At 219m tall - with an additional 40m of masts - the scheme will dwarf every other building in Italy, which is yet to see anything taller than 150m high.
The new designs have just been finalised and are a reworking of Piano's original scheme for what was then the San Paolo Bank.
Since merging with Intesa to form Italy's biggest bank, the scheme has become 'taller, wider and a little bit longer'. The original winter gardens which were to be cantilevered off the main tower have been reduced to a 'green staircase' running up the tower.
EE director Chris Wise said the tower would be 'home for 3,500 happy bank employees,' and added: 'It is a very green building as it has ventilated floors as well as a ventilated facade.
'A 364-seat public auditorium will be hung below the office floors' and public spaces and restaurants built at the top for the residents of Turin to dash up and enjoy the views of the Alps,' said Wise.
Completion is scheduled for 2011.