{
  "property_id": "DEMO-001",
  "usable_area_m2": 140,
  "construction_year": "1965_1974",
  "number_of_occupants": 3,
  "construction_type": "heavy",
  "building_category": "single_family_building",
  "is_insulated": false,
  "are_windows_doors_replaced": false,
  "current_central_heating_source": "coal_boiler",
  "current_hot_water_source": "coal_boiler",
  "current_hourly_breaks": "no_breaks",
  "current_weekly_breaks": "7_days",
  "current_ventilation_type": "natural",
  "is_insulation_planned": false,
  "windows_doors_replacement_planned": false,
  "is_heat_replacement_planned": false,
  "is_planned_thermal_collectors": false,
  "price_standard": "medium"
}