At this point they are expecting to open the ZLCC in mid-October.  Until then you should be aware of some changes in their hours. Through July 31st, they will be open Tues-Fri 9-4 and Mondays by appointment only.  Beginning August 1st, no walk-in research will be possible until the new building opens, but you can still access some materials by appointment (call (269) 387-8490).  As you might anticipate, some collections will probably be unavailable during the move so try to get your research trip in before the end of July.