Item 2. Properties

As of December 31, 2015, we had approximately 120 offices located in approximately 60 countries. Our executive headquarters is located adjacent to Research Triangle Park, North Carolina. We maintain substantial offices serving Product Development in Durham, North Carolina; Marietta, Georgia; Overland Park, Kansas; Reading, England; West Lothian, Scotland; Centurion, South Africa; Tokyo, Japan; Bangalore, India; and Singapore. We also maintain substantial offices serving Integrated Healthcare Services in Parsippany, New Jersey; Mannheim, Germany; Reading, England; and Tokyo, Japan. We own facilities in Gotemba City, Japan (currently unused and held for sale) and Barcelona, Spain that serve Product Development and Integrated Healthcare Services. All of our other offices are leased. None of our leases is individually material to our business operations. Many of our leases have an option to renew, and we believe that we will be able to successfully renew expiring leases on terms satisfactory to us. We believe that our facilities are adequate for our operations and that suitable additional space will be available if needed.