SPECIAL REPORT: GREENSTONE SHOPPING MALL former AECI Modderfontein chemical factory. commercial and retail design is evident in the design of this award-winning mall. Owned by the Sasol Pension Fund, the mall Bentel Associates International whose extensive experience in is situated on a 21-hectare site in the southwestern corner of the 420 0 -hectare Greenstone Hill development on the site of the Greenstone Mall, which opened in 20 0 7, was designed by architects