{
 "interior_layout_exposed": false,
 "legend_entries": [
  "ROOFTOP ROOM",
  "IRON DOOR",
  "EXTERIOR WINDOWS",
  "INNER DOORWAYS",
  "ROOFTOP TERRACE",
  "LOW WALL",
  "ROOF FIXTURES",
  "EXTERIOR STAIR",
  "ALLEY APPROACH",
  "NEIGHBOR ROOFS"
 ],
 "letters_found": [
  "A",
  "B",
  "C",
  "D",
  "E",
  "F",
  "G",
  "H",
  "I",
  "J"
 ],
 "notes": "Circled letters A through J are visible. No interior room layout or partition plan is exposed; the sketch shows rooftop/site elements."
}