The former AT&T tower covers an entire city block at 909 Chestnut St. in downtown St. Louis. It stands 44 stories and 588 feet tall with about 1.4 million square feet of space, making it the largest building in Missouri by area, according to .
Southwestern Bell built the tower in 1985 as its headquarters, and it was originally called One AT&T Center, per , which relied on reporting by the St. Louis Business Journal. The St. Louis firm HOK designed it, according to a Business Journal article quoted on …