{
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  "postcodes": [
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  "latitude": 51.5274771747308,
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  "location_precision": "postcode_centroid",
  "sale_count": 2,
  "first_sale_date": "2011-06-29",
  "last_sale_date": "2015-07-30",
  "last_price": 1115000,
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      "duration": "L",
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      "saon": "SECOND AND THIRD FLOOR FLAT",
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      "town_city": "LONDON",
      "district": "CITY OF WESTMINSTER",
      "county": "GREATER LONDON",
      "ppd_category_type": "A",
      "last_seen_at": "2026-07-09T18:56:26.350736+00:00",
      "address_path": "w9/castellain-road/66/second-and-third-floor-flat",
      "property_url": "https://openproperties.uk/w9/castellain-road/66/second-and-third-floor-flat"
    },
    {
      "url": "https://openproperties.uk/w9/castellain-road/66/second-and-third-floor-flat/37fe2c93-e022-42af-9d94-693e7b1eee26",
      "transaction_id": "37FE2C93-E022-42AF-9D94-693E7B1EEE26",
      "price": 790000,
      "date_of_transfer": "2011-06-29",
      "postcode": "W9 1EX",
      "property_type": "F",
      "property_type_display": "Flat/maisonette",
      "new_build": false,
      "duration": "L",
      "duration_display": "Leasehold",
      "paon": "66",
      "saon": "SECOND AND THIRD FLOOR FLAT",
      "street": "CASTELLAIN ROAD",
      "locality": null,
      "town_city": "LONDON",
      "district": "CITY OF WESTMINSTER",
      "county": "GREATER LONDON",
      "ppd_category_type": "A",
      "last_seen_at": "2026-07-09T18:56:26.350736+00:00",
      "address_path": "w9/castellain-road/66/second-and-third-floor-flat",
      "property_url": "https://openproperties.uk/w9/castellain-road/66/second-and-third-floor-flat"
    }
  ],
  "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
    }
  ]
}