In 1911, James Herbert Simpson built a house on 40 acres by the river which, because of its shape, became known as the Castle on the Hill. Simpson named it Mount Pleasant, the name which now adorns the suburb. Mount Pleasant, like its neighbouring suburbs, experienced boom times after the completion of the Kwinana Freeway from Perth to the Canning Bridge which made the suburb, being so close to the City centre, and having attractive river views, extremely desirable real estate.

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