According to a post we read yesterday on Chicago Business:
Johnson Publishing Co. will move its headquarters a few blocks north to the top floors of the Borg-Warner skyscraper at 200 S. Michigan Ave.
So while they're just moving up the street, they're officially moving out of the Sloop (since they will be North of Congress).
We haven't read or heard much about Columbia's use for this building lately, so if you know something please chime in. Otherwise, we will keep our eyes open.