Certainly.
I think one of the context pieces for this actual particular rehabilitation program is that the courtyards that are contained in the Centre Block are really exterior walls, so for a building of its size, which is already very large, you have a significantly higher percentage of exterior exposure. Right now we are pursuing a design solution that will actually close those courtyards, effectively making those exterior walls into interior walls. This will bring us significant gains along the sustainability spectrum as well as provide optionality in terms physical use of the space. It's a win-win situation in terms of that.
We have baselined the building and we're working very hard to be a flagship for sustainability and understand where we can push the envelopes as the design progresses forward. We're not there yet in terms of understanding exactly what technology we're going to be putting into the building and how that will relate to the broader campus, which also has a sustainability objective.