Thanks again for the question. Perhaps I'll start off, and then maybe I can hand it over to the architects.
No decisions have been made at this point on how to seismically retrofit the Centre Block. What I will say is that in all of the projects we've undertaken over the past decade, including the Wellington Building, the West Block, as you've referenced, and the Government Conference Centre, seismic retrofitting or seismic upgrading to meet modern building codes has been a key element of the project.
In the West Block, it is a stone masonry. It's a load-bearing stone masonry building that is different from the Centre Block. The Centre Block is one of the first steel structure or steel frame buildings, so the stone is more of a facade. It's a different type of building. The Wellington Building and the Government Conference Centre were different buildings again.
In the case of the West Block, we used approximately 10,000 seismic reinforcing bars to ensure that the three layers of the wall would respond in a harmonious way during a seismic event. In the Government Conference Centre, new shear walls, stairwells and elevator shafts were primarily used for seismic reinforcing. Again, it will probably be a different approach for the Centre Block, because it is a different building.