AT+T Center

Just five feet taller than the tallest building in St. Louis, the AT+T center is the second tallest in the city at 588 feet and 44 stories. It is, however, the largest building in St. Louis in floor area at 1.4M square feet - and currently completely vacant since AT+T moved 4500 employees to other facilities in 2014. Constructed in 1986, it was the tallest building in St. Louis until 1989, when One Metropolitan Square - the fourth stop on the tour - was completed. It is five feet shorter than the Gateway Arch!