A new train station, light rail, ferry wharf, 350m-long beach and multiple towers all on a site less than 30 minutes from the Sydney CBD.

This is, in part, the vision of an unsolicited proposal-plus for the Rosehill Gardens Racecourse, a $25-billion private investment plan that triples the money spent on Barangaroo to add 45,000 homes and a riverside recreational space inspired by Brisbane’s South Bank.

In fact, it has the potential to propel the Parramatta river city past Sydney harbour city with its drawcard as a three-minute economic super-hub, proponents say.