PHOTO: ‘Real estate is not known to fit the other investment criteria millionaires prefer (simple, easy, etc), but there’s certainly something about it that draws them,” says John, who spent the past few years interviewing 100 millionaires. Rob Homer

At the end of the day, building wealth is relatively simple: Earn good money, save, and invest.

But there’s a fourth, additional step millionaires often take once that’s all said and done: Investing in real estate.

“Investing in real estate seems like a natural result once the basics are covered and excess cash is generated,” John – who retired early at the age of 52 with a $US3 million net worth and writes personal finance blog ESI Money – wrote in a blog post.