The valuations for Bharti's tower business may be as high as his towers, but Sunil Mittal is hungry for more.That is why he has decided to go slow on the stake sale hoping that the delay will help him fetch a better price.Bharti wants to double its tower network to 80,000 before the hive-off and may also consider IPO for its tower business. Reliance Communications had sold five per cent in its tower business valuing the tower company at $6.7 billion.