER REQUIREDVIOLATION ISSUED-FAILURE TO FILE 2022 EXTERNAL LOW PRESSURE INSPECTIONV042523LBLVIO19363
Active
V-DOB VIOLATION - ACTIVE
2019-11-08LBLVIO-LOW PRESSURE BOILER BOILER REQUIREDVIOLATION ISSUED FOR FAILURE TO FILE ANNUAL BOILER 2017 INSPECTION REPORTV110819LBLVIO11997
Active
V-DOB VIOLATION - ACTIVE
2018-04-06LBLVIO-LOW PRESSURE BOILER BOILER REQUIREDVIOLATION ISSUED FOR FAILURE TO FILE ANNUAL BOILER 2016 INSPECTION REPORTV040618LBLVIO14598
Active
V-DOB VIOLATION - ACTIVE
2017-04-03C-CONSTRUCTION OTHER OPTIONALDUE TO FIREV040317CCER01DL
Active
V-DOB VIOLATION - ACTIVE
2017-02-24LBLVIO-LOW PRESSURE BOILER BOILER REQUIREDVIOLATION ISSUED FOR FAILURE TO FILE ANNUAL BOILER 2015 INSPECTION REPORTV022417LBLVIO12139
Active
V-DOB VIOLATION - ACTIVE
2015-10-01LBLVIO-LOW PRESSURE BOILER BOILER REQUIREDVIOLATION ISSUED FOR FAILURE TO FILE ANNUAL BOILER 2014 INSPECTION REPORTV100115LBLVIO11125
Active
V-DOB VIOLATION - ACTIVE
2015-03-03LBLVIO-LOW PRESSURE BOILER BOILER REQUIREDVIOLATION ISSUED FOR FAILURE TO FILE ANNUAL BOILER 2013 INSPECTION REPORTV030315LBLVIO11015
Active
V-DOB VIOLATION - ACTIVE
2004-02-13LL6291-LOCAL LAW 62/91 - BOILERS BOILER REQUIREDV021304LL629122147
Active
V-DOB VIOLATION - ACTIVE
2003-03-19LL6291-LOCAL LAW 62/91 - BOILERS BOILER REQUIREDV031903LL629116925

Showing 15 of 18 records. The API and the source dataset have the full list.

Source: DOB Violations — city dataset updated 2026-10-31; data as of 2026-11-01

ECB violations (DOB) 1 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.

StatusIssuedSeverityWhat it was forPenalty / paid / balanceECB #
Active
Hearing: WRITTEN OFF
Written off refers to the penalty, not the violation.
2018-01-19CLASS - 2AS PER CLASS 2(B265)28-303.7 FAILURE TO FILE A COMPLETE BOILER INSPECTION REPORT AS PER DOB RECORDS SUBMIT AN INITIAL INSPECTION REPORT.$2,500 / $0 / $032092858K

Source: DOB ECB Violations — city dataset updated 2026-10-31; data as of 2026-11-01

OATH tickets (all agencies) 3 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.

StatusDateAgencyChargeRespondentImposed / paid / balanceTicket #
Unpaid balance Default
DOCKETED · DEFAULTED
2026-02-01Sanitation OthersLOOSE RUBBISH 1ST OCCURRENCEPERENNIAL REAL ESTATE GROUP IN$300 / $0 / $300049580949X
Unpaid balance Default
DEFAULTED · DEFAULTED
2024-08-23Pcs - DohmhFAIL TO ELIMINATE RODENT INFESTATION SHOWN BY ACTIVE RODENT SIGNS 1STC O MGMT$600 / $0 / $6000803164598
Unpaid balance Default
DEFAULTED · DEFAULTED
2023-12-27Pcs - DohmhFAIL TO ELIMINATE RODENT INFESTATION SHOWN BY ACTIVE RODENT SIGNS 1STPERENNIAL REAL ESTATE GROUP IN$600 / $0 / $6000802908426
No balance due
PAID IN FULL · IN VIOLATION
2020-11-13Pcs - DohmhFAIL TO ELIMINATE RODENT INFESTATION SHOWN BY ACTIVE RODENT SIGNS 1ST3 INC$300 / $300 / $00801913200
No balance due
WRITTEN OFF · WRITTEN OFF
2018-01-19Dept. Of BuildingsFAILURE TO FILE COMPLETE BOILER INSPECTION REPORTFEDERICO FRAZER$2,500 / $0 / $0032092858K
No balance due Default
PAID IN FULL · DEFAULTED
2017-11-20Pcs - DohmhFAIL TO ELIMINATE RODENT INFESTATION SHOWN BY ACTIVE RODENT SIGNS 1STFRAZER$600 / $600 / $00801213041
No balance due
PAID IN FULL · SETTL IN-VIO
2017-03-11Sanitation OthersLOOSE RUBBISHFARLOV$300 / $100 / $00194719847
No balance due Default
PAID IN FULL · DEFAULTED
2014-05-09Vector - DohmhFAIL TO ELIMINATE STANDING WATER MOSQUITO CONDITIONS;MINORFEDERICO$600 / $600 / $00800497776
No balance due Default
PAID IN FULL · DEFAULT
2001-07-24$25 / $125 / $-1000117164071

Source: OATH Hearings Division Case Status — city dataset updated 2026-11-01; data as of 2026-11-01

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.

HPD building ID
323740
Last registered
2002-04-05
Registration valid until
2003-03-31 ExpiredRegistrations must be renewed every year.
RoleNameCompanyBusiness city
AgentWayne ScantleburyBrooklyn, Ny
OfficerColeridge CorbinBrooklyn, Ny
SitemanagerWayne Scantlebury
HeadofficerCorbinBklyn, Ny
CorporateownerCOLERIDGE CORBINBrooklyn, Ny

Source: HPD Multiple Dwelling Registrations — city dataset updated 2026-10-28; data as of 2026-11-01; HPD Registration Contacts — city dataset updated 2026-10-28; data as of 2026-11-01

HPD housing-code violations 44 open of 45

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.

StatusClassIssuedAptCondition
Open
Nov Sent Out · 2026-05-05
A2026-05-05(A) § HMC:FILE ANNUAL BEDBUG REPORT IN ACCORDANCE WITH HPD RULE AS DESCRIBED ON THE BACK OF THIS NOTICE OF VIOLATION OR AS DESCRIBED ON HPDS WEBSITE, WWW.NYC.GOV\HPD, SEARCH BED BUGS.
Open
Info Nov Sent Out · 2025-11-20
I2025-11-20§27-2107 ADM CODE OWNER FAILED TO FILE A VALID REGISTRATION STATEMENT WITH THE DEPARTMENT AS REQUIRED BY ADM CODE §27-2097 AND IS THEREFORE SUBJECT TO CIVIL PENALTIES, PROHIBITED FROM CERTIFYING VIOLATIONS, AND DENIED THE RIGHT TO RECOVER POSSESSION OF PREMISE
Open
Nov Sent Out · 2025-06-10
A2025-06-10(A) § HMC:FILE ANNUAL BEDBUG REPORT IN ACCORDANCE WITH HPD RULE AS DESCRIBED ON THE BACK OF THIS NOTICE OF VIOLATION OR AS DESCRIBED ON HPDS WEBSITE, WWW.NYC.GOV\HPD, SEARCH BED BUGS.
Open
Info Nov Sent Out · 2024-11-29
I2024-11-29§27-2107 ADM CODE OWNER FAILED TO FILE A VALID REGISTRATION STATEMENT WITH THE DEPARTMENT AS REQUIRED BY ADM CODE §27-2097 AND IS THEREFORE SUBJECT TO CIVIL PENALTIES, PROHIBITED FROM CERTIFYING VIOLATIONS, AND DENIED THE RIGHT TO RECOVER POSSESSION OF PREMISE
Open
Nov Sent Out · 2024-04-10
A2024-04-10(A) § HMC:FILE ANNUAL BEDBUG REPORT IN ACCORDANCE WITH HPD RULE AS DESCRIBED ON THE BACK OF THIS NOTICE OF VIOLATION OR AS DESCRIBED ON HPDS WEBSITE, WWW.NYC.GOV\HPD, SEARCH BED BUGS.
Open
Info Nov Sent Out · 2023-11-22
I2023-11-22§27-2107 ADM CODE OWNER FAILED TO FILE A VALID REGISTRATION STATEMENT WITH THE DEPARTMENT AS REQUIRED BY ADM CODE §27-2097 AND IS THEREFORE SUBJECT TO CIVIL PENALTIES, PROHIBITED FROM CERTIFYING VIOLATIONS, AND DENIED THE RIGHT TO RECOVER POSSESSION OF PREMISE
Open
Nov Sent Out · 2023-03-23
A2023-03-23(A) § HMC:FILE ANNUAL BEDBUG REPORT IN ACCORDANCE WITH HPD RULE AS DESCRIBED ON THE BACK OF THIS NOTICE OF VIOLATION OR AS DESCRIBED ON HPDS WEBSITE, WWW.NYC.GOV\HPD, SEARCH BED BUGS.
Open
Info Nov Sent Out · 2022-11-14
I2022-11-14§27-2107 ADM CODE OWNER FAILED TO FILE A VALID REGISTRATION STATEMENT WITH THE DEPARTMENT AS REQUIRED BY ADM CODE §27-2097 AND IS THEREFORE SUBJECT TO CIVIL PENALTIES, PROHIBITED FROM CERTIFYING VIOLATIONS, AND DENIED THE RIGHT TO RECOVER POSSESSION OF PREMISE
Open
Nov Sent Out · 2022-02-25
A2022-02-25(A) § HMC:FILE ANNUAL BEDBUG REPORT IN ACCORDANCE WITH HPD RULE AS DESCRIBED ON THE BACK OF THIS NOTICE OF VIOLATION OR AS DESCRIBED ON HPDS WEBSITE, WWW.NYC.GOV\HPD, SEARCH BED BUGS.
Open
Info Nov Sent Out · 2022-02-25
I2022-02-25§27-2107 ADM CODE OWNER FAILED TO FILE A VALID REGISTRATION STATEMENT WITH THE DEPARTMENT AS REQUIRED BY ADM CODE §27-2097 AND IS THEREFORE SUBJECT TO CIVIL PENALTIES, PROHIBITED FROM CERTIFYING VIOLATIONS, AND DENIED THE RIGHT TO RECOVER POSSESSION OF PREMISE
Open
Info Nov Sent Out · 2021-04-09
I2021-04-09§27-2107 ADM CODE OWNER FAILED TO FILE A VALID REGISTRATION STATEMENT WITH THE DEPARTMENT AS REQUIRED BY ADM CODE §27-2097 AND IS THEREFORE SUBJECT TO CIVIL PENALTIES, PROHIBITED FROM CERTIFYING VIOLATIONS, AND DENIED THE RIGHT TO RECOVER POSSESSION OF PREMISE
Open
Nov Sent Out · 2021-04-09
A2021-04-09(A) § HMC:FILE ANNUAL BEDBUG REPORT IN ACCORDANCE WITH HPD RULE AS DESCRIBED ON THE BACK OF THIS NOTICE OF VIOLATION OR AS DESCRIBED ON HPDS WEBSITE, WWW.NYC.GOV\HPD, SEARCH BED BUGS.
Open
Info Nov Sent Out · 2019-10-30
I2019-10-30§27-2107 ADM CODE OWNER FAILED TO FILE A VALID REGISTRATION STATEMENT WITH THE DEPARTMENT AS REQUIRED BY ADM CODE §27-2097 AND IS THEREFORE SUBJECT TO CIVIL PENALTIES, PROHIBITED FROM CERTIFYING VIOLATIONS, AND DENIED THE RIGHT TO RECOVER POSSESSION OF PREMISE
Open
Info Nov Sent Out · 2018-10-18
I2018-10-18§27-2107 ADM CODE OWNER FAILED TO FILE A VALID REGISTRATION STATEMENT WITH THE DEPARTMENT AS REQUIRED BY ADM CODE §27-2097 AND IS THEREFORE SUBJECT TO CIVIL PENALTIES, PROHIBITED FROM CERTIFYING VIOLATIONS, AND DENIED THE RIGHT TO RECOVER POSSESSION OF PREMISE
Open
Info Nov Sent Out · 2017-11-27
I2017-11-27§27-2107 ADM CODE OWNER FAILED TO FILE A VALID REGISTRATION STATEMENT WITH THE DEPARTMENT AS REQUIRED BY ADM CODE §27-2097 AND IS THEREFORE SUBJECT TO CIVIL PENALTIES, PROHIBITED FROM CERTIFYING VIOLATIONS, AND DENIED THE RIGHT TO RECOVER POSSESSION OF PREMISE
Open
Info Nov Sent Out · 2016-11-10
I2016-11-10SECTION27-2107 ADM CODE OWNER FAILED TO FILE A VALID REGISTRATION STATEMENT WITH THE DEPARTMENT AS REQUIRED BY ADM CODE ?27-2097 AND IS THEREFORE SUBJECT TO CIVIL PENALTIES, PROHIBITED FROM CERTIFYING VIOLATIONS, AND DENIED THE RIGHT TO RECOVER POSSESSION OF P
Open
Info Nov Sent Out · 2015-10-09
I2015-10-09SECTION27-2107 ADM CODE OWNER FAILED TO FILE A VALID REGISTRATION STATEMENT WITH THE DEPARTMENT AS REQUIRED BY ADM CODE ?27-2097 AND IS THEREFORE SUBJECT TO CIVIL PENALTIES, PROHIBITED FROM CERTIFYING VIOLATIONS, AND DENIED THE RIGHT TO RECOVER POSSESSION OF P
Open
Info Nov Sent Out · 2015-02-23
I2015-02-23SECTION27-2107 ADM CODE OWNER FAILED TO FILE A VALID REGISTRATION STATEMENT WITH THE DEPARTMENT AS REQUIRED BY ADM CODE ?27-2097 AND IS THEREFORE SUBJECT TO CIVIL PENALTIES, PROHIBITED FROM CERTIFYING VIOLATIONS, AND DENIED THE RIGHT TO RECOVER POSSESSION OF P
Open
Nov Sent Out · 2008-06-10
A2008-06-10D26-10.01 ADM CODE PROPERLY REPAIR THE BROKEN OR DEFECTIVE WOOD CORNICE WALL AT 1ST STY FRONT OF BLDG.
Open
Nov Sent Out · 2008-06-10
A2008-06-10D26-31.09 ADM CODE PROVIDE UNDER COMPLETED PERMIT SANITARY FACILITIES FOR EACH 6 PERSONS OR REMAINDER THEREOF FOR CLASS B ROOMS BY INSTALLING 2 BATHTUBS OR SHOWERS 2 WASH BASINS.

Showing 20 of 45 records — open violations are listed first; the API lists every one. The API and the source dataset have the full list.

Source: HPD Housing Maintenance Code Violations — city dataset updated 2026-10-31; data as of 2026-11-01

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 2026-11-01; data as of 2026-11-01

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 2026-11-01; data as of 2026-11-01

Nearby properties

On Lefferts Pl

Same tax block (2016)

All properties on Lefferts Pl, Brooklyn · All of Brooklyn 11238 (Prospect Heights)

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