{
  "option": "Proposed rear-wall stair; prior verified side option retained",
  "checks": {
    "actual_mesh_no_unintended_building_collisions": true,
    "two_straight_parallel_opposing_flights": true,
    "flights_run_toward_and_away_from_main_wall": true,
    "flights_landings_behind_reflection_deck": true,
    "half_height_shared_return": true,
    "rise_13ft": true,
    "ledger_location_matches_modeled_solid_wall": true,
    "downloadable_glb_geometry_matches": true,
    "grading_pad_below_bottom_landing": true
  },
  "measurements_ft": {
    "minimum_behind_reflection_deck_gap": 3.504373000000001,
    "top": 12.0,
    "return_landing": 5.5,
    "bottom": -1.0,
    "story_rise": 13.0,
    "flight_width": 5,
    "flight_run": 11,
    "rear_gate_width": 6
  },
  "wall_connection": {
    "location_verified_in_model": true,
    "structural_load_capacity_verified": false,
    "new_wall_openings_proposed": false
  },
  "ground_path_sf": 450,
  "prior_ground_path_sf": 179.132075,
  "grading_assumption": "80 SF lowered pad under lower flight and bottom landing, elevation -1.08 ft. Existing model grade is higher; civil grading/drainage design is required.",
  "physical_collision_exclusion": "Only named CONCEPT wall ledger/anchor plates intentionally enter the wall. No walking surface penetrates a room.",
  "glb_max_vertex_error_m": 4.6185302693402264e-07,
  "mesh_part_count": 4058
}