{
 "code_insee": "78418",
 "nom": "Montesson",
 "departement": "78",
 "annee_reference": 2025,
 "prix_m2_median": 4747,
 "prix_m2_median_appartement": 4145,
 "prix_m2_median_appartement_yoy_pct": 2.2,
 "prix_m2_median_maison": 5320,
 "prix_m2_median_maison_yoy_pct": -2.1,
 "prix_vente_median": 337500,
 "ventes_annee_reference": 176,
 "ventes_5_ans": 885,
 "fiabilite": "Forte",
 "series_annuelles": [
  {
   "annee": 2021,
   "apt": 4133,
   "apt_n": 113,
   "maison": 5956,
   "maison_n": 108
  },
  {
   "annee": 2022,
   "apt": 4529,
   "apt_n": 120,
   "maison": 6092,
   "maison_n": 106
  },
  {
   "annee": 2023,
   "apt": 4324,
   "apt_n": 73,
   "maison": 5450,
   "maison_n": 66
  },
  {
   "annee": 2024,
   "apt": 4054,
   "apt_n": 72,
   "maison": 5432,
   "maison_n": 51
  },
  {
   "annee": 2025,
   "apt": 4145,
   "apt_n": 90,
   "maison": 5320,
   "maison_n": 86
  }
 ],
 "tranches_surface": {
  "Appartement": [
   {
    "band": "< 30 m²",
    "median": 4765,
    "n": 16
   },
   {
    "band": "30-60 m²",
    "median": 4221,
    "n": 62
   },
   {
    "band": "60-90 m²",
    "median": 4129,
    "n": 71
   },
   {
    "band": "90-120 m²",
    "median": 3280,
    "n": 13
   },
   {
    "band": "120 m² et +",
    "median": null,
    "n": 0
   }
  ],
  "Maison": [
   {
    "band": "< 30 m²",
    "median": 6501,
    "n": 1
   },
   {
    "band": "30-60 m²",
    "median": 5926,
    "n": 17
   },
   {
    "band": "60-90 m²",
    "median": 6058,
    "n": 31
   },
   {
    "band": "90-120 m²",
    "median": 5559,
    "n": 30
   },
   {
    "band": "120 m² et +",
    "median": 4813,
    "n": 58
   }
  ]
 },
 "est_hub_arrondissements": false,
 "arrondissements": null,
 "source": {
  "dataset": "Demandes de valeurs foncières (DVF), DGFiP",
  "url": "https://www.data.gouv.fr/fr/datasets/demandes-de-valeurs-foncieres/",
  "licence": "Licence Ouverte 2.0",
  "methodologie": "https://foncierdata.fr/methodologie"
 },
 "page": "https://foncierdata.fr/prix-immobilier/78418-montesson"
}