{
  "url": "https://openproperties.uk/sw1x/william-street",
  "outcode": "SW1X",
  "street": "WILLIAM STREET",
  "street_slug": "william-street",
  "property_count": 6,
  "truncated": false,
  "properties": [
    {
      "paon": "WILLIAM STREET HOUSE",
      "saon": "FLAT 1",
      "postcode": "SW1X 9HH",
      "sale_count": 1,
      "first_sale_date": "1996-01-03",
      "last_sale_date": "1996-01-03",
      "last_price": 400000,
      "url": "https://openproperties.uk/sw1x/william-street/william-street-house/flat-1"
    },
    {
      "paon": "WILLIAM STREET HOUSE",
      "saon": "FLAT 5",
      "postcode": "SW1X 9HH",
      "sale_count": 3,
      "first_sale_date": "1999-08-02",
      "last_sale_date": "2004-08-16",
      "last_price": 1850000,
      "url": "https://openproperties.uk/sw1x/william-street/william-street-house/flat-5"
    },
    {
      "paon": "WILLIAM STREET HOUSE, 1 - 9",
      "saon": "1",
      "postcode": "SW1X 9HH",
      "sale_count": 1,
      "first_sale_date": "2009-04-03",
      "last_sale_date": "2009-04-03",
      "last_price": 270000,
      "url": "https://openproperties.uk/sw1x/william-street/william-street-house-1-9/1"
    },
    {
      "paon": "1",
      "saon": "APARTMENT 4",
      "postcode": "SW1X 9HL",
      "sale_count": 1,
      "first_sale_date": "2023-09-29",
      "last_sale_date": "2023-09-29",
      "last_price": 15200000,
      "url": "https://openproperties.uk/sw1x/william-street/1/apartment-4"
    },
    {
      "paon": "1",
      "saon": "APARTMENT 7",
      "postcode": "SW1X 9HL",
      "sale_count": 1,
      "first_sale_date": "2024-03-12",
      "last_sale_date": "2024-03-12",
      "last_price": 2650000,
      "url": "https://openproperties.uk/sw1x/william-street/1/apartment-7"
    },
    {
      "paon": "1",
      "saon": "APARTMENT 9",
      "postcode": "SW1X 9HL",
      "sale_count": 1,
      "first_sale_date": "2025-09-30",
      "last_sale_date": "2025-09-30",
      "last_price": 2550000,
      "url": "https://openproperties.uk/sw1x/william-street/1/apartment-9"
    }
  ],
  "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.",
  "provenance": {
    "source": "HM Land Registry Price Paid Data",
    "source_url": "https://www.gov.uk/government/statistical-data-sets/price-paid-data-downloads",
    "retrieved_at": null
  }
}