Commerce Tower January 10, 2018 0 Facebook Twitter Google+ Pinterest WhatsApp The 30-story Commerce Tower was downtown's largest building when it opened in 1965. 911 Main St. | 355 apartments, 100,000 square feet commercial space | Cost: $139 million | Opened Fall 2017 Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window)MoreClick to share on Reddit (Opens in new window)Click to print (Opens in new window)Click to email a link to a friend (Opens in new window)