Cities don't create themselves. They are planned chaos. They are ongoing experiments that all urbanites take part in every day, experiments whose goal is to discover the magic alchemy that allows millions of people to live together safely, happily, and prosperously. 

One of the biggest roadblocks for millennials struggling to become adults is the exploding cost of owning a home, particularly in the places where they want to live: cities.

200,000 people migrate to cities daily around the world. Nearly 70 percent of the world will live in cities by 2050, closer to 90 percent in North America and Europe. 

The problem?