With the footprint being so large and 2 stories, there is space for at least two distinct venues, if not three.
On the Rideau Side you have an established coffee shop, which could be converted to a full scale restaurant or brewery, removing part of the 2nd storey floor and creating a balcony/loft style area. Although we seem to have lots of these already.
On the Sussex side/coming in from Sussex and opening up to George (including the nasty loading dock), you already have an open floor plan where the escalators are situated. This can be revised and opened even more, rearranged into a small amphitheater or a balcony style for shows, with the stage and back of house areas along the north-east 'wing' where all the kitchy books and kindles were marketed from, and where the load-in area already is. A bar and kitchen where the checkout and Chapters back-of-house was already located. There's just a lot of potential dead space on the 2nd floor.
How about just pickleball courts?
Honestly the combination of Inside Edge and the NCC landlording these properties doesn't give me the warm and fuzzies. Their other forays into capital projects and being selective with tenants just administrates itself into a schleppy process that ends up in a heavy mess of taxpayer-borne cost and RFP requirements.
What the heck is wrong with the free market, that the government needs to strong arm themselves into our 'iconic' properties? Just butt out and let the free market reign. Although, we Ottawans have already proven that we can't carry a 2000 seat indie music venue on our own, we need the government help to carry the overhead cost, lol