As impossible as it may sound, Frank Lloyd Wright is credited as the architect of over 532 structures throughout the world. His refusal to retire, even at the end of his life at 91, led to the design of some of his most beloved works, including the Solomon R. Guggenheim Museum, Price Tower, and the Marin County Civic Center. On September 19, it was announced that a sale through Heritage Auctions will be held for the Norman Lykes House, the very last building Wright ever designed.

On a rocky desert bluff at the edge of Arizona’s Phoenix Mountain Preserve, the Norman Lykes House—also known as the Circular Sun House—represents a culmination of so many of Wright’s signature design gestures: it is airy and curvilinear like his later works, yet it is also long and low to the ground akin to his earlier Prairie homes. It is reportedly only one of fourteen circular homes the architect designed, and might be the only one to feature a crescent-shaped pool enclosed by a cylindrical wall punctured by circles. Smooth concrete blocks and built-in handcrafted Philippine mahogany furniture constitutes the majority of the home’s material palette. “It’s not just that it’s a Frank Lloyd Wright home that makes it sellable,” said Jack Luciano, a partner with the Heritage Agency, “but that it’s a Frank Lloyd Wright house that is livable.”

Wright designed the home in 1959 for clients Norman and Amy Lykes, and his apprentice John Rattenbury was appointed to oversee the project during its eight years of construction. In 1994, Rattenbury was invited back to the home to oversee major changes, including the enlargement of the master bedroom (which reduced the number of bedrooms from five to three) and the conversion of its former workshop into a home theatre.

Though there will be no minimum bid set on the property, it is expected to exceed its most recent purchase of $2.6 million. The winner of the 3,100-square-foot home will also receive all of Wright’s furniture currently on the property. “We want to make sure the person that buys this house maintains the integrity of the home, remodels it, keeps it and loves it just like the former two owners have,” said Luciano. Interested buyers and agents can attend the auction within the home on October 16.