I was able to figure this out after a lot of research combined with trial and error. Here is how I was able to get the properties from the content/document type, I hope it helps if anyone else runs in to this!

@inherits UmbracoViewPage<Lecoati.LeBlender.Extension.Models.LeBlenderModel>

@{
  var item = Model.Items.ElementAt(0);
  var boxPicker = item.GetValue<string>("featureBoxPicker");

  if (!string.IsNullOrWhiteSpace(boxPicker))
  {
    var boxList = boxPicker.Split(new[] { "," }, StringSplitOptions.RemoveEmptyEntries).Select(int.Parse);
    var calloutBox = Umbraco.TypedContent(boxList);

    if (calloutBox != null)
    {    
      foreach (var piece in calloutBox)
      {
        var itemLink = piece.GetPropertyValue<dynamic>("itemLink");

        <div class="feature-box" style="background-image: url(@Umbraco.TypedMedia(piece.GetPropertyValue<string>("itemBgImg")).Url);">
          <div class="details">
            <i class="@piece.GetPropertyValue("itemIcon")"></i>
            <h3>@piece.GetPropertyValue("itemTitle")</h3>
            <p>@piece.GetPropertyValue("itemOverview")</p>
            <p><a href="@itemLink.url" target="@itemLink.target">Learn More</a></p>
          </div>
        </div>
      }
    }
  }
}