The Signature Tower is designed by Atkins Architects (UK). The tower design itself is not finalized, and isn't going to start until construction on most of the other buildings is underway, so it very well may be redesigned/finalized again.
The height of the tower is intentionally left open. Lanco Developers want it to have the 'tallest residential tower in the world' title, but according to
recent reports, the tower has initial aproval of 112 stories in height.
With the pointy design, and given the Indian standard of 3.5m/floor, this tower can well be over 400m high