And who needs that kind of noise?

The constantly think outside the box and come up with truly incredible solutions to complex problems. We USED to do things like this, unfortunately we have become complacent.

to consolidate, and thereby gain more control of their markets, the innovative minds were squeezed out. Innovation is expensive to implement and it cuts into profits. Once competition is no longer a factor, there is no need to go to that expense.

They're keeping the top few floors intact, and carefully taking out the stuff just beneath them, bit by bit - but that involves the jacks to support the top floors. Why not just dismantle, just as carefully, the top floor, then the one below it, etc., until they've got to the ground? That way, there'd be no need for the jacks.

On edit: explained here. Keeping the roof on keeps the noise and dust from the site down, and keeps the workers dry, allowing all work in all weather.

Just a few doors down from Tokyo Station, the 50-year-old landmark has been dismantled in favor of yet another steel-and-glass high-rise.