I started my career buying and owning single-family houses, and I know that's a really tough job. Toilets break. Trees fall. There are so many things that can go wrong. Land, on the other hand, is cheap to manage. It's painless, really. All you have to do is pay your taxes, and that's it.

The annual 'Forbes' Billionaires List speaks volumes about the movement and concentration of wealth across industries and geographies.

Whether an economic boom is fueled by the fashion industry or technology innovations, it needs a brick-and-mortar foundation. This is not only true in New York and San Francisco; wherever you live, you can find a local hotspot positioned to attract interest from businesses, consumers and investors.

Perhaps the secret to making a billion dollars in real estate is that there is no secret.