[onion2k]

It's important not to underestimate how many customers a store in a mall needs to survive. Most need tens of thousands of people to visit the mall every week in order to generate sufficient customers to have enough revenue to be viable businesses. Food-based businesses are a bit different because the same customers can visit every day, but you can't operate a hairdresser or a movie theatre by serving the same few hundred co-working space users every day if you have to pay the sort of costs it takes to run a store in a mall.

[Xylakant]

You're assuming that the economics that work for a mall would still work the same way when it's converted to "office space plus amenities". I know a few office buildings in Berlin that have a food court, barber shops/hairdressers, dry-cleaners etc. inside the building. And I doubt they're paying full price on the rent - they're advertised as amenities that make the office space more attractive, raising the price of the office space in the building.