{
 "layers": [
  {
   "layerId": 0,
   "layerName": "Buildings Present",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "By 1959",
     "url": "73af9245a51c3493cb5baf17d59c1d3d",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAANUlEQVQ4jWPJy8v7z0BFwMLAwMDQHsNDFcMql3yBGEhNMGrgqIGjBo4aOGogkoGVS75QzUAAficHq+r8WpgAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      "NO,NO,YES"
     ]
    },
    {
     "label": "By 1938",
     "url": "ecf485adc6701dee8c6361a46c3c2733",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAANUlEQVQ4jWPJy8v7z0BFwMLAwMAQL/2DKoYtfMoBMZCaYNTAUQNHDRw1cNRAJAMXPuWgmoEAfbIHKLV+ZiMAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      "NO,YES,YES"
     ]
    },
    {
     "label": "By 1892",
     "url": "624042997f09dd2f7ab498680c2ccf86",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAANUlEQVQ4jWPJy8v7z0BFwMLAwMAgfe0aVQx7qqUFMZCaYNTAUQNHDRw1cNRAJAOfamlRzUAAfNUG04xqmy4AAAAASUVORK5CYII=",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      "YES,YES,YES"
     ]
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": ""
    }
   ]
  }
 ]
}