Facebook retained Cornerstone Earth Group, Inc. to provide environmental and geotechnical services for the development of an approximately 22-acre property, located at 1 Facebook Way. The approximately 433,000 square foot building, known as the world’s largest open-plan single room office with a 9-acre rooftop garden, was designed by Architect Frank Gehry, known for postmodern designs including the Walt Disney Concert Hall and the Guggenheim Museum.