The Shenzhen stock exchange scheme in China, designed by international practice OMA, has topped out at 246m.
The building features the largest cantilevers in the world, with a raised podium suspended 36m above a public plaza and 54m from the tower base.
The three-storey floating podium has been built using 27,000t of steel.
Façade work has begun on the tower's 46 floors. The building is scheduled for completion in August 2011.