[Mininari]

It would be "hedging a bet" to build "Bentall 6" strong enough to support any additional floors. The bet being that one day, down the road, the people of Vancouver realize that potential of Downtown Vancouver will rest upon higher office densities, more job-space creation, etc.
Transit infrastructure converges on the downtown, and it would seem logical that to support sustainable regional development, one would want further job growth in areas serviced by rapid transit.

Hence: modify / eliminate the viewcones.

So many prime locations have already been developed (with condos), and taking down an existing building and replacing it with something new is costly (re: Grosvenor building, 600ft building st), it could be argued that a building be built to support additional floors above the height limit, for future development. I am willing to bet there is NO language in any guidelines that would restrict this.

A 500-525' Bentall 6 sure would compliment the Shangri-La, and 66-storey whatever-its-called-now.

Oh well, we can always pin some hope on that 'Amacon' tower thats disappeared from the rumor mill. There has to be demand for the space afterall!