{
  "title": "Real estate appraisal comparable-source data for AI",
  "source_page": "https://fiund.com/industries/real-estate-appraisal-comparable-data",
  "authorship": "Original fictional Fiund editorial exercise. No actual operating records or third-party source assets are included.",
  "example": {
    "title": "A comparable's corrected attribute must retain its source and date",
    "context": "Two fictional sales and invented property descriptions form an evidence-retrieval task. The exercise makes no property valuation, lending or housing eligibility decision.",
    "records": [
      [
        "AC1",
        "Mock public-style record",
        "Sale A: area 100 practice units, source dated day 1. Sale B: area 110, dated day 1."
      ],
      [
        "AC2",
        "Authorized observation correction",
        "Sale A area corrected to 105 under source S2 on day 5. No correction applies to B."
      ],
      [
        "AC3",
        "Conflicting source S3",
        "Sale A area 103 on day 6; no authority or supersession rule resolves S2 versus S3."
      ]
    ],
    "question": "Which sources support each area figure, and can the newest timestamp alone establish a single authoritative Sale A value?",
    "answer": "AC2 explicitly corrects AC1's Sale A figure from 100 to 105 under S2. AC3 supplies a later conflicting value of 103 but no rule establishing priority over S2. Report the conflict with both sources and dates rather than choosing by timestamp alone. Sale B remains 110 under AC1, unaffected by A's corrections. No valuation can be derived from this source-reconciliation exercise.",
    "failureModes": [
      "Applying Sale A's corrected area to Sale B.",
      "Declaring the newest source authoritative without a stated priority or verification basis."
    ],
    "fields": [
      [
        "Comparable identity and attribute",
        "Keeps corrections specific to a property-like record and field."
      ],
      [
        "Source, date and authority",
        "Makes competing evidence inspectable."
      ],
      [
        "Explicit supersession versus conflict",
        "Distinguishes an accepted correction from an unresolved alternative."
      ]
    ],
    "holdout": "Add an authorized reconciliation selecting S3 for A but no sale-price evidence. The model should resolve the attribute while still withholding a value estimate.",
    "boundary": "Use fabricated descriptions and sales. Exclude real appraisals, borrowers, locations, listing feeds and property photographs."
  }
}