since the mall's opening in 1966, glenbrook has been expanded and/or renovated five times. these expansions and renovations occurred in 1976, 1981, 1990, 1994, and 1998; with the 1976, 1981, and 1998 renovations also being major expansions. glenbrook square annually receives over 15 million visitors, and is the only enclosed super-regional mall in northeast indiana. based on leasable square feet, glenbrook square is also one of the three largest malls in the state of indiana along with castleton square in indianapolis and southlake mall in merrillville. in total, glenbrook square has a gross leasable area of .