public ParcelEditToken SetParcelHistoryRetired( 
   ParcelLayer parcelLayer,
   SelectionSet sourceFeatures,
   ParcelRecord parcelRecord
)

string errorMessage = await QueuedTask.Run(async () =>
{
  var myParcelFabricLayer = MapView.Active.Map.GetLayersAsFlattenedList().OfType<ParcelLayer>().FirstOrDefault();
  if (myParcelFabricLayer == null)
    return "Please add a parcel fabric to the map";
  try
  {
    FeatureLayer destPolygonL = null;
    //find the first layer that is a parcel type, is non-historic, and has a selection
    bool bFound = false;
    var ParcelTypesEnum = await myParcelFabricLayer.GetParcelTypeNamesAsync();
    foreach (FeatureLayer mapFeatLyr in MapView.Active.Map.GetLayersAsFlattenedList().OfType<FeatureLayer>())
    {
      foreach (string ParcelType in ParcelTypesEnum)
      {
        var layerEnum = await myParcelFabricLayer.GetParcelPolygonLayerByTypeNameAsync(ParcelType);
        foreach (FeatureLayer flyr in layerEnum)
        {
          if (flyr == mapFeatLyr)
          {
            bFound = mapFeatLyr.SelectionCount > 0;
            destPolygonL = mapFeatLyr;
            break;
          }
        }
        if (bFound) break;
      }
      if (bFound) break;
    }
    if (!bFound)
      return "Please select parcels to set as historic.";

    var theActiveRecord = myParcelFabricLayer.GetActiveRecord();
    if (theActiveRecord == null)
      return "There is no Active Record. Please set the active record and try again.";

    var ids = new List<long>(destPolygonL.GetSelection().GetObjectIDs());
    //can do multi layer selection but using single per code above
    var sourceFeatures = new Dictionary<MapMember, List<long>>();
    sourceFeatures.Add(destPolygonL, ids);
    var editOper = new EditOperation()
    {
      Name = "Set Parcels Historic",
      ProgressMessage = "Set Parcels Historic...",
      ShowModalMessageAfterFailure = true,
      SelectNewFeatures = true,
      SelectModifiedFeatures = false
    };
    editOper.SetParcelHistoryRetired(myParcelFabricLayer,
      SelectionSet.FromDictionary(sourceFeatures), theActiveRecord);
    if (!editOper.Execute())
      return editOper.ErrorMessage;
  }
  catch (Exception ex)
  {
    return ex.Message;
  }
  return "";
});
if (!string.IsNullOrEmpty(errorMessage))
  MessageBox.Show(errorMessage, "Set Parcels Historic.");