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      "saon": null,
      "postcode": "E4 9QD",
      "sale_count": 3,
      "first_sale_date": "2015-01-28",
      "last_sale_date": "2025-10-03",
      "last_price": 1550000,
      "url": "https://openproperties.uk/e4/castle-avenue/16"
    },
    {
      "paon": "17",
      "saon": null,
      "postcode": "E4 9PY",
      "sale_count": 2,
      "first_sale_date": "2003-11-28",
      "last_sale_date": "2020-08-11",
      "last_price": 675000,
      "url": "https://openproperties.uk/e4/castle-avenue/17"
    },
    {
      "paon": "18",
      "saon": null,
      "postcode": "E4 9QD",
      "sale_count": 2,
      "first_sale_date": "2007-06-29",
      "last_sale_date": "2013-08-20",
      "last_price": 820000,
      "url": "https://openproperties.uk/e4/castle-avenue/18"
    },
    {
      "paon": "20",
      "saon": null,
      "postcode": "E4 9QD",
      "sale_count": 1,
      "first_sale_date": "2008-06-06",
      "last_sale_date": "2008-06-06",
      "last_price": 696590,
      "url": "https://openproperties.uk/e4/castle-avenue/20"
    },
    {
      "paon": "21",
      "saon": "FLAT 1",
      "postcode": "E4 9PY",
      "sale_count": 4,
      "first_sale_date": "1996-07-16",
      "last_sale_date": "2014-02-28",
      "last_price": 250000,
      "url": "https://openproperties.uk/e4/castle-avenue/21/flat-1"
    },
    {
      "paon": "21",
      "saon": "FLAT 2",
      "postcode": "E4 9PY",
      "sale_count": 2,
      "first_sale_date": "2001-11-27",
      "last_sale_date": "2022-06-24",
      "last_price": 360000,
      "url": "https://openproperties.uk/e4/castle-avenue/21/flat-2"
    },
    {
      "paon": "21",
      "saon": "FLAT 3",
      "postcode": "E4 9PY",
      "sale_count": 2,
      "first_sale_date": "2004-12-03",
      "last_sale_date": "2021-07-16",
      "last_price": 349000,
      "url": "https://openproperties.uk/e4/castle-avenue/21/flat-3"
    },
    {
      "paon": "21",
      "saon": "FLAT 4",
      "postcode": "E4 9PY",
      "sale_count": 3,
      "first_sale_date": "1997-08-01",
      "last_sale_date": "2013-12-06",
      "last_price": 230000,
      "url": "https://openproperties.uk/e4/castle-avenue/21/flat-4"
    },
    {
      "paon": "21",
      "saon": "FLAT 5",
      "postcode": "E4 9PY",
      "sale_count": 4,
      "first_sale_date": "1999-03-19",
      "last_sale_date": "2018-10-12",
      "last_price": 325000,
      "url": "https://openproperties.uk/e4/castle-avenue/21/flat-5"
    },
    {
      "paon": "21",
      "saon": "FLAT 6",
      "postcode": "E4 9PY",
      "sale_count": 2,
      "first_sale_date": "1999-07-16",
      "last_sale_date": "2013-04-19",
      "last_price": 215000,
      "url": "https://openproperties.uk/e4/castle-avenue/21/flat-6"
    },
    {
      "paon": "22",
      "saon": null,
      "postcode": "E4 9QD",
      "sale_count": 2,
      "first_sale_date": "2006-07-06",
      "last_sale_date": "2014-11-26",
      "last_price": 870000,
      "url": "https://openproperties.uk/e4/castle-avenue/22"
    },
    {
      "paon": "30",
      "saon": null,
      "postcode": "E4 9QD",
      "sale_count": 2,
      "first_sale_date": "2011-09-09",
      "last_sale_date": "2023-09-29",
      "last_price": 1140000,
      "url": "https://openproperties.uk/e4/castle-avenue/30"
    },
    {
      "paon": "30A",
      "saon": null,
      "postcode": "E4 9QD",
      "sale_count": 1,
      "first_sale_date": "1999-07-14",
      "last_sale_date": "1999-07-14",
      "last_price": 185000,
      "url": "https://openproperties.uk/e4/castle-avenue/30a"
    },
    {
      "paon": "31",
      "saon": "FLAT 1",
      "postcode": "E4 9PY",
      "sale_count": 2,
      "first_sale_date": "2006-11-06",
      "last_sale_date": "2016-03-18",
      "last_price": 325000,
      "url": "https://openproperties.uk/e4/castle-avenue/31/flat-1"
    },
    {
      "paon": "31",
      "saon": "FLAT 2",
      "postcode": "E4 9PY",
      "sale_count": 1,
      "first_sale_date": "2023-09-27",
      "last_sale_date": "2023-09-27",
      "last_price": 320000,
      "url": "https://openproperties.uk/e4/castle-avenue/31/flat-2"
    },
    {
      "paon": "31",
      "saon": "FLAT 3",
      "postcode": "E4 9PY",
      "sale_count": 3,
      "first_sale_date": "1998-11-02",
      "last_sale_date": "2023-02-03",
      "last_price": 342500,
      "url": "https://openproperties.uk/e4/castle-avenue/31/flat-3"
    },
    {
      "paon": "31",
      "saon": "FLAT 4",
      "postcode": "E4 9PY",
      "sale_count": 1,
      "first_sale_date": "2015-03-26",
      "last_sale_date": "2015-03-26",
      "last_price": 260000,
      "url": "https://openproperties.uk/e4/castle-avenue/31/flat-4"
    },
    {
      "paon": "31",
      "saon": "FLAT 5",
      "postcode": "E4 9PY",
      "sale_count": 2,
      "first_sale_date": "1996-11-27",
      "last_sale_date": "2022-04-22",
      "last_price": 355000,
      "url": "https://openproperties.uk/e4/castle-avenue/31/flat-5"
    },
    {
      "paon": "31",
      "saon": "FLAT 6",
      "postcode": "E4 9PY",
      "sale_count": 2,
      "first_sale_date": "2015-09-21",
      "last_sale_date": "2024-03-27",
      "last_price": 330000,
      "url": "https://openproperties.uk/e4/castle-avenue/31/flat-6"
    },
    {
      "paon": "31",
      "saon": "FLAT 7",
      "postcode": "E4 9PY",
      "sale_count": 4,
      "first_sale_date": "1997-06-26",
      "last_sale_date": "2025-01-10",
      "last_price": 355000,
      "url": "https://openproperties.uk/e4/castle-avenue/31/flat-7"
    },
    {
      "paon": "31",
      "saon": "FLAT 8",
      "postcode": "E4 9PY",
      "sale_count": 5,
      "first_sale_date": "1999-01-08",
      "last_sale_date": "2026-01-30",
      "last_price": 375000,
      "url": "https://openproperties.uk/e4/castle-avenue/31/flat-8"
    },
    {
      "paon": "31",
      "saon": "FLAT 9",
      "postcode": "E4 9PY",
      "sale_count": 2,
      "first_sale_date": "2017-03-17",
      "last_sale_date": "2026-03-18",
      "last_price": 420000,
      "url": "https://openproperties.uk/e4/castle-avenue/31/flat-9"
    },
    {
      "paon": "32",
      "saon": null,
      "postcode": "E4 9QD",
      "sale_count": 1,
      "first_sale_date": "2025-02-21",
      "last_sale_date": "2025-02-21",
      "last_price": 920000,
      "url": "https://openproperties.uk/e4/castle-avenue/32"
    },
    {
      "paon": "36",
      "saon": null,
      "postcode": "E4 9QD",
      "sale_count": 1,
      "first_sale_date": "2006-11-09",
      "last_sale_date": "2006-11-09",
      "last_price": 615000,
      "url": "https://openproperties.uk/e4/castle-avenue/36"
    },
    {
      "paon": "40",
      "saon": null,
      "postcode": "E4 9QD",
      "sale_count": 1,
      "first_sale_date": "2005-10-26",
      "last_sale_date": "2005-10-26",
      "last_price": 238238,
      "url": "https://openproperties.uk/e4/castle-avenue/40"
    },
    {
      "paon": "42",
      "saon": null,
      "postcode": "E4 9QD",
      "sale_count": 3,
      "first_sale_date": "1999-04-23",
      "last_sale_date": "2016-03-24",
      "last_price": 427500,
      "url": "https://openproperties.uk/e4/castle-avenue/42"
    },
    {
      "paon": "44",
      "saon": null,
      "postcode": "E4 9QD",
      "sale_count": 3,
      "first_sale_date": "2000-11-03",
      "last_sale_date": "2017-01-05",
      "last_price": 483000,
      "url": "https://openproperties.uk/e4/castle-avenue/44"
    },
    {
      "paon": "46",
      "saon": null,
      "postcode": "E4 9QD",
      "sale_count": 1,
      "first_sale_date": "2021-11-16",
      "last_sale_date": "2021-11-16",
      "last_price": 262500,
      "url": "https://openproperties.uk/e4/castle-avenue/46"
    },
    {
      "paon": "48",
      "saon": null,
      "postcode": "E4 9QD",
      "sale_count": 2,
      "first_sale_date": "1996-08-05",
      "last_sale_date": "2018-02-06",
      "last_price": 670000,
      "url": "https://openproperties.uk/e4/castle-avenue/48"
    }
  ],
  "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
  }
}