DeLong's Bar-B-Q Pit was a BBQ restaurant at 314 Detroit Street across from the Ann Arbor Farmers Market.  The Hot Trout sandwich was to die for.

DeLong's opened in 1964 in a former gas station, and closed in 2001. 

Michigan business registration

Photo, 1972:

DeLong's to close doors after 37 barbecue years, Ann Arbor District Library "Old News" collection. Ann Arbor News, July 24, 2001