{
  "url": "https://openproperties.uk/w1u/chiltern-street/portman-mansions/flat-1f",
  "address_path": "w1u/chiltern-street/portman-mansions/flat-1f",
  "paon": "PORTMAN MANSIONS",
  "saon": "FLAT 1F",
  "street": "CHILTERN STREET",
  "locality": null,
  "town_city": "LONDON",
  "district": "CITY OF WESTMINSTER",
  "county": "GREATER LONDON",
  "postcode": "W1U 5AJ",
  "postcodes": [
    "W1U 5AJ"
  ],
  "latitude": 51.521982993703084,
  "longitude": -0.15605675906062227,
  "location_precision": "postcode_centroid",
  "sale_count": 2,
  "first_sale_date": "2011-04-05",
  "last_sale_date": "2011-10-21",
  "last_price": 1575000,
  "truncated": false,
  "sales": [
    {
      "url": "https://openproperties.uk/w1u/chiltern-street/portman-mansions/flat-1f/0926793e-9f0f-4071-a529-9d5a1e26c0c8",
      "transaction_id": "0926793E-9F0F-4071-A529-9D5A1E26C0C8",
      "price": 1575000,
      "date_of_transfer": "2011-10-21",
      "postcode": "W1U 5AJ",
      "property_type": "F",
      "property_type_display": "Flat/maisonette",
      "new_build": false,
      "duration": "L",
      "duration_display": "Leasehold",
      "paon": "PORTMAN MANSIONS",
      "saon": "FLAT 1F",
      "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-1f",
      "property_url": "https://openproperties.uk/w1u/chiltern-street/portman-mansions/flat-1f"
    },
    {
      "url": "https://openproperties.uk/w1u/chiltern-street/portman-mansions/flat-1f/04326e60-7bdc-4eb4-9243-27a0994d7c8e",
      "transaction_id": "04326E60-7BDC-4EB4-9243-27A0994D7C8E",
      "price": 1075000,
      "date_of_transfer": "2011-04-05",
      "postcode": "W1U 5AJ",
      "property_type": "F",
      "property_type_display": "Flat/maisonette",
      "new_build": false,
      "duration": "L",
      "duration_display": "Leasehold",
      "paon": "PORTMAN MANSIONS",
      "saon": "FLAT 1F",
      "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-1f",
      "property_url": "https://openproperties.uk/w1u/chiltern-street/portman-mansions/flat-1f"
    }
  ],
  "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
    }
  ]
}