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 facility, but 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 could be given to Sioux Falls' WESTERN MALL, which was dedicated in October 1968.
Photo from www.aberdeenareahistory.org   

The regional-class shopping mall in 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. By 1978, WESTERN MALL housed around fifty-two stores and services and spanned approximately 400,000 leasable square feet.