{
 "code_insee": "78420",
 "nom": "Montfort-l'Amaury",
 "departement": "78",
 "annee_reference": 2025,
 "prix_m2_median": 4441,
 "prix_m2_median_appartement": 3467,
 "prix_m2_median_appartement_yoy_pct": -30.7,
 "prix_m2_median_maison": 4615,
 "prix_m2_median_maison_yoy_pct": 12.2,
 "prix_vente_median": 268850,
 "ventes_annee_reference": 26,
 "ventes_5_ans": 144,
 "fiabilite": "Modérée",
 "derniers_12_mois": {
  "debut": "2025-07-01",
  "fin": "2026-06-30",
  "ventes": 22,
  "prix_m2_median": 4240,
  "prix_m2_median_appartement": 5049,
  "prix_m2_median_appartement_yoy_pct": 31.5,
  "prix_m2_median_maison": 3782,
  "prix_m2_median_maison_yoy_pct": -21.9
 },
 "series_annuelles": [
  {
   "annee": 2021,
   "apt": 3921,
   "apt_n": 9,
   "maison": 4017,
   "maison_n": 8
  },
  {
   "annee": 2022,
   "apt": 4476,
   "apt_n": 23,
   "maison": 4783,
   "maison_n": 24
  },
  {
   "annee": 2023,
   "apt": 4027,
   "apt_n": 8,
   "maison": 4552,
   "maison_n": 11
  },
  {
   "annee": 2024,
   "apt": 5000,
   "apt_n": 9,
   "maison": 4115,
   "maison_n": 13
  },
  {
   "annee": 2025,
   "apt": 3467,
   "apt_n": 9,
   "maison": 4615,
   "maison_n": 17
  }
 ],
 "tranches_surface": {
  "Appartement": [
   {
    "band": "< 30 m²",
    "median": 5000,
    "n": 5
   },
   {
    "band": "30-60 m²",
    "median": 5725,
    "n": 5
   },
   {
    "band": "60-90 m²",
    "median": 3467,
    "n": 5
   },
   {
    "band": "90-120 m²",
    "median": 3289,
    "n": 2
   },
   {
    "band": "120 m² et +",
    "median": 2140,
    "n": 1
   }
  ],
  "Maison": [
   {
    "band": "< 30 m²",
    "median": 6855,
    "n": 1
   },
   {
    "band": "30-60 m²",
    "median": 5176,
    "n": 4
   },
   {
    "band": "60-90 m²",
    "median": 4739,
    "n": 13
   },
   {
    "band": "90-120 m²",
    "median": 4615,
    "n": 5
   },
   {
    "band": "120 m² et +",
    "median": 3869,
    "n": 7
   }
  ]
 },
 "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/78420-montfort-l-amaury"
}