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      "last_sale_date": "2007-08-09",
      "last_price": 475000,
      "url": "https://openproperties.uk/w1j/hertford-street/8-9/flat-3"
    },
    {
      "paon": "8 - 9",
      "saon": "FLAT 101",
      "postcode": "W1J 7RJ",
      "sale_count": 3,
      "first_sale_date": "2007-06-20",
      "last_sale_date": "2024-04-10",
      "last_price": 1500000,
      "url": "https://openproperties.uk/w1j/hertford-street/8-9/flat-101"
    },
    {
      "paon": "8 - 9",
      "saon": "FLAT 102",
      "postcode": "W1J 7RJ",
      "sale_count": 1,
      "first_sale_date": "2005-04-25",
      "last_sale_date": "2005-04-25",
      "last_price": 480000,
      "url": "https://openproperties.uk/w1j/hertford-street/8-9/flat-102"
    },
    {
      "paon": "8 - 9",
      "saon": "FLAT 203",
      "postcode": "W1J 7RJ",
      "sale_count": 2,
      "first_sale_date": "2007-08-09",
      "last_sale_date": "2011-03-18",
      "last_price": 940000,
      "url": "https://openproperties.uk/w1j/hertford-street/8-9/flat-203"
    },
    {
      "paon": "8 - 9",
      "saon": "FLAT 204",
      "postcode": "W1J 7RJ",
      "sale_count": 2,
      "first_sale_date": "2006-07-28",
      "last_sale_date": "2010-01-18",
      "last_price": 950000,
      "url": "https://openproperties.uk/w1j/hertford-street/8-9/flat-204"
    },
    {
      "paon": "8 - 9",
      "saon": "FLAT 401",
      "postcode": "W1J 7RJ",
      "sale_count": 1,
      "first_sale_date": "2006-09-05",
      "last_sale_date": "2006-09-05",
      "last_price": 425000,
      "url": "https://openproperties.uk/w1j/hertford-street/8-9/flat-401"
    },
    {
      "paon": "8 - 9",
      "saon": "FLAT 402",
      "postcode": "W1J 7RJ",
      "sale_count": 1,
      "first_sale_date": "2006-09-06",
      "last_sale_date": "2006-09-06",
      "last_price": 425000,
      "url": "https://openproperties.uk/w1j/hertford-street/8-9/flat-402"
    },
    {
      "paon": "8 - 9",
      "saon": "FLAT 403",
      "postcode": "W1J 7RJ",
      "sale_count": 1,
      "first_sale_date": "2006-09-07",
      "last_sale_date": "2006-09-07",
      "last_price": 425000,
      "url": "https://openproperties.uk/w1j/hertford-street/8-9/flat-403"
    },
    {
      "paon": "8 - 9",
      "saon": "FLAT 404",
      "postcode": "W1J 7RJ",
      "sale_count": 1,
      "first_sale_date": "2006-09-08",
      "last_sale_date": "2006-09-08",
      "last_price": 425000,
      "url": "https://openproperties.uk/w1j/hertford-street/8-9/flat-404"
    },
    {
      "paon": "17",
      "saon": null,
      "postcode": "W1J 7RS",
      "sale_count": 1,
      "first_sale_date": "2025-05-13",
      "last_sale_date": "2025-05-13",
      "last_price": 14500000,
      "url": "https://openproperties.uk/w1j/hertford-street/17"
    },
    {
      "paon": "18",
      "saon": "SECOND FLOOR FLAT",
      "postcode": "W1J 7RT",
      "sale_count": 2,
      "first_sale_date": "1997-01-06",
      "last_sale_date": "1997-08-26",
      "last_price": 420000,
      "url": "https://openproperties.uk/w1j/hertford-street/18/second-floor-flat"
    },
    {
      "paon": "20",
      "saon": null,
      "postcode": "W1J 7RX",
      "sale_count": 1,
      "first_sale_date": "2024-05-07",
      "last_sale_date": "2024-05-07",
      "last_price": 18200000,
      "url": "https://openproperties.uk/w1j/hertford-street/20"
    },
    {
      "paon": "22 - 23",
      "saon": null,
      "postcode": "W1J 7RZ",
      "sale_count": 2,
      "first_sale_date": "2005-11-16",
      "last_sale_date": "2019-11-22",
      "last_price": 70500000,
      "url": "https://openproperties.uk/w1j/hertford-street/22-23"
    },
    {
      "paon": "36",
      "saon": null,
      "postcode": "W1J 7SE",
      "sale_count": 1,
      "first_sale_date": "2022-01-31",
      "last_sale_date": "2022-01-31",
      "last_price": 18349458,
      "url": "https://openproperties.uk/w1j/hertford-street/36"
    },
    {
      "paon": "37",
      "saon": null,
      "postcode": "W1J 7SF",
      "sale_count": 1,
      "first_sale_date": "2022-01-31",
      "last_sale_date": "2022-01-31",
      "last_price": 18349458,
      "url": "https://openproperties.uk/w1j/hertford-street/37"
    },
    {
      "paon": "39",
      "saon": null,
      "postcode": "W1J 7SQ",
      "sale_count": 2,
      "first_sale_date": "1997-01-21",
      "last_sale_date": "2023-02-13",
      "last_price": 7350000,
      "url": "https://openproperties.uk/w1j/hertford-street/39"
    },
    {
      "paon": "41",
      "saon": null,
      "postcode": "W1J 7SJ",
      "sale_count": 1,
      "first_sale_date": "1998-03-20",
      "last_sale_date": "1998-03-20",
      "last_price": 1200000,
      "url": "https://openproperties.uk/w1j/hertford-street/41"
    },
    {
      "paon": "41",
      "saon": "D",
      "postcode": "W1J 7SJ",
      "sale_count": 3,
      "first_sale_date": "2001-12-14",
      "last_sale_date": "2007-06-14",
      "last_price": 1050000,
      "url": "https://openproperties.uk/w1j/hertford-street/41/d"
    },
    {
      "paon": "41",
      "saon": "E",
      "postcode": "W1J 7SJ",
      "sale_count": 1,
      "first_sale_date": "2001-12-14",
      "last_sale_date": "2001-12-14",
      "last_price": 430000,
      "url": "https://openproperties.uk/w1j/hertford-street/41/e"
    },
    {
      "paon": "41",
      "saon": "FLAT E",
      "postcode": "W1J 7SJ",
      "sale_count": 1,
      "first_sale_date": "2018-06-29",
      "last_sale_date": "2018-06-29",
      "last_price": 1450000,
      "url": "https://openproperties.uk/w1j/hertford-street/41/flat-e"
    },
    {
      "paon": "41",
      "saon": "FOURTH AND FIFTH FLOOR FLAT",
      "postcode": "W1J 7SJ",
      "sale_count": 2,
      "first_sale_date": "2006-11-30",
      "last_sale_date": "2007-07-06",
      "last_price": 2450000,
      "url": "https://openproperties.uk/w1j/hertford-street/41/fourth-and-fifth-floor-flat"
    },
    {
      "paon": "42",
      "saon": null,
      "postcode": "W1J 7SL",
      "sale_count": 1,
      "first_sale_date": "2023-02-13",
      "last_sale_date": "2023-02-13",
      "last_price": 15700000,
      "url": "https://openproperties.uk/w1j/hertford-street/42"
    },
    {
      "paon": "46",
      "saon": null,
      "postcode": "W1J 7DP",
      "sale_count": 2,
      "first_sale_date": "2017-12-20",
      "last_sale_date": "2019-11-28",
      "last_price": 11995000,
      "url": "https://openproperties.uk/w1j/hertford-street/46"
    },
    {
      "paon": "47",
      "saon": null,
      "postcode": "W1J 7SW",
      "sale_count": 1,
      "first_sale_date": "2002-10-14",
      "last_sale_date": "2002-10-14",
      "last_price": 2200000,
      "url": "https://openproperties.uk/w1j/hertford-street/47"
    },
    {
      "paon": "48",
      "saon": null,
      "postcode": "W1J 7SP",
      "sale_count": 1,
      "first_sale_date": "2003-05-27",
      "last_sale_date": "2003-05-27",
      "last_price": 1360000,
      "url": "https://openproperties.uk/w1j/hertford-street/48"
    },
    {
      "paon": "49A",
      "saon": null,
      "postcode": "W1J 7SR",
      "sale_count": 1,
      "first_sale_date": "2024-06-28",
      "last_sale_date": "2024-06-28",
      "last_price": 1510000,
      "url": "https://openproperties.uk/w1j/hertford-street/49a"
    },
    {
      "paon": "51 - 52",
      "saon": "FIRST, SECOND AND THIRD FLOORS",
      "postcode": "W1J 7ST",
      "sale_count": 2,
      "first_sale_date": "2002-06-25",
      "last_sale_date": "2010-07-01",
      "last_price": 1900000,
      "url": "https://openproperties.uk/w1j/hertford-street/51-52/first-second-and-third-floors"
    },
    {
      "paon": "51 - 52",
      "saon": "FLAT 2",
      "postcode": "W1J 7ST",
      "sale_count": 1,
      "first_sale_date": "2011-10-11",
      "last_sale_date": "2011-10-11",
      "last_price": 1750000,
      "url": "https://openproperties.uk/w1j/hertford-street/51-52/flat-2"
    },
    {
      "paon": "51 - 52",
      "saon": "FLAT 3",
      "postcode": "W1J 7ST",
      "sale_count": 2,
      "first_sale_date": "2011-09-23",
      "last_sale_date": "2022-02-03",
      "last_price": 1525000,
      "url": "https://openproperties.uk/w1j/hertford-street/51-52/flat-3"
    }
  ],
  "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
  }
}