Once I have selected the block, how do I read it's scale factor?
Edit:
I think I found what I was wanting
BlockReference myBRef = (BlockReference)tr.GetObject(acDb.BlockTableId, OpenMode.ForRead);
double ScaleX = myBRef.ScaleFactors.X;
double ScaleY = myBRef.ScaleFactors.Y;
double ScaleZ = myBRef.ScaleFactors.Z;