Exelixis Inc., an Alameda, California, biotechnology company, is establishing a major hub in the Philadelphia area that involves eventually developing a 175,000- to 200,000-square-foot building and hiring several hundred new employees.  Referred to as Exelixis East by the company, Exelixis has a temporary base in 23,000 square feet at 640 Freedom Business Center Drive in… Read more »