Guercio was the founder of Caribou Ranch, a popular recording studio in Colorado's Rocky Mountains. The first radio hit recorded at Caribou was Joe Walsh's "Rocky Mountain Way". In addition to Chicago (starting with "Chicago VI"), the studio has been used by numerous other artists: Elton John (for his "Caribou" album as well as "Captain Fantastic and the Brown Dirt Cowboy" and "Rock of the Westies"), Dan Fogelberg, Return to Forever, Billy Joel, Rod Stewart, Carole King, Stephen Stills, Waylon Jennings, Amy Grant, Supertramp, Badfinger and The Beach Boys. Unfortunately, the studio complex was shut down and never used again after a March 1985 fire destroyed the control room and caused about $3 million in damage.