{
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  "town_city": "LONDON",
  "district": "CITY OF WESTMINSTER",
  "county": "GREATER LONDON",
  "postcode": "W1U 6NX",
  "postcodes": [
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  "latitude": 51.52113083559027,
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  "location_precision": "postcode_centroid",
  "sale_count": 4,
  "first_sale_date": "2006-06-23",
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      "county": "GREATER LONDON",
      "ppd_category_type": "A",
      "last_seen_at": "2026-07-09T18:56:26.350736+00:00",
      "address_path": "w1u/chiltern-street/portman-mansions/flat-14d",
      "property_url": "https://openproperties.uk/w1u/chiltern-street/portman-mansions/flat-14d"
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    {
      "url": "https://openproperties.uk/w1u/chiltern-street/portman-mansions/flat-14d/ef3381a6-50af-4af2-a2da-1e2d72a9c709",
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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": "w1u/chiltern-street/portman-mansions/flat-14d",
      "property_url": "https://openproperties.uk/w1u/chiltern-street/portman-mansions/flat-14d"
    },
    {
      "url": "https://openproperties.uk/w1u/chiltern-street/portman-mansions/flat-14d/4f043c08-5526-4b6b-8700-b26d4472348b",
      "transaction_id": "4F043C08-5526-4B6B-8700-B26D4472348B",
      "price": 647500,
      "date_of_transfer": "2011-05-13",
      "postcode": "W1U 6NX",
      "property_type": "F",
      "property_type_display": "Flat/maisonette",
      "new_build": false,
      "duration": "L",
      "duration_display": "Leasehold",
      "paon": "PORTMAN MANSIONS",
      "saon": "FLAT 14D",
      "street": "CHILTERN STREET",
      "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": "w1u/chiltern-street/portman-mansions/flat-14d",
      "property_url": "https://openproperties.uk/w1u/chiltern-street/portman-mansions/flat-14d"
    },
    {
      "url": "https://openproperties.uk/w1u/chiltern-street/portman-mansions/flat-14d/a1638efe-8263-47fc-a16f-86b3ef7f028d",
      "transaction_id": "A1638EFE-8263-47FC-A16F-86B3EF7F028D",
      "price": 380000,
      "date_of_transfer": "2006-06-23",
      "postcode": "W1U 6NX",
      "property_type": "F",
      "property_type_display": "Flat/maisonette",
      "new_build": false,
      "duration": "L",
      "duration_display": "Leasehold",
      "paon": "PORTMAN MANSIONS",
      "saon": "FLAT 14D",
      "street": "CHILTERN STREET",
      "locality": "LONDON",
      "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": "w1u/chiltern-street/portman-mansions/flat-14d",
      "property_url": "https://openproperties.uk/w1u/chiltern-street/portman-mansions/flat-14d"
    }
  ],
  "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
    }
  ]
}