CARROLLTON, TEXAS — AmerisourceBergen Specialty Group has completed negotiations for a 300,000-square-foot office lease in Carrollton. The corporate campus will be the largest build-to-suit office campus at the Offices of Austin Ranch and will serve as AmerisourceBergen’s regional headquarters. JLL’s Jeff Staubach, Greg Biggs, Torrey Littlejohn and Chase Monroe negotiated the lease on behalf of AmerisourceBergen, an American drug wholesale company. Billingsley’s Marijke Lantz represented the landlord. AmerisourceBergen joins Freddie Mac, Quest, Sanyo, Orthofix and Edward Don at the 1,700-acre master-planned development.