Westfield Marion is the eleventh largest shopping centre in Australia, with approximately 342 stores alongside anchor tenants including David Jones, Myer, Harris Scarfe, Target, Kmart, Big W, Woolworths, Coles, Event Cinemas, Aldi and Rebel Sport.

The office tower is located at the original mall where the food court is facing Diagonal Road.

The South Australia Aquatic and Leisure Centre is also a part of Westfield Marion; located on the northern side of the site after its opening in April 2011.

Westfield Marion was built in 1968 on a large expanse of land bordered by Sturt, Diagonal and Morphett Roads, and has seen extensions in 1982, 1989, 1997 and 2016.

Westfield Marion achieved major Australian firsts upon redevelopment in 1997 as the first shopping centre to have all three department stores present in South Australia at the time, (David Jones, Harris Scarfe and Myer) as well as all three discount department stores (Big W, Kmart and Target).