What was South Dakota's first mall? Some might cite Aberdeen's SUPER CITY CENTER, which opened in April 1964. It was a fully-enclosed retail center. However, it was also quite small, encompassing only 138,000 square feet. Moreover, it didn't have an anchor store. Speaking regional-wise, the distinction of first mall in South Dakota should probably be given to Sioux Falls' WESTERN MALL, which was dedicated in October 1968.
Photo from www.aberdeenareahistory.org   

The regional mall is Sioux Falls was 10 years old by the time of this site plan. The original complex had been expanded with a second cinematic auditorium in 1974. In 1978, WESTERN MALL housed around fifty-two stores and services and contained approximately 400,000 leasable square feet.