Ok let's end the debates.
Regarding the Nova Centre office space. I personally don't think that the Nova Centre has an overwhelming abundance of office space. It has been stated in the local media that the Nova Centre will have 1,200,000 square feet of new space. However, there was an article about a year or two ago (time goes by quickly) that gave the impression that the two levels of underground parking were being included in that calculation. The underground parking area is probably close to 200,000 square (based on the site dimensions x 2 levels).
The convention centre has slightly more than 300,000 gross square feet of space (that includes everything, hallways, lobbies, kitchens, washrooms, etc. - source -
https://conventioncentreinfo.com/about/overview/ ). It appears as though the hotel will have approximately 250,000 square feet (this is a guesstimate based on the lot size and number of storeys). There is also retail space which could be 100,000 square feet or so. Adding all these numbers up, I get 850K of space (including the parking space). So the remaining space, if office space, would be 350K square feet or so. The office space consists of a fairly slender 11-12 storey office tower on a large podium (14 storeys total), so it doesn't look like an excessive amount of office space.
Joe Ramia of Rank Inc. has stated in the past (in the media, and at an HRM televised meeting) that he would allocate some of the office space to residential if he didn't have sufficient office tenants lined up. So potentially the Nova Centre office space could only be 200K - 300K square feet (this is just my conjecture). This doesn't seem like an overwhelming amount as far as finding tenants goes. Some businesses will want to be associated with a convention centre that has an abundance of meeting rooms.
Having a hotel that is connected to a convention centre should make it easier to find a hotel operator. As far as parking goes, it is required downtown. Residential space in that area seems to be in demand (fairly close to Spring Garden Road). So Rank Inc. may not have too difficult of a time to find the necessary tenants (although 2 months seems like a very tight schedule to get all the commitments).