Mirvac has sold more than half of the 186 luxury apartments in a planned new 45-level building in riverside Melbourne, with overseas buyers making up 20 per cent of the sales, which benefited from state government stamp duty exemptions.

ASX-listed Mirvac revealed the sales figures on Monday, after a weekend in which it sold 150 apartments, out of a total planned 263, at its Harbourside development in central Sydney, where the state government has given no such exemption to buyers of off-the-plan apartments.