Tokyo's Skytree soars 634 metres (2,080 ... Guinness World Records says it defines a tower as a structure in which less than 50 per cent of the total height is useable floor space. The world's tallest ...

The new building will have 63 stories above ground, and its total floor space will be roughly ... be more than 350 meters high--taller than Tokyo Tower. A luxury hotel will take up the upper ...