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  "slug": "aachen",
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      "ym": "2025-04",
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      "ym": "2025-05",
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      "ym": "2025-07",
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      "ym": "2025-08",
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      "ym": "2026-06",
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    {
      "ym": "2026-07",
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    {
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      "grp": "1900–1949",
      "n": 77
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    {
      "grp": "1950–1979",
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    {
      "grp": "1980–1999",
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    {
      "grp": "ab 2000",
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    {
      "grp": "unbekannt",
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      "grp": "Gepflegt",
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    {
      "grp": "Keine Angabe",
      "n": 313
    },
    {
      "grp": "Neubau",
      "n": 86
    },
    {
      "grp": "Top-Zustand",
      "n": 57
    },
    {
      "grp": "Renovierungsbedarf",
      "n": 27
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  "national_med_price": 289000.0,
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      {
        "key": "overall",
        "label": "Gesamt",
        "unit": "€/m²",
        "months": [
          "2023-09",
          "2023-10",
          "2023-11",
          "2023-12",
          "2024-01",
          "2024-02",
          "2024-03",
          "2024-04",
          "2024-05",
          "2024-06",
          "2024-07",
          "2024-08",
          "2024-09",
          "2024-10",
          "2024-11",
          "2024-12",
          "2025-01",
          "2025-02",
          "2025-03",
          "2025-04",
          "2025-05",
          "2025-06",
          "2025-07",
          "2025-08",
          "2025-09",
          "2025-10",
          "2025-11",
          "2025-12",
          "2026-01",
          "2026-02",
          "2026-03",
          "2026-04",
          "2026-05",
          "2026-06",
          "2026-07",
          "2026-08"
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            "label": "Gesamtmarkt",
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              "2023-10",
              "2023-11",
              "2023-12",
              "2024-01",
              "2024-02",
              "2024-03",
              "2024-04",
              "2024-05",
              "2024-06",
              "2024-07",
              "2024-08",
              "2024-09",
              "2024-10",
              "2024-11",
              "2024-12",
              "2025-01",
              "2025-02",
              "2025-03",
              "2025-04",
              "2025-05",
              "2025-06",
              "2025-07",
              "2025-08",
              "2025-09",
              "2025-10",
              "2025-11",
              "2025-12",
              "2026-01",
              "2026-02",
              "2026-03",
              "2026-04",
              "2026-05",
              "2026-06",
              "2026-07",
              "2026-08"
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              98.0,
              98.5,
              96.8,
              94.4,
              93.4,
              92.1,
              91.6,
              89.5,
              92.7,
              92.9,
              93.1,
              93.4,
              92.8,
              92.6,
              89.4,
              89.9,
              90.3,
              91.3,
              93.4,
              94.9,
              98.6,
              98.8,
              99.5,
              102.5,
              100.5,
              100.2,
              97.5,
              97.4,
              96.8,
              94.0,
              95.0,
              94.6,
              93.6,
              92.7
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        "2023-10",
        "2023-11",
        "2023-12",
        "2024-01",
        "2024-02",
        "2024-03",
        "2024-04",
        "2024-05",
        "2024-06",
        "2024-07",
        "2024-08",
        "2024-09",
        "2024-10",
        "2024-11",
        "2024-12",
        "2025-01",
        "2025-02",
        "2025-03",
        "2025-04",
        "2025-05",
        "2025-06",
        "2025-07",
        "2025-08",
        "2025-09",
        "2025-10",
        "2025-11",
        "2025-12",
        "2026-01",
        "2026-02",
        "2026-03",
        "2026-04",
        "2026-05",
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        "2026-07",
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        92.7
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        },
        {
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        },
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          "label": "4 Zimmer",
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      "key": "size",
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        {
          "label": "80–120 m²",
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          "delta": -1
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        {
          "label": "über 120 m²",
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          "delta": 13
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      "key": "energy",
      "label": "Energieklasse",
      "unit": "€/m²",
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        {
          "label": "Mittel (C–D)",
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          "delta": -7
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    {
      "key": "type",
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          "label": "Standard",
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          "share": 83,
          "delta": -2
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        {
          "label": "Erdgeschoss",
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      "key": "tenancy",
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      "quality": "hoch",
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}