Scottsdale, Ariz. — Thomas R. and Ruth Ann Hornaday of Paradise Valley, Arizona, have donated the Collaborative Research Building to Mayo Clinic. The 110,000-square-foot biomedical research facility, which opened on Mayo Clinic’s Scottsdale campus in 2005, is valued at $64.4 million. The Collaborative Research Building houses laboratory-based research activity at Mayo Clinic in Arizona. Mayo Clinic researchers, physicians and other investigators are leading the scientific discovery of the mechanisms of human disease, as well as…