Land under Barry Diller’s IAC HQ up for sale

If the $260 million park floating above the Hudson River is “Diller Island,” then the Frank Gehry-designed IAC headquarters in West Chelsea is the Barry Diller mainland. And now a piece of Diller nation is up for grabs. The family that owns the land underneath the IAC office building at 555 West 18th Street has put the property up for sale, The Real Deal has learned. The Resnicoff family ground-leased the site in 2004 to