Malls could be the best co-working offices. Ample daytime parking, baller food courts, medical facilities, hair dressers, dentists, cafes, movie theaters, entertainment, etc all under one roof.
Malls as coworking space would be literally the arcologies of dystopian cyberpunk. No windows, no natural light, never going outside in the real, natural world. Just one giant homogenised hermetically sealed world. It wouldn't be "best" for many people. Maybe "convenient" for bosses who don't like how much productivity they lose when a Meat Flavoured Productivity Unit has to go get a haircut or imbibe sustenance....
Being able to go for a climate-controlled one-kilometer walk every lunch break is a real luxury for a lot of people, it's way better than a cell in some high-rise near the highway. The mall could have a hackerspace too!
It has potential.