Just to show the 3x number is not fiction from a historical context here is three SoCal cities with high attractiveness to asians in 2000:
Diamond Bar
median household income (2000): $68,871
median house/condo price (2000): $245,800
Ratio: 3.56
Irvine
median household income (2000): $72,057
median house/condo price (2000): $316,800
Ratio: 4.39
San Marino
median household income (2000): $117,267
median house/condo price (2000): $690,800
Ratio: 5.89
Beverly Hills however looks extremely rich in house prices / income in 2000.
Beverly Hills
median household income (2000): $70,945
median house/condo price (2000): $1,000,001
Ratio: 14.09