(Save the date: RealShare Chicago comes to the Union League Club of Chicago October 23.)

CHICAGO-The Tribune Co. has hired the local office of Colliers International to find office tenants at its headquarters building, Tribune Tower, at 435 N. Michigan Ave. The exact number available is open for suggestion, Colliers’ Drew Nieman tells GlobeSt.com, but will start at more than 150,000 square feet.

He says that the media giant, which is still going through a bankruptcy started in December 2008, has said it will consolidate space at the 740,000-square-foot tower if a large tenant is interested in taking one or more of the large floor plates. “Since the dead time of 2008-2010 for office space in this submarket, including North Michigan Avenue, River North and the East Loop, we’ve started to see activity pick up again,” Nieman says. “You’re seeing movement especially by the technology companies, there’s a lot of discussion with Google looking for space.”