Fort William City Hall, looks to be sometime in the 40s. It cost 5 Million dollars to built in 1903, when Fort William had only about 6,000 residents. Which is impressive to say the least. The dome on top was copper.
When Lakehead City Hall was being built (the name wasn't chosen yet), it was built behind the old city hall. Once it was completed, the old city hall was demolished. This way, they could stay in the building during construction, yet have the building on the same site. Port Arthur had a dedicated city hall until 189-something, when it burned down. Shortly after they used space in the Masonic Temple, then rented office space from a private office building until amalgamation.
Both of the above photos are from the Thunder Bay Historical Museum. Click on them to see their Flickr pages.
City hall today:

(my own photo)
This summer it will undergo renovations, the entire façade will be replaced with a newer material (something decent!) and an annex will be added to the front of the building. Our city hall only holds about a tenth of the city government. They also have offices occupying about 100,000sqft of Victoriaville Mall, about two thirds of the building in which Port Arthur's city hall was located, an annex across the street from city hall, and about a dozen other small buildings home to various city agencies. We probably have one of the most fractured city halls in the country.

Oh, and while the black things on city hall are light fixtures, they have never been used, as far as I know. I think they should be. Of course, who knows if they'll even still be there after the renovations. I worry that the annex will ruin the building. It's shape is a pretty good example of modernism. (It's materials, however, are shit.) I can't see how an annex would fit in to it.
And this is Sault Ste. Marie's civic centre: