Prominent Modernists such as Ludwig Mies van der Rohe and I.M. Pei designed major works in Canada. At the same time top Canadian architects did much of their work abroad. One of the first and most prominent Modernist structures was Ludwig Mies van der Rohe's Toronto-Dominion Centre. The T-D Centre was one of the most prominent of the early glass and steel panelled office towers, which would be imitated around the world. The International Style period coincided with a major building boom in Canada, and few restrictions on massive building projects. International Style skyscrapers came to dominate many of Canada's major cities, especially Vancouver, Calgary, Edmonton, Ottawa, and Toronto. In Montreal fewer such buildings were erected, but those that were such as Place Ville-Marie and Place Victoria, were large enough to dominate the skyline.