There's one US metro where over half of homes cost $1 million - and it won't surprise you

Shutterstock / prochasson frederic

The million-dollar home is now commonplace in San Francisco.

Million-dollar homes are becoming the norm in San Francisco.

According to real-estate site Trulia, 57.4% of homes in the notoriously expensive Bay Area metro now have a value of $1 million or more.

In its recent report, Trulia looked at the share of million-dollar homes in the 100 largest US metro areas and how it's grown over the past four years. It defined a million-dollar home as any home - regardless of whether it's listed for sale - with a value of $1 million or more.

San Francisco saw one of the largest increases in share of seven-figure homes, going from 19.6% in May 2012 t0 57.4% in May 2016. That's a 193% increase.

Trulia also looked at which specific San Francisco neighborhoods have seen the largest increase in share: "While the neighborhood with the largest increase over the past four years is actually in the City of San Francisco - Westwood Park - the other four of the top five are in the small suburb of San Mateo, which is sandwiched between job-rich San Jose and San Francisco," the site wrote in its report.

You can get a better idea of the insane growth of million-dollar homes in the San Francisco area over the past four years by looking at this heat map:

Trulia