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50 Pine Street, East New York-City Line, Brooklyn, NY 11208

BBL 3041170042 (Borough 3, Block 4117, Lot 42) · BIN 3091634 · Last updated: · East New York-City Line · ZIP 11208

Summary · as of November 10, 2026

50 Pine Street (Brooklyn, NY 11208; tax lot BBL 3041170042) is a two-family home (building class B1: two-family home, brick), built around 1901, on a 2,000 sq ft lot zoned R5. City tax records list the owner as XIU MEI TIAN; the most recent deed with a stated price is dated November 12, 2019 at $134,000 (per ACRIS). The Department of Finance's final market value for tax year 2027 is $935,000. As of November 10, 2026, NYC Open Data shows 14 open HPD violations and three OATH tickets with an unpaid balance. There were 12 311 requests 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
XIU MEI TIAN
Building class
B1 · Two-family home, brick
Year built · units
1901 · 2 res.
Lot area · zoning
2,000 sq ft · R5
Market value (DOF)
$935,000 FY2027
Last priced deed
$134,000 · 2019-11-12
BBL
3041170042
BIN
3091634

How to cite: NYC Property Facts, “50 Pine Street, Brooklyn, NY 11208 (BBL 3041170042)”, data as of 2026-11-10, https://nycpropertyfacts.com/ny/brooklyn/50-pine-street-3041170042. 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)
XIU MEI TIANThe 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
1901Often an estimate for older buildings. Major alteration recorded: 2012.
Floors
2
Units
2 residential / 2 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
2,048 sq ft
Zoning
R5The zoning district sets what can be built and used here. Residential district.
Built vs. allowed density (FAR)
1.02 built / 1.50 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 3041170042 (Borough 3, Block 4117, Lot 42) · BIN 3091634BBL 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 2026-11-10; 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)
$935,000The 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
$56,100The portion of market value that taxes are calculated on (capped by law for small homes).
Taxable value (final)
$36,644Assessed 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$935,000$56,1001
2026Final$815,000$48,9001
2025Final$803,000$48,1801

Source: DOF Property Valuation and Assessment Data — city dataset updated 2026-09-14; last loaded 2026-11-10

Sales & deed history 10

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
2019-11-12DEED$134,000Hei, Cheung ChungTian, Xiu Mei2019111900736001
2019-11-12DEED$616,000Richard Alan Klass, Esq., As RefereeChung Hei, Cheung2019111900580001
2013-08-30DEED$518,000Guzman, Nelfa ABh Reliable Realty Inc.2013090900202001
2007-10-12DEED$635,000Perez, Ramon AGuzman, Nelfa A2007103001210001
2007-10-11DEED$640,000Perez, RamonGuzman, Nelfa2007101701733002
2006-02-03DEED$580,000Herrera, Rafael APerez, Ramon A2006030301590001
2005-05-06DEED$480,000De Los Santos, EvelisseHerrera, Rafael A2005051700341001
2004-11-19DEED$420,000Burgess, WillieDelossantos, Evelisse2004120201006002
1994-06-07DEED$0 / not statedRamirez, Miryan; Ramirez, JoseBurgess, Willi E; Burgess, ThelmaFT_3980004328598
1979-09-12DEED$0 / not statedLong Gerard E; Long KathrynRamirez Miryam; Ramirez JoseBK_7930110001909

Source: ACRIS Real Property Master — city dataset updated 2026-10-08; last loaded 2026-11-10; ACRIS Real Property Legals — city dataset updated 2026-10-08; last loaded 2026-11-10; ACRIS Real Property Parties — city dataset updated 2026-10-08; last loaded 2026-11-10

DOB job filings 0 open of 3

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
LOC Issued · 2021-06-17
B00406899-I1
DOB NOW
Alteration2021-02-03$5,000
Not open
SIGNED OFF · 2021-07-09
340783575
BIS
A2 – Alteration with multiple work types (no change to use/occupancy)2020-11-05$190,075
Not open
APPLICATION PROCESSED - ENTIRE · 2020-11-04
340783398
BIS
A2 – Alteration with multiple work types (no change to use/occupancy)2020-11-04$35,000

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

Work permits 2

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
2021-05-052022-04-12340783575
BIS
Equipment work / Other / general constructionISSUED (initial)
2021-04-202021-12-22B00406899-I1
DOB NOW
Plumbing
CAP & REMOVE ILLEGAL KITCHEN, SINK& LEGALIZE 1 WC,1 LAV, 1 SHOWER IN THE BASMENT, CONSTRUCTION FILED UNDER SEPARATED APPLICATION#-340783575 TO DISMISS VIO#345
Signed-off

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

No records found in this dataset for this lot.

Source: DOB Violations — city dataset updated 2026-11-09; last loaded 2026-11-10

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 2026-11-09; last loaded 2026-11-10

ECB violations (DOB) 0 active of 4

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 #
Resolved
Hearing: WRITTEN OFF · Certification: CERTIFICATE ACCEPTED
Written off refers to the penalty, not the violation.
2007-01-02HazardousRESIDENCE ALTERED FOR OCCUPANCY AS A DWELLING FOR MORE THAN THE LEGALLY APPROVED # OF FAM. NOTED: DOB RECORDS INDICATE RESIDENCE LEGALLY APPROVED FOR 2 FAM. RESIDENCE IS NOW ALTERED FOR OCCUPANCY BY 5 FAM W/$7,550 / $5,096 / $034555562M
Resolved
Hearing: WRITTEN OFF · Certification: CERTIFICATE ACCEPTED
Written off refers to the penalty, not the violation.
2006-12-17HazardousOCCUPANCY CONTRARY TO THAT ALLOWED BY C OF O & DOB RECORDS. CLASS A APT CREATED AT CELLAR 1 STY SUBDIVIDED INTO 2 PARTS. REMEDY: RESTORE PREMISES TO LEGAL OCCUPANCY.$800 / $0 / $034519796R
Resolved
Hearing: WRITTEN OFF · Certification: CERTIFICATE ACCEPTED
Written off refers to the penalty, not the violation.
2007-01-02HazardousWORK W/O A PERMIT. WORK NOTED: PARTITIONS ERECTED AT B'MENT CREATING RMS. PLUMBING LINES RUN FOR KITCHEN SINK/ GAS STOVE & 3PC BATHRM. PARTITIONS ERECTED AT 1ST/ 2ND FLS SUBDIVIDING EACH FL INTO 4- 1 BEDRM UNIT$800 / $0 / $034555561K
Resolved
Hearing: WRITTEN OFF · Certification: CERTIFICATE ACCEPTED
Written off refers to the penalty, not the violation.
2007-05-31Non-HazardousFAILURE TO COMPLY WITH AN ORDER OF THE COMMISSIONER TO CORRECT THE VIOLATING CONDITION ECB #3455561K IN THAT PARTITIONS HAVE BEEN ERECTED INTHE BASEMENT CREATING ROOMS,ALONG W/ THE RUNNING OF PLUMBING LINES FOR$1,500 / $0 / $034576590M

Source: DOB ECB Violations — city dataset updated 2026-11-07; last loaded 2026-11-10

OATH tickets (all agencies) 3 unpaid of 14

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
DEFAULTED · DEFAULTED
2026-06-16Sanitation OthersFAIL TO RECYCLE ORGANIC WASTE 1-8 DWELLING UNITS 1STXIU MEI TIAN$25 / $0 / $25049910065J
Unpaid balance Default
DOCKETED · DEFAULTED
2024-10-07Sanitation OthersSTORAGE OF RECEPTACLES PLACED OUT PRIOR TO 8PM WITHOUT A RECEPTACLECHUNG HEI CHEUNG$300 / $0 / $300048625008Y
Unpaid balance Default
DOCKETED · DEFAULTED
2019-11-12Dos - Enforcement AgentsIMPROPER MISUSED CURBSIDE RECYCLING CONTAINER 1 TO 8 DWELLING UNITSBH RELIABLE REALTY INC$25 / $0 / $25045143537Z
No balance due
WRITTEN OFF · WRITTEN OFF
2017-01-24Dos - Enforcement AgentsRECYC PLACED FOR COLLECTION W NON-RECYC 1 TO 8 DWELLING UNITSBH RELIABLE REALTY INC$25 / $0 / $0041576046M
No balance due
HEARING COMPLETED · DISMISSED
2014-12-23LOOSE RUBBISHDUNKIN DONUTS— / — / —0183045491
No balance due
WRITTEN OFF · WRITTEN OFF
2014-12-11Dos - Enforcement AgentsSTORAGE OF RECEPTACLESBH RELIABLE REALTY INC$300 / $0 / $0042037386M
No balance due
WRITTEN OFF · WRITTEN OFF
2014-09-29Sanitation OthersDIRTY AREABH RELIABLE REALTY INC$300 / $0 / $00182981875
No balance due
WRITTEN OFF · WRITTEN OFF
2014-09-16Sanitation OthersDIRTY AREABH RELIABLE REALTY INC$300 / $0 / $00182988924
No balance due
WRITTEN OFF · WRITTEN OFF
2013-11-06Dos - Enforcement AgentsNON-RECYC LEFT IN RECYC CONTAINER FOR COLLECTION 1TO8 DWELLING UNITSBH RELIABLE REALTY INC$25 / $0 / $0041616459Y
No balance due
WRITTEN OFF · WRITTEN OFF
2007-05-31Dept. Of BuildingsFAILURE TO COMPLY WITH AN ORDER OF THE DEPARTMENTPEREZ$1,500 / $0 / $0034576590M
No balance due
WRITTEN OFF · WRITTEN OFF
2007-01-02Dept. Of BuildingsRESID. ALTERED MANT D FOR MORE THAN LEGALLY APPROVED NO., OF FAMILIES.PEREZ$7,550 / $5,096 / $0034555562M
No balance due
WRITTEN OFF · WRITTEN OFF
2007-01-02Dept. Of BuildingsWORK WITHOUT A PERMIT: HAZARDOUS.PEREZ$800 / $0 / $0034555561K

Showing 12 of 14 records. The API and the source dataset have the full list.

Source: OATH Hearings Division Case Status — city dataset updated 2026-11-10; last loaded 2026-11-10

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
353608
Last registered
2023-09-19
Registration valid until
2024-09-30 ExpiredRegistrations must be renewed every year.
RoleNameCompanyBusiness city
IndividualownerXiumei TianBrooklyn, Ny
SitemanagerJonathan Chu

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 14 open of 19

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
Info Nov Sent Out · 2025-11-24
I2025-11-24§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 · 2024-12-03
I2024-12-03§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 · 2011-09-23
B2011-09-232SECTION 27-2005 ADMIN. CODE: PROPERLY REPAIR WITH SIMILAR MATERIAL THE BROKEN OR DEFECTIVE CERAMIC TILES AT THE EAST WALL IN THE KITCHEN LOCATED AT APT 2, 2nd STORY
Open
Nov Sent Out · 2011-09-23
B2011-09-232SECTION 27-2005 ADMIN. CODE: PROPERLY REPAIR WITH SIMILAR MATERIAL THE BROKEN OR DEFECTIVE CERAMIC FLOOR TILES IN THE ENTIRE APARTMENT LOCATED AT APT 2, 2nd STORY
Open
Nov Sent Out · 1993-08-06
B2008-09-24SECTION 27-2073 ADM CODE - DISCONTINUE UNLAWFUL COOKING SPACE OR FILE PLANS AND APPLICATION WITH THIS DEPARTMENT TO LEGALIZE SAME, IF LAWFULLY FEASIBLE KITCHEN AT CELLAR
Open
Nov Sent Out · 1993-08-06
B2008-09-24SECTION 27-2087 ADM CODE - DISCONTINUE USE OF ROOMS FOR LIVING, DISCONNECT PLUMBING FIXTURES WHERE ILLEGAL AND PROPERLY SEAL PIPE CONNECTIONS AT CELLAR THROUGHOUT LEGAL FIXTURES MAY BE RETAINED; FOR INFORMAION CALL THE BOROUGH CODE EONFORCEMENT OFFICE
Open
Nov Sent Out · 2006-12-26
B2006-12-26SECTION 27-2073 ADM CODE - DISCONTINUE UNLAWFUL COOKING SPACE OR FILE PLANS AND APPLICATION WITH THIS DEPARTMENT TO LEGALIZE SAME, IF LAWFULLY FEASIBLE ........ AT CELLAR
Open
Nov Sent Out · 2006-12-26
B2006-12-26SECTION 9, 170, 171, 300, 301, 302 M.D.LAW-FILE PLANS AND APPLICATION AND OBTAIN A CERTIFICATE OF OCCUPANCY TO LEGALIZE THE CONVERSION FROM A PRIVATE DWELLING TO MULTIPLE DWELLING USE IF LAWFULLY FEASIBLE OR RESTORE TO LAWFUL OCCUPANCY
Open
Nov Sent Out · 2006-12-26
B2006-12-26SECTION 27-2087 ADM CODE - DISCONTINUE USE OF ROOMS FOR LIVING, DISCONNECT PLUMBING FIXTURES WHERE ILLEGAL AND PROPERLY SEAL PIPE CONNECTIONS ........ AT CELLAR
Open
Nov Sent Out · 2006-12-19
B2006-12-191SECTION 27-2005 ADMIN. CODE: PROPERLY REPAIR WITH SIMILAR MATERIAL THE BROKEN OR DEFECTIVE DOOR TO REAR YARD IN THE KITCHEN LOCATED AT APT 1, 1st STORY
Open
Nov Sent Out · 2006-11-30
B2006-11-30SECTION 27-2005 ADMIN. CODE: ABATE THE NUISANCE CONSISTING OF PARTITION ERECTED CREATING ROOM. AT CELLAR
Open
Nov Sent Out · 2005-01-11
B2005-01-11BSMTSECTION 27-2046.1, 2046.2 HMC: PROVIDE AN APPROVED AND OPERATIONAL CARBON MONOXIDE DETECTING DEVICE, INSTALLED IN ACCORDANCE WITH APPLICABLE LAW AND RULES. IN THE ENTIRE APARTMENT LOCATED AT APT BSMT
Open
Nov Sent Out · 2005-01-11
B2005-01-11BSMTSECTION 27-2044 ADM CODE - REPAIR OR REPLACE SMOKE DETECTOR MISSING IN THE ENTIRE APARTMENT LOCATED AT APT BSMT
Open
Nov Sent Out · 2005-01-11
C2005-01-11BSMTSECTION 27-2005 ADMIN. CODE: ABATE THE NUISANCE CONSISTING OF SCALDING HOT WATER IN THE ENTIRE APARTMENT LOCATED AT APT BSMT
Closed
Violation Dismissed · 2023-09-20
I2022-11-17§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
Closed
Violation Dismissed · 2023-09-20
I2022-03-16§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
Closed
Violation Dismissed · 2023-09-20
I2021-04-21§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
Closed
Violation Dismissed · 2023-09-20
I2019-11-07§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
Closed
Violation Dismissed · 2023-09-20
I2018-01-08§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

Source: HPD Housing Maintenance Code Violations — city dataset updated 2026-11-10; last loaded 2026-11-10

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 2026-11-10; last loaded 2026-11-10

311 requests (last 12 months) 12

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
2026-08-16NYPDNoise - Residential – Loud Music/PartyClosed2026-08-16
2026-07-26NYPDNoise - Residential – Loud Music/PartyClosed2026-07-27
2026-07-26NYPDNoise - Residential – Loud Music/PartyClosed2026-07-26
2026-07-26NYPDNoise - Residential – Loud Music/PartyClosed2026-07-26
2026-07-26NYPDNoise - Residential – Loud Music/PartyClosed2026-07-26
2026-07-26NYPDNoise - Residential – Loud Music/PartyClosed2026-07-26
2026-05-31NYPDNoise - Residential – Loud Music/PartyClosed2026-05-31
2026-05-31NYPDNoise - Residential – Loud Music/PartyClosed2026-05-31
2026-05-31NYPDNoise - Residential – Loud Music/PartyClosed2026-05-31
2026-05-31NYPDNoise - Residential – Loud Music/PartyClosed2026-05-31

Showing 10 of 12 records. The API and the source dataset have the full list.

Source: 311 Service Requests from 2020 to Present — city dataset updated 2026-11-10; last loaded 2026-11-10

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 East New York-City Line: Open HPD violations · Active DOB violations · Active ECB violations · Open DOB jobs · Unpaid OATH tickets

Closest on Pine St

Same tax block (4117), closest first

All properties on Pine St, Brooklyn · Brooklyn 11208

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