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Nassau Boulevard, Queens, NY 11430

BBL 4119000002 (Borough 4, Block 11900, Lot 2) · BIN 4594718, 4594716, 4459552, 4594714, 4594719, 4594731, 4459553, 4459546, 4594728, 4459547, 4594730, 4594721, 4594707, 4594727, 4594735, 4594710, 4594723, 4594712, 4594708, 4594724, 4594734, 4594720, 4617518, 4594706, 4459549, 4594709, 4594711, 4594713, 4594717, 4594732, 4459550, 4594726, 4594704, 4594705, 4594722, 4459551, 4155493 · Last updated:

Also recorded in city data as: 150-20 134 St · 150-24 134 St · 150-00 134 St · 15020 134 St

Summary · as of October 31, 2026

Nassau Boulevard (Queens, NY 11430; tax lot BBL 4119000002) is an utility property (building class U9: utility property (subtype U9)), on a 1,306,085 sq ft lot zoned M2-1. City tax records list the owner as NYC DEPARTMENT OF ENVIRONMENTAL PROTECTION. As of October 31, 2026, NYC Open Data shows 20 DOB jobs with a permit issued but no sign-off, 17 active DOB violations and three OATH tickets with an unpaid balance. There were 17 311 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
NYC DEPARTMENT OF ENVIRONMENTAL PROTECTION
Building class
U9 · Utility property
Year built · units
— · 0 res.
Lot area · zoning
1,306,085 sq ft · M2-1
Market value (DOF)
$0 FY2027
Last priced deed
—
BBL
4119000002
BIN
4594718, 4594716, 4459552 …

How to cite: NYC Property Facts, “Nassau Boulevard, Queens, NY 11430 (BBL 4119000002)”, data as of 2026-10-31, https://nycpropertyfacts.com/ny/queens/nassau-boulevard-4119000002. 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)
NYC DEPARTMENT OF ENVIRONMENTAL PROTECTIONThe owner name on the city’s tax records. It can lag behind recent sales and is often an LLC.
Building class
U9 – Utility property (subtype U9)The Department of Finance’s category for what kind of building this is.
Land use
Transportation & utilityCity Planning’s broad category of how the lot is used.
Year built
—Often an estimate for older buildings.
Floors
—
Units
0 residential / 0 totalResidential units are apartments; total includes stores and offices.
Buildings on lot
36
Lot size
1,306,085 sq ft (490 ft × 250 ft)
Building floor area
0 sq ft
Zoning
M2-1The zoning district sets what can be built and used here. Manufacturing district.
Built vs. allowed density (FAR)
0.00 built / 0.00 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 4119000002 (Borough 4, Block 11900, Lot 2) · BIN 4594718, 4594716, 4459552, 4594714, 4594719, 4594731, 4459553, 4459546, 4594728, 4459547, 4594730, 4594721, 4594707, 4594727, 4594735, 4594710, 4594723, 4594712, 4594708, 4594724, 4594734, 4594720, 4617518, 4594706, 4459549, 4594709, 4594711, 4594713, 4594717, 4594732, 4459550, 4594726, 4594704, 4594705, 4594722, 4459551, 4155493BBL 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)
$0The 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
$0The portion of market value that taxes are calculated on (capped by law for small homes).
Tax class
Tax class 3 – utility property
Tax yearRollMarket valueAssessed valueTax class
2027Final$0$03
2026Final$0$03
2025Final$0$03

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

Sales & deed history 0

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.

No records found in this dataset for this lot.

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 20 open of 37

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 Entire · 2026-10-06
Q00456972-S1
DOB NOW
Alteration2026-10-05$100
Permitted, not signed off
Permit Entire · 2025-09-17
Q00613113-S1
DOB NOW
Alteration2023-01-10$100,000
Permitted, not signed off
Permit Entire · 2026-09-25
Q00613113-I1
DOB NOW
Alteration2022-01-13$129,600
Permitted, not signed off
Permit Entire · 2026-10-27
Q00484262-I1
DOB NOW
Alteration2021-03-24$1,659,370
Permitted, not signed off
Permit Entire · 2026-09-22
Q00480814-I1
DOB NOW
Alteration2021-03-17$2,781,846
Permitted, not signed off
Permit Entire · 2026-09-28
Q00455338-I1
DOB NOW
Alteration2021-03-17$159,250
Permitted, not signed off
Permit Entire · 2026-09-28
Q00456972-I1
DOB NOW
Alteration2021-03-17$22,921,450
Permitted, not signed off
Permit Entire · 2026-09-28
Q00455302-I1
DOB NOW
Alteration2021-02-04$171,635
Permitted, not signed off
Permit Entire · 2024-10-28
Q00455360-I1
DOB NOW
Alteration2021-02-04$76,846
Permitted, not signed off
Permit Entire · 2026-09-18
Q00455351-I1
DOB NOW
Alteration2021-02-04$392,274
Permitted, not signed off
PERMIT ISSUED - ENTIRE JOB/WORK · 2018-07-16
421592994
BIS
A2 – Alteration with multiple work types (no change to use/occupancy)2018-05-11$553,963
Permitted, not signed off
PERMIT ISSUED - ENTIRE JOB/WORK · 2022-06-01
421084800
BIS
A2 – Alteration with multiple work types (no change to use/occupancy)2015-03-10$93,700
Permitted, not signed off
PERMIT ISSUED - ENTIRE JOB/WORK · 2016-04-06
421013110
BIS
A2 – Alteration with multiple work types (no change to use/occupancy)2014-10-09$85,594
Permitted, not signed off
PERMIT ISSUED - ENTIRE JOB/WORK · 2012-07-06
420589349
BIS
A3 – Minor alteration (one type of work)2012-07-03—
Permitted, not signed off
PERMIT ISSUED - ENTIRE JOB/WORK · 2011-04-27
420347725
BIS
A2 – Alteration with multiple work types (no change to use/occupancy)2011-04-26$54,000
Permitted, not signed off
PERMIT ISSUED - ENTIRE JOB/WORK · 2018-12-11
410194150
BIS
A2 – Alteration with multiple work types (no change to use/occupancy)2008-11-17$929,348
Permitted, not signed off
PERMIT ISSUED - ENTIRE JOB/WORK · 2018-11-27
410116654
BIS
A2 – Alteration with multiple work types (no change to use/occupancy)2008-05-28$300,000
Permitted, not signed off
PERMIT ISSUED - ENTIRE JOB/WORK · 2008-05-12
410065735
BIS
A2 – Alteration with multiple work types (no change to use/occupancy)2008-02-12$321,625
Permitted, not signed off
PERMIT ISSUED - ENTIRE JOB/WORK · 2007-08-29
402650243
BIS
A2 – Alteration with multiple work types (no change to use/occupancy)2007-08-20$100,000
Permitted, not signed off
PERMIT ISSUED - ENTIRE JOB/WORK · 2007-08-22
402532309
BIS
A2 – Alteration with multiple work types (no change to use/occupancy)2007-01-29$500,000

Showing 20 of 37 records. The API and the source dataset have the full list.

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 181

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
2026-10-272027-01-08Q00484262-I1
DOB NOW
Boiler Equipment
FILING HEREWITH CONTRACT JA-179: INSTALLATION OF BULK FUEL STORAGE TANKS (2),STANDBY GENERATOR DAY TANKS (2), BLACK START GENERATOR DAY TANK (1) AND FUEL FILL
Permit Issued
2026-10-062026-12-18Q00456972-S1
DOB NOW
Protection and Mechanical Methods
INSTALLATION AND USE OF TEMPORARY KNUCKLEBOOM AS PER PLANS FILED HEREWITH. NO CHANGE IN USE EGRESS, OR OCCUPANCY.
Permit Issued
2026-09-282027-06-01Q00456972-I1
DOB NOW
General Construction
FILING HEREWITH CONTRACT JA-179: INSTALLATION OF MECHANICAL AND ELECTRICAL EQUIPMENT, INCLUDING BLACK START GENERATOR (1), STANDBY GENERATORS (2), SYNCHRONIZING
Permit Issued
2026-09-282027-06-01Q00455338-I1
DOB NOW
Mechanical Systems
FILING HEREWITH CONTRACT JA-179: JAMAICA WRRF FILING FOR THE INSTALLATION OF HVAC UNITS FOR STANDBY GENERATOR ENCLOSURES (2), SYNCHRONIZNING SWITCHGEAR ENCLOSUR
Permit Issued
2026-09-282027-06-01Q00455302-I1
DOB NOW
General Construction
FILING HEREWITH CONTRACT JA-179: JAMAICA WRRF FILING FOR THE INSTALLATION OF ORNAMENTAL FENCE AND MASONRY WALL AS PER PLANS.
Permit Issued
2026-09-282027-06-01Q00456972-I1
DOB NOW
Mechanical Systems
FILING HEREWITH CONTRACT JA-179: INSTALLATION OF MECHANICAL AND ELECTRICAL EQUIPMENT, INCLUDING BLACK START GENERATOR (1), STANDBY GENERATORS (2), SYNCHRONIZING
Permit Issued
2026-09-282027-06-01Q00456972-I1
DOB NOW
Mechanical Systems
FILING HEREWITH CONTRACT JA-179: INSTALLATION OF MECHANICAL AND ELECTRICAL EQUIPMENT, INCLUDING BLACK START GENERATOR (1), STANDBY GENERATORS (2), SYNCHRONIZING
Permit Issued
2026-09-282027-06-01Q00456972-I1
DOB NOW
General Construction
FILING HEREWITH CONTRACT JA-179: INSTALLATION OF MECHANICAL AND ELECTRICAL EQUIPMENT, INCLUDING BLACK START GENERATOR (1), STANDBY GENERATORS (2), SYNCHRONIZING
Permit Issued
2026-09-222027-06-01Q00480814-I1
DOB NOW
Foundation
FILING HEREWITH CONTRACT JA-179: JAMAICA WRRF STRUCTURAL ACTIVITIES AS PER SUBMITTED PLANS.
Permit Issued
2026-09-222027-06-01Q00480814-I1
DOB NOW
General Construction
FILING HEREWITH CONTRACT JA-179: JAMAICA WRRF STRUCTURAL ACTIVITIES AS PER SUBMITTED PLANS.
Permit Issued
2026-09-222027-06-01Q00480814-I1
DOB NOW
Structural
FILING HEREWITH CONTRACT JA-179: JAMAICA WRRF STRUCTURAL ACTIVITIES AS PER SUBMITTED PLANS.
Permit Issued
2026-09-182027-06-01Q00455351-I1
DOB NOW
General Construction
SITE CLEARING, INCLUDING DEMOLITION OF EXISTING STANDBY GENERATORS, REMOTE RADIATOR, SWITCHGEAR & APPURTENANT EQUIPMENT; REMOVAL OF EXISTING TRAILERS, ASPHALT
Permit Issued

Showing 12 of 181 records. The API and the source dataset have the full list.

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 17 active of 82

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
2021-10-07E-ELEVATOR ELEVATORREQUIREDV100721E9027/709549
Active
V-DOB VIOLATION - ACTIVE
2021-10-07E-ELEVATOR ELEVATORREQUIREDV100721E9027/709548
Active
V-DOB VIOLATION - ACTIVE
2021-10-07E-ELEVATOR ELEVATORREQUIREDV100721E9027/709500
Active
V-DOB VIOLATION - ACTIVE
2020-09-01E-ELEVATOR ELEVATORREQUIREDV090120E9027/688594
Active
V-DOB VIOLATION - ACTIVE
2020-09-01E-ELEVATOR ELEVATORREQUIREDV090120E9027/688592
Active
V-DOB VIOLATION - ACTIVE
2020-09-01E-ELEVATOR ELEVATORREQUIREDV090120E9027/688593
Active
V-DOB VIOLATION - ACTIVE
2019-09-06ACC1-(OTHER BLDGS TYPES) - ELEVATOR AFFIRMATION OF CORRECTION ELEVATORREQUIREDVIO ISSUED TO ELEVATOR - FAIL TO CORRECT DEFECTS ON 2017 CAT 1 INSP/TST TSTV090619ACC110507
Active
V-DOB VIOLATION - ACTIVE
2019-08-19E-ELEVATOR ELEVATORREQUIREDV081919E9027/660205
Active
V-DOB VIOLATION - ACTIVE
2019-08-19E-ELEVATOR ELEVATORREQUIREDV081919E9027/660206
Active
V-DOB VIOLATION - ACTIVE
2019-04-05EVCAT1-ELEVATOR ANNUAL INSPECTION / TEST ELEVATORREQUIREDVIOLATION ISSUED TO ELEVATOR - FAILURE TO FILE CATEGORY 1 2017 INSPECTION/TESTV040519EVCAT105127
Active
V-DOB VIOLATION - ACTIVE
2018-07-31E-ELEVATOR ELEVATORREQUIREDV073118E9027/634073
Active
V-DOB VIOLATION - ACTIVE
2017-09-15EVCAT1-ELEVATOR ANNUAL INSPECTION / TEST ELEVATORREQUIREDVIOLATION ISSUED TO ELEVATOR-FAILURE TO FILE CATEGORY 1 2016 INSPECTION/TESTV091517EVCAT106061
Active
V-DOB VIOLATION - ACTIVE
2017-05-26E-ELEVATOR ELEVATORREQUIREDV052617E9027/603352
Active
V-DOB VIOLATION - ACTIVE
2017-05-26E-ELEVATOR ELEVATORREQUIREDV052617E9027/603353
Active
V-DOB VIOLATION - ACTIVE
2017-01-03ACC1-(OTHER BLDGS TYPES) - ELEVATOR AFFIRMATION OF CORRECTION ELEVATORREQUIREDVIO ISSUED TO ELEVATOR - FAIL TO CORRECT DEFECTS ON 2015 CAT 1 INSP/TSTV010317ACC111972

Showing 15 of 82 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) 0 active of 2

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.
1999-08-09Non-Hazardous2L,5B,11M,15B,22D,73T,36T. ALARM NOT WORKING, MISSING LIGHT COVER, LOWER HATCH DOOR ADJUST GAO BETWEEN DOORS. NYC DEVICE, PROVIDE ELEVATOR MOTOR ROOM SIGN FOR DOOR.$2,500 / $0 / $038089535R
Resolved
Hearing: WRITTEN OFF · Certification: CERTIFICATE ACCEPTED
Written off refers to the penalty, not the violation.
1998-07-06Non-Hazardous75U05,46O02,57O02,. 75- DEVICE TAGGED 5YR TEST. 46-CLEAN HOIST CABLES 57- CLEAN PIT$2,500 / $0 / $038075914J

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

OATH tickets (all agencies) 3 unpaid of 49

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
2023-10-02Fire Department Of NycINSPECTION AND TESTINGNYC DEP$2,000 / $0 / $2,000014085746H
Unpaid balance Default
DOCKETED · DEFAULTED
2023-10-02Fire Department Of NycCERTIFICATES OF FITNESS AND CERTIFICATES OF QUALIFICATIONMANISH PATEL$2,000 / $0 / $2,000014085710X
Unpaid balance Default
DOCKETED · DEFAULTED
2023-10-02Fire Department Of NycCERTIFICATES OF FITNESS AND CERTIFICATES OF QUALIFICATIONNYC DEP$2,000 / $0 / $2,000014085747J
No balance due
WRITTEN OFF · POP IN-VIOL
2026-09-30Fire Department Of NycFIRE PROTECTION SYSTEMS:FAIL TO PREVENT UNNECESSARY UNWARRANTED ALARMSNEW YORK CITY DEPARTMENT OF EN$0 / $0 / $0012190109R
Hearing pending
NEW ISSUANCE
2026-09-17Fire Department Of NycAFFIDAVITS, DESIGN INSTALLATION DOCUMENTS, AND OTHER DOCUMENTATIONNYC DEP$0 / $0 / $0014274160N
No balance due
WRITTEN OFF · POP IN-VIOL
2026-08-12Fire Department Of NycFIRE PROTECTION SYSTEMS:FAIL TO PREVENT UNNECESSARY UNWARRANTED ALARMSNEW YORK CITY DEPARTMENT OF EN$0 / $0 / $0012190106L
No balance due
WRITTEN OFF · POP IN-VIOL
2026-07-23Fire Department Of NycFIRE PROTECTION SYSTEMS:FAIL TO PREVENT UNNECESSARY UNWARRANTED ALARMSDEPARTMENT OF ENVIRONMENTAL PR$0 / $0 / $0012185910X
No balance due
WRITTEN OFF · POP IN-VIOL
2026-06-01Fire Department Of NycFIRE PROTECTION SYSTEMS:FAIL TO PREVENT UNNECESSARY UNWARRANTED ALARMSDEPARTMENT OF ENVIRONMENTAL PR$0 / $0 / $0012185912J
No balance due
WRITTEN OFF · POP IN-VIOL
2026-03-27Fire Department Of NycUNLAWFUL QUANTITY OR LOCATION OF REGULATED MATERIALNYC DEP$0 / $0 / $0014239192Y
No balance due
WRITTEN OFF · POP IN-VIOL
2026-01-27Fire Department Of NycFIRE PROTECTION SYSTEMS:FAIL TO PREVENT UNNECESSARY UNWARRANTED ALARMSDEPARTMENT OF ENVIRONMENTAL PR$0 / $0 / $0012185913L
No balance due
WRITTEN OFF · POP IN-VIOL
2026-01-05Fire Department Of NycFIRE PROTECTION SYSTEMS:FAIL TO PREVENT UNNECESSARY UNWARRANTED ALARMSDEPARTMENT OF ENVIRONMENTAL PR$0 / $0 / $0012185908R
No balance due
WRITTEN OFF · POP IN-VIOL
2025-11-03Fire Department Of NycFIRE PROTECTION SYSTEMS:FAIL TO PREVENT UNNECESSARY UNWARRANTED ALARMSDEPT OF ENVIRONMENTAL PROTECTI$0 / $0 / $0012175534M

Showing 12 of 49 records. The API and the source dataset have the full list.

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.

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 2026-10-28; 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 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 2026-10-31; 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) 17

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
2026-05-20DEPPlant – Plants- Odor Related Problems (PO1)Closed2026-05-20
2026-05-18DEPPlant – Plants- Odor Related Problems (PO1)Closed2026-05-18
2026-05-18DEPPlant – Plants- Odor Related Problems (PO1)Closed2026-05-18
2026-05-16DEPPlant – Plants- Odor Related Problems (PO1)Closed2026-05-16
2026-05-05DEPPlant – Plants- Odor Related Problems (PO1)Closed2026-05-05
2026-04-17DEPPlant – Plants- Odor Related Problems (PO1)Closed2026-04-17
2026-04-15DEPPlant – Plants- Odor Related Problems (PO1)Closed2026-04-15
2026-04-14DEPPlant – Plants- Odor Related Problems (PO1)Closed2026-04-14
2026-02-18NYPDIllegal Parking – Commercial Overnight ParkingClosed2026-02-18
2026-02-18NYPDIllegal Parking – Detached TrailerClosed2026-02-18

Showing 10 of 17 records. The API and the source dataset have the full list.

Source: 311 Service Requests from 2020 to Present — city dataset updated 2026-11-01; data as of 2026-11-01

Nearby properties

On Nassau Blvd

Same tax block (11900)

All properties on Nassau Blvd, Queens · All of Queens 11430 (South Ozone Park)

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