There are five regions across Canada, and each of them has a treatment centre building. The one in Saskatoon was built in 1981-82, and the one in the Pacific region was built in the late 1990s. The one I work in was built in the 1860s and it was renovated, to some extent, in 1990.
I haven't seen the ones in Quebec and Atlantic region, but the Atlantic region treatment centre is a wing of Dorchester Institution, which is also a very old maximum security prison. I'm not sure about the one in Quebec.
There's a lot of variation across the country in terms of what the facilities are like. I worked in the one in Saskatoon in the late 1980s, and it's a beautiful building. It looks like a modern hospital.