Trulia's Ralph McLaughlin reports that the share of million dollar homes in the United States has increased from 1.6% to 3% since 2012, but many metros and neighborhoods have seen a much larger increase.

San Francisco has seen the greatest increase in the share of million dollar homes in the U.S., growing to 57.4% in 2016 from 19.6% of homes in 2012. It’s followed by two other Bay Area metros, San Jose and Oakland.

The phenomenon is not limited to the SF Bay Area: metros in Southern California, Hawaii, and the Northeast have also seen noticeable gains, having nearly doubled the share of million dollar homes in just four years.

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