From Tribune... still not 100% of if there new or relocated from other buildings but recent article seems to assume that it could be moves possibly ...
"BMO Harris currently leases more than 800,000 square feet combined in three downtown buildings — at 115 S. LaSalle St., 111 W. Monroe St. and 200 W. Adams St. Some or all of those workers could be consolidated into the new Union Station space."
http://www.chicagotribune.com/busine...910-story.html