public Unit ZUnit {get; set;}

{
  // SpatialReferenceBuilder constructors need to run on the MCT.
  ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
  {
    // use the builder constructor
    using (SpatialReferenceBuilder srBuilder = new SpatialReferenceBuilder(3857))
    {
      // spatial reference builder properties
      int builderWkid = srBuilder.Wkid;
      string builderWkt = srBuilder.Wkt;
      string builderName = srBuilder.Name;

      double xyScale = srBuilder.XYScale;
      double xyTolerance = srBuilder.XYTolerance;
      double xyResolution = srBuilder.XYResolution;
      Unit unit = srBuilder.Unit;

      double zScale = srBuilder.ZScale;
      double zTolerance = srBuilder.ZTolerance;
      Unit zUnit = srBuilder.ZUnit;

      double mScale = srBuilder.MScale;
      double mTolerance = srBuilder.MTolerance;

      double falseX = srBuilder.FalseX;
      double falseY = srBuilder.FalseY;
      double falseZ = srBuilder.FalseZ;
      double falseM = srBuilder.FalseM;

      // get the spatial reference
      SpatialReference sr3857 = srBuilder.ToSpatialReference();

      // spatial reference properties
      int srWkid = sr3857.Wkid;
      string srWkt = sr3857.Wkt;
      string srName = sr3857.Name;

      xyScale = sr3857.XYScale;
      xyTolerance = sr3857.XYTolerance;
      xyResolution = sr3857.XYResolution;
      unit = sr3857.Unit;

      zScale = sr3857.ZScale;
      zTolerance = sr3857.ZTolerance;
      zUnit = sr3857.ZUnit;

      mScale = sr3857.MScale;
      mTolerance = sr3857.MTolerance;

      falseX = sr3857.FalseX;
      falseY = sr3857.FalseY;
      falseZ = sr3857.FalseZ;
      falseM = sr3857.FalseM;

      bool hasVcs = sr3857.HasVcs;
    }
  });
}