I agree there are lot of empty places but if u ask about it. u found its already fully booked to some compnies, there was some constrains to bring new emplyee during last year (due to Asian games) now most of company start bring the required staff. and the first thing they do rent full buiding (even before finishing).
After sometime when all underconstructing building will finished. i'm sure the offered places will be more and prices declining.