Toronto City Hall was designed by the Finnish architect Viljo Revell, who won a 1958 international competition, with John B. Parkin Associates as local architect and Hannskarl Bandel as structural engineer. Construction began with a sod-turning on November 7, 1961, and it opened on September 13, 1965. The article gives the style as Neo-Expressionist Modern.
Two curved, asymmetric towers frame a saucer-shaped council chamber on a two-story podium. The structure is poured reinforced concrete, with precast panels inlaid with Botticino marble strips on the tower back walls. The east tower has 27 stories and the west 20, at 327 and 261 feet (99.7 and 79.6 m) in the infobox, and 99.5 and 79.4 m in the text.
The infobox gives CA$31 million, while the text cites a CA$18 million approval and a CA$24 million settled budget. It was designated under the Ontario Heritage Act in 1991, and the podium roof became a green roof in 2009.
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