The interior of the Ottawa Convention Centre is spread out over four levels. There are a number of meeting rooms, ranging from the sort of size suited for perhaps a couple dozen people to larger spaces for company conferences, meetings, or receptions. The largest space is Canada Hall, on the third level.
Canada Hall is big enough to fit a plane (as long as you assemble it, because that's the only way it's getting in here). It can accomodate six thousand people, and one can expect things like trade shows, large conferences, or political conventions in here. The Hall can be subdivided into smaller sections with retractable walls as needed.
Here work is being done in between trade shows. The benefit of living here is that one can take a peek inside the Convention Centre at leisure.