{
  "url": "https://openproperties.uk/w1u/chiltern-street/portman-mansions/flat-10f",
  "address_path": "w1u/chiltern-street/portman-mansions/flat-10f",
  "paon": "PORTMAN MANSIONS",
  "saon": "FLAT 10F",
  "street": "CHILTERN STREET",
  "locality": null,
  "town_city": "LONDON",
  "district": "CITY OF WESTMINSTER",
  "county": "GREATER LONDON",
  "postcode": "W1U 6NT",
  "postcodes": [
    "W1U 6NT"
  ],
  "latitude": 51.52147459725977,
  "longitude": -0.15632234313536336,
  "location_precision": "postcode_centroid",
  "sale_count": 4,
  "first_sale_date": "1996-09-16",
  "last_sale_date": "2016-03-31",
  "last_price": 1430000,
  "truncated": false,
  "sales": [
    {
      "url": "https://openproperties.uk/w1u/chiltern-street/portman-mansions/flat-10f/31fb4c17-afd5-57b9-e050-a8c063053436",
      "transaction_id": "31FB4C17-AFD5-57B9-E050-A8C063053436",
      "price": 1430000,
      "date_of_transfer": "2016-03-31",
      "postcode": "W1U 6NT",
      "property_type": "F",
      "property_type_display": "Flat/maisonette",
      "new_build": false,
      "duration": "L",
      "duration_display": "Leasehold",
      "paon": "PORTMAN MANSIONS",
      "saon": "FLAT 10F",
      "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-10f",
      "property_url": "https://openproperties.uk/w1u/chiltern-street/portman-mansions/flat-10f"
    },
    {
      "url": "https://openproperties.uk/w1u/chiltern-street/portman-mansions/flat-10f/a367d6b2-4c09-4c56-b5e8-57e214fd0483",
      "transaction_id": "A367D6B2-4C09-4C56-B5E8-57E214FD0483",
      "price": 1295000,
      "date_of_transfer": "2013-05-31",
      "postcode": "W1U 6NT",
      "property_type": "F",
      "property_type_display": "Flat/maisonette",
      "new_build": false,
      "duration": "L",
      "duration_display": "Leasehold",
      "paon": "PORTMAN MANSIONS",
      "saon": "FLAT 10F",
      "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-10f",
      "property_url": "https://openproperties.uk/w1u/chiltern-street/portman-mansions/flat-10f"
    },
    {
      "url": "https://openproperties.uk/w1u/chiltern-street/portman-mansions/flat-10f/a1851437-4c7c-4f76-8798-31ed8914cc26",
      "transaction_id": "A1851437-4C7C-4F76-8798-31ED8914CC26",
      "price": 340000,
      "date_of_transfer": "2001-05-25",
      "postcode": "W1U 6NT",
      "property_type": "F",
      "property_type_display": "Flat/maisonette",
      "new_build": false,
      "duration": "L",
      "duration_display": "Leasehold",
      "paon": "PORTMAN MANSIONS",
      "saon": "FLAT 10F",
      "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-10f",
      "property_url": "https://openproperties.uk/w1u/chiltern-street/portman-mansions/flat-10f"
    },
    {
      "url": "https://openproperties.uk/w1u/chiltern-street/portman-mansions/flat-10f/b03ff947-fe6c-4a09-9d8e-dfad21b3acfd",
      "transaction_id": "B03FF947-FE6C-4A09-9D8E-DFAD21B3ACFD",
      "price": 195000,
      "date_of_transfer": "1996-09-16",
      "postcode": "W1U 6NT",
      "property_type": "F",
      "property_type_display": "Flat/maisonette",
      "new_build": false,
      "duration": "L",
      "duration_display": "Leasehold",
      "paon": "PORTMAN MANSIONS",
      "saon": "FLAT 10F",
      "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-10f",
      "property_url": "https://openproperties.uk/w1u/chiltern-street/portman-mansions/flat-10f"
    }
  ],
  "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
    }
  ]
}