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      "ppd_category_type": "A",
      "last_seen_at": "2026-07-09T18:56:26.350736+00:00",
      "address_path": "hp3/old-dean/30a",
      "property_url": "https://openproperties.uk/hp3/old-dean/30a"
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    {
      "url": "https://openproperties.uk/hp3/old-dean/30a/b187daf5-40ca-4a11-9709-fe4a6af49ffb",
      "transaction_id": "B187DAF5-40CA-4A11-9709-FE4A6AF49FFB",
      "price": 154000,
      "date_of_transfer": "2004-08-06",
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      "duration": "L",
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      "paon": "30A",
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      "street": "OLD DEAN",
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      "town_city": "HEMEL HEMPSTEAD",
      "district": "DACORUM",
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      "ppd_category_type": "A",
      "last_seen_at": "2026-07-09T18:56:26.350736+00:00",
      "address_path": "hp3/old-dean/30a",
      "property_url": "https://openproperties.uk/hp3/old-dean/30a"
    },
    {
      "url": "https://openproperties.uk/hp3/old-dean/30a/88100080-be34-4b95-983a-e5b7e683e7c5",
      "transaction_id": "88100080-BE34-4B95-983A-E5B7E683E7C5",
      "price": 70000,
      "date_of_transfer": "1999-01-19",
      "postcode": "HP3 0ET",
      "property_type": "S",
      "property_type_display": "Semi-detached",
      "new_build": false,
      "duration": "L",
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      "paon": "30A",
      "saon": null,
      "street": "OLD DEAN",
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      "town_city": "HEMEL HEMPSTEAD",
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      "ppd_category_type": "A",
      "last_seen_at": "2026-07-09T18:56:26.350736+00:00",
      "address_path": "hp3/old-dean/30a",
      "property_url": "https://openproperties.uk/hp3/old-dean/30a"
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  ],
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains HM Land Registry data © Crown copyright and database right. This data is licensed under the Open Government Licence v3.0. Contains OS data © Crown copyright and database right. Postcode locations are Code-Point Open centroids — they locate the postcode, not an individual building.",
  "provenance": [
    {
      "source": "HM Land Registry Price Paid Data",
      "source_url": "https://www.gov.uk/government/statistical-data-sets/price-paid-data-downloads",
      "retrieved_at": "2026-07-09T18:56:26.350736+00:00"
    },
    {
      "source": "OS Code-Point Open",
      "source_url": "https://osdatahub.os.uk/downloads/open/CodePointOpen",
      "retrieved_at": null
    }
  ]
}