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      "address_path": "w1j/hay-hill/berkeley-house-15/flat-22",
      "property_url": "https://openproperties.uk/w1j/hay-hill/berkeley-house-15/flat-22"
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      "url": "https://openproperties.uk/w1j/hay-hill/berkeley-house-15/flat-22/f67c639d-a322-4da9-bc7d-438e23c5b9bb",
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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": "w1j/hay-hill/berkeley-house-15/flat-22",
      "property_url": "https://openproperties.uk/w1j/hay-hill/berkeley-house-15/flat-22"
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    {
      "url": "https://openproperties.uk/w1j/hay-hill/berkeley-house-15/flat-22/f54f918d-29f6-4788-b241-76a511c52105",
      "transaction_id": "F54F918D-29F6-4788-B241-76A511C52105",
      "price": 215000,
      "date_of_transfer": "1999-08-20",
      "postcode": "W1J 8NS",
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      "duration": "L",
      "duration_display": "Leasehold",
      "paon": "BERKELEY HOUSE, 15",
      "saon": "FLAT 22",
      "street": "HAY HILL",
      "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": "w1j/hay-hill/berkeley-house-15/flat-22",
      "property_url": "https://openproperties.uk/w1j/hay-hill/berkeley-house-15/flat-22"
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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
    }
  ]
}