[drew]

It's the atrium. That's really all that is required.

As optimus stated above (and we have all discussed on here numerous times before) you need to reduce the floor plate and add windows to make this building viable.

That should be enough to get the actual re-development of the Bay building going - before you even need to move over to the parkade - which is likely too valuable towards any redevelopment scheme to be demo'd anyway.