It appears that Britten Chicago, a showroom for a Michigan printing company, has moved out of 1420 S. Michigan judging by the signs in the windows:

While you never like to see businesses close up shop, we imagine many in and around the neighborhood aren't going to be that upset with this one.
For those of you looking for some background, here is a link to a post we did on Britten back in January of 2010.