{
 "code_insee": "91243",
 "nom": "Fontenay-lès-Briis",
 "departement": "91",
 "annee_reference": 2025,
 "prix_m2_median": 3035,
 "prix_m2_median_appartement": 3554,
 "prix_m2_median_appartement_yoy_pct": 15.1,
 "prix_m2_median_maison": 2950,
 "prix_m2_median_maison_yoy_pct": -9,
 "prix_vente_median": 308600,
 "ventes_annee_reference": 31,
 "ventes_5_ans": 104,
 "fiabilite": "Modérée",
 "derniers_12_mois": {
  "debut": "2025-07-01",
  "fin": "2026-06-30",
  "ventes": 24,
  "prix_m2_median": 3110,
  "prix_m2_median_appartement": null,
  "prix_m2_median_appartement_yoy_pct": null,
  "prix_m2_median_maison": 3110,
  "prix_m2_median_maison_yoy_pct": 1
 },
 "series_annuelles": [
  {
   "annee": 2021,
   "apt": 3333,
   "apt_n": 3,
   "maison": 3286,
   "maison_n": 12
  },
  {
   "annee": 2022,
   "apt": 4277,
   "apt_n": 1,
   "maison": 3636,
   "maison_n": 17
  },
  {
   "annee": 2023,
   "apt": 3110,
   "apt_n": 3,
   "maison": 3110,
   "maison_n": 14
  },
  {
   "annee": 2024,
   "apt": 3089,
   "apt_n": 2,
   "maison": 3243,
   "maison_n": 16
  },
  {
   "annee": 2025,
   "apt": 3554,
   "apt_n": 8,
   "maison": 2950,
   "maison_n": 23
  }
 ],
 "tranches_surface": {
  "Appartement": [
   {
    "band": "< 30 m²",
    "median": 3752,
    "n": 3
   },
   {
    "band": "30-60 m²",
    "median": 3357,
    "n": 5
   },
   {
    "band": "60-90 m²",
    "median": 3128,
    "n": 2
   },
   {
    "band": "90-120 m²",
    "median": null,
    "n": 0
   },
   {
    "band": "120 m² et +",
    "median": null,
    "n": 0
   }
  ],
  "Maison": [
   {
    "band": "< 30 m²",
    "median": null,
    "n": 0
   },
   {
    "band": "30-60 m²",
    "median": 5521,
    "n": 2
   },
   {
    "band": "60-90 m²",
    "median": 3015,
    "n": 10
   },
   {
    "band": "90-120 m²",
    "median": 3131,
    "n": 16
   },
   {
    "band": "120 m² et +",
    "median": 2950,
    "n": 11
   }
  ]
 },
 "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/91243-fontenay-les-briis"
}