What kind of malls do you have in your area to have no natural light? Pretty much every mall I’ve ever been to has tons of skylights and rooftop windows.
That's generally only in the common areas, not in the retail spaces that make up the vast majority of the actual floorplan and where any converted offices would actually be.
Yeah but that could be redesigned. They could punch some holes in the external facing sides of the former retail stores and add some glass. They could add more skylights on the roof and funnel them down too.