Control feature layer drawing order

You can define a pane to control the order in which feature layers are drawn. This allows you more cartographic control over the rendering of layers beyond typical tile, polygon, and point ordering.
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<html>
  <head>
    <meta charset="utf-8" />
    <title>Control feature layer drawing order</title>
    <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no" />
    <link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css" crossorigin="" />
    <script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js" crossorigin=""></script>

    <!-- Load Esri Leaflet from CDN -->
    <script src="https://unpkg.com/esri-leaflet@3.0.10/dist/esri-leaflet.js"></script>

    <!-- Load Esri Leaflet Vector from CDN -->
    <script src="https://unpkg.com/esri-leaflet-vector@4.2.5/dist/esri-leaflet-vector.js" crossorigin=""></script>
    <style>
      html,
      body,
      #map {
        padding: 0;
        margin: 0;
        height: 100%;
        width: 100%;
        font-family: Arial, Helvetica, sans-serif;
        font-size: 14px;
        color: #323232;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <script>
      const accessToken = "YOUR_ACCESS_TOKEN";

      const map = L.map("map").setView([45.5384, -122.6695], 16);

      L.esri.Vector.vectorBasemapLayer("osm/standard", {
        token: accessToken
      }).addTo(map);

      const neighborhoodsUrl = "https://www.portlandmaps.com/arcgis/rest/services/Public/Zoning/MapServer/32";
      const buildingFootprintsUrl = "https://www.portlandmaps.com/arcgis/rest/services/Public/Basemap_Color_Buildings/MapServer/0";
      const blockPointsUrl = "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/0";

      // create a map pane for neighborhoods
      map.createPane("neighborhoods");

      // Define the created pane when creating the feature layer
      L.esri
        .featureLayer({
          url: neighborhoodsUrl,
          pane: "neighborhoods"
        })
        .addTo(map);

      // Panes are added to the map in order - this pane will be sit on top of 'neighborhoods'
      map.createPane("footprints");

      L.esri
        .featureLayer({
          url: buildingFootprintsUrl,
          pane: "footprints",
          style: function (feature) {
            return { color: "white", weight: 0, fillOpacity: 1 };
          }
        })
        .addTo(map);

      map.createPane("blockpoints");

      // for point GeoJSON, Leafet expects custom panes to be returned in pointToLayer()
      L.esri
        .featureLayer({
          url: blockPointsUrl,
          pointToLayer: function (geojson, latlng) {
            return L.circleMarker(latlng, {
              pane: "blockpoints",
              color: "green"
            });
          }
        })
        .addTo(map);
    </script>
  </body>
</html>