 The plan was not endorsed by Parliament until 1973, by which time Morley Shopping Centre had expanded twice, in 1970 and 1973, and Karrinyup was one of three new shopping centres that were completed in "middle-distance" suburbs, locations outside the designated corridors; the other two were Westfield Carousel at Cannington and Garden City, Booragoon, established a year earlier in 1972.Construction of the larger centre began in April 1972, and on completion was expected by its developers, St. Martins Properties Pty Ltd, to become the biggest shopping centre in the state.The centre consisted of a number of features including grade separated access from the car parks to the centre over the main vehicle routes to reduce driver confusion, wide malls of terrazzo flooring, natural light provided through diffused roof lanterns, and enclosed air conditioned malls, the latter being considered unusual at the time by the local press.