dwelling values rose by 5.8 per cent in sydney over the last quarter , the strongest increase since april 2009 .
the increase has brought the median house price to $ 690,000 in the harbour city .
sydney 's strong performance led the national dwelling value to heighten by 3 per cent .
canberra performed second best with a 4.1 per cent increase followed by melbourne at 3.5 per cent and $ 518,000 .