St. Louis Skyline Transformation; Class A Office Re-imagined Introducing The Beacon on Chestnut, a 1.2 million square feet redevelopment of the former AT&T Tower. The iconic 44-story building in the heart of downtown St. Louis represents a phenomenal opportunity for office users seeking to re-imagine the workplace experience for their employees, clients, visitors and guests all inside an amenity rich vertical city. With up to 300,000 SF of available office space for lease, including building signage for the major anchor office tenant, the Beacon will be the premier destination to Live, Work & Play in St. Louis.