Sometimes malls are converted to office space. According to the documentary, Making of Riven, Cyan repurposed a strip mall as office space while they were waiting for the construction of a real office. They originally started out in some guy's garage after finishing Myst and crammed 12 people in there, then moved into the strip mall -- which they said was "like heaven" by comparison, but they didn't just stay in the strip mall because it was still too small for all the staff they wanted to bring on.