McKesson will purchase an existing 525,000 square foot office building in Irving for the expansion. The Dallas Business Journal also noted the company seeks to hire professionals for technology, finance and accounting, purchasing and program management positions, among other related jobs. The Irving facility will be in addition to McKesson's specialty pharmaceutical business headquartered in The Woodlands, Texas. McKesson has over 70,000 employees worldwide, of which more than 3,700 work at multiple locations in Texas. Presently, 900 of McKesson's employees work for the company in North Texas. Follow Merrill Hope on Twitter @OutOfTheBoxMom.