The flood of capital across borders looking for commercial property shows no sign of abating, with $US407 billion ($561.4 billion) of deals struck worldwide during the first half of 2015, up 14 per cent, property agency CBRE says.

That made the first-half the strongest since 2007. And Australia was in the thick of it, as the fifth-most-popular market, with offshore investors snapping up $US10.3 billion worth of sales. CBRE says Sydney ranked fourth on the list of targeted cities behind London, New York and Paris, while Melbourne ranked sixth.