{
  "title": "Suffolk County, Massachusetts property research",
  "records": 208724,
  "fields": 68,
  "owners": 208582,
  "tax_mailing_addresses": 208552,
  "site_addresses": 208642,
  "geometries": 208720,
  "flood_full_mapping": 208328,
  "school_context": 208720,
  "assessor_zoning_attributes": 15501,
  "zoning_full_mapping": 0,
  "zoning_any_mapping": 0,
  "sfha_intersects": 20097,
  "assessment_years": {
    "2026": 28201,
    "2023": 180441,
    "None": 82
  },
  "source_acquisition_dates": {},
  "import_dates": {
    "2026-09-23T18:14:55.491482+00:00": 208724
  },
  "county_geometry_validation": {
    "valid_inside_county": 208720,
    "invalid_or_missing_geometry": 4
  },
  "excluded_outside_county": 16,
  "scope": "Imported county parcel selection, all represented tax classes and lot sizes; completeness against a current assessor roll is not certified.",
  "usd_total": 9,
  "geometry_recovered_exact_duplicate_rings": 0,
  "nwi_overlap_records": 6245,
  "nwi_project_full_mapping": 208699,
  "field_nonempty": {
    "nwi_status": 208724,
    "nwi_overlap_pct": 208699,
    "nwi_overlap_acres": 208699,
    "nwi_codes": 6245,
    "nwi_types": 6245,
    "nwi_project_coverage_pct": 208720,
    "nwi_imagery_years": 208715,
    "nwi_source_url": 208724,
    "nwi_retrieved_at_utc": 208724,
    "nwi_review_flags": 6266,
    "mapped_area_outside_sfha_acres": 208709
  },
  "nwi_updated_at_utc": "2026-09-23T19:55:22.200678+00:00",
  "assessment_update": {
    "original_records": 208724,
    "current_source_records": 184552,
    "current_assessment_years": {
      "2026": 184552
    },
    "original_record_match_counts": {
      "outside_boston_scope": 28266,
      "owner_text_changed": 32195,
      "mailing_text_changed": 65937,
      "assessed_total_value_changed": 156713,
      "unique_exact_source_key": 179854,
      "owner_mail_review_queue": 72155,
      "no_current_pid_match": 580,
      "map_key_differs_or_missing": 7,
      "original_key_incomplete": 17
    },
    "matched_original_assessment_years": {
      "2023": 179854
    },
    "current_records_without_unique_original_match": 4698,
    "retrieved_at_utc": "2026-09-23T19:58:14.691550+00:00",
    "source_url": "https://data.boston.gov/dataset/e02c44d2-3c64-459c-8fe2-e1ce5f38a035/resource/ee73430d-96c0-423e-ad21-c4cfb54c8961/download/fy2026-property-assessment-data_rev.csv",
    "source_sha256": "d0b656f516162c56a92782a255c731b967bd551b3e26cf412e080fdf041791fa",
    "license_url": "http://www.opendefinition.org/licenses/odc-pddl",
    "license_id": "odc-pddl",
    "attribution": "City of Boston, Assessing Department; Property Assessment FY2026, revision published May 22, 2026.",
    "source_provider": "City of Boston",
    "source_formats": "CSV (attributes only; no new geometry)",
    "current_geometry_supplied": false,
    "scope": "Boston only (MassGIS TOWN_ID 35), not all Suffolk County municipalities. Other municipalities remain outside this comparison.",
    "match_key": "MassGIS TOWN_ID 35 + PROP_ID = Boston PID + MAP_PAR_ID = Boston GIS_ID. Both identifiers must match exactly, allowing only the documented trailing underscore on Boston identifier strings. Leading zeros are preserved.",
    "method": "Unique source keys only; both original and current matches checked for uniqueness. No address, name, fuzzy, spatial or padded-number matching. Incomplete identifiers, unmatched PIDs and map-key discrepancies remain unresolved. All original records remain in the review CSV. The separate source-location exceptions remain included unchanged.",
    "change_semantics": "Owner and mailing differences are text changes, including formatting changes, not confirmed sales, legal title, delivery validation or seller intent. Monetary comparisons ignore commas and decimal formatting; assessment differences are not market appreciation or tax bills. A zero original assessed total has no percentage difference. FY2026 is an assessment year, not current ownership verification.",
    "current_unmatched_semantics": "Current records without a unique original match are a reconciliation queue, not necessarily newly created parcels.",
    "catalog_vintage": "Mixed source fiscal years + Boston-only FY2026 assessment review",
    "dictionary_url": "https://data.boston.gov/dataset/e02c44d2-3c64-459c-8fe2-e1ce5f38a035/resource/440f72b7-bb2c-4c37-971f-c1097d155559/download/property-assessment-fy2026-data-key.pdf"
  }
}