Mr. Chair, answering this would be speculation on my part at this point, the reason being that the complexity of the work means that we have a significant component of the activity that is a planning component, and that allows us to look at all the pieces of it. Going to five-year programs of work allows us to get more precision in terms of what the requirements are, the requirements of our parliamentary partners, and how we can best answer them.
We are addressing the most urgent work. For example, Centre Block, the building we're in right now, is expected to be in critical risk of failure for the building systems in 2019, so everything we are doing right now and the sequencing of the work that is being completed gradually is to allow us to empty Centre Block before that date. The planning for Centre Block is under way, but I don't have any precision right now as to how much it would cost.
It's the same thing for the East Block. We are going ahead with the most urgent work for the 1867 wing, but we know that there is more work that will be required for the building systems and for the interior walls. That will only happen after we finish the work on the Centre Block, because we have studies that show that the building systems can be sustained until 2030.