Sydney is listed as one of the world 's fastest-growing cities for millionaires . Knight Frank survey revealed the world 's top 40 cities for rich dwellers . Comment: Sydney home to 764 UHNWIs in 2015 - the most of any Australian city .
Sydney is listed as one of the world 's fastest-growing cities for millionaires . Knight Frank survey revealed the world 's top 40 cities for rich dwellers . Ultra High Net Worth Individuals are defined as worth more than $ 30m . Sydney home to 764 UHNWIs in 2015 - the most of any Australian city .