With such an expansive landscape of cities across the United States, there’s no surprise that real estate development has reached great heights. In fact, many projects throughout America cost upwards of a billion dollars to complete. Here are some of the most expensive real estate developments throughout American history.

Center City, Las Vegas, Nevada

Situated on the Las Vegas Strip, the City Center’s development began in 2006. Opening three years later, the center currently boasts 16.7 million-square-feet of casinos, hotels, high-end retail destinations, and luxury condos. The construction was estimated to have cost about $8.5 billion.

Springwoods Village, Spring, Texas

Located 20 miles north of Houston, Springwoods Village is a master-planned development. While some of the planned residencies have already been established, other developments such as offices, retail spaces, and restaurants are still in the works. The first phase of the 2,000-acre development began in 2014, and the project is not estimated to be complete for another decade. When completed, it is estimated the construction will cost around $10 billion.

Hudson Yards, New York City, New York

Hudson Yards is set to open by 2024 and boasts the title as the largest private real estate development project in U.S. history. The neighborhood situated on Manhattan’s far west side is anticipated to include dozens of residencies, shops, buildings with cafes, bars, and a school. In addition to these developments, there will also be 14 public acres of outdoor space for the community. The neighborhood is said to cost around $20 billion.

The Rebuilding of the World Trade Center, New York City, New York

After the September 11 attacks in 2001, a development effort has been put in place to replace the destroyed World Trade Center buildings. The development includes seven buildings, with four of them—including three skyscrapers that contain mostly office spaces and a $4 billion transportation—have since been completed. While estimates for the development vary, 9/11 reports from The New York Times estimate the project is at least $8 billion in cost, not taking into account the price for replacing damaged property such as technology.