Thank you for the question.
Maybe I'll pass the details over to the architectural team.
For the West Block, I would say that for buildings of this vintage it's not uncommon at all to run into that issue. It's a common issue.
One thing that we've done on the Centre Block to reduce risk on a go-forward basis is to create a building information model. It's a 3-D model of the building, which is really going to facilitate the design work, help the functional programming work and could be a great tool to make visual presentations to parliamentarians about how the building could work in the future. It will also have a great benefit for operations when it comes back online as well.
Of course with the West Block, we've taken great care to ensure that we've not repeated some of the issues of the past, on a go-forward basis.
I'll hand it over to the architectural team to add any more details.