It just occured to me, considering that they're building 5 floors for parking.
From the web site, we know that there are 124 condos in each tower, (3-32: 8, 33-39:6, 40:2), for a total of 248 condos.
If we go for a parking slot each, that 248 slots (we'll say 250).
The nearby CCE has 500 parking slots for the two towers, roughly the same size as the Rocka...
That would mean that at least half the parking lot should be available to the public.
My reasoning is that the owner of the former parking lot, is the one building the towers. And that they won't let go of the lucrative parking operation so close to the most occupied theatre (Centre Bell) in North America...
Oh, and here is this week pic: