The Kelsey-Seybold administration building, 11511 Shadow Creek Parkway, Pearland, opened five years ago on Aug. 31. The medical provider has more than 2,400 employees, with 850 based in the Pearland office, which includes staff in human resources, accounting and finance, legal, marketing and business development, a contact center, clinical education and the KelseyCare advantage program, which marked 10 years this year.