The office lobby is double height, it's just the retail that has a low ceiling.
probably due to a view cone limit for overall building height.
Office lobbies seem to be getting smaller and smaller sq ftage-wise,
in favour of retail space.
It was also sold as strata, so minimizing common areas and maximizing return.
Pics at KPF:
https://www.kpf.com/project/320-granville