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Hassell is a multidisciplinary architecture, design and urban planning practice with offices in Australia, China, Singapore, and the United Kingdom. Founded in 1937/8 in Adelaide, South Australia, the firm's former names include Claridge, Hassell and McConnell; Hassell, McConnell and Partners; and Hassell and Partners Pty. Ltd. They are particularly known for the Adelaide Festival Centre complex, which opened in 1973.