8 of the most expensive real estate developments in American history

With an estimated cost of $20 billion, New York City's Hudson Yards neighborhood is set to become the most expensive private real estate development in American history.

When construction is complete in 2024, it will include all types of buildings, from luxury condos to boutiques to offices.

Elsewhere in the US, there are several similar projects - some of which cost billions.

Take a look at a few below.