Driver's Toilets in a Core & Shell Building

Hi, We are working on a luxurious Core & Shell Residential Building. The future tenants will decide on the water fixtures for their own flats/apartments. However, there will also be toilets in basement levels that can only be used by the drivers of future tenants. The fixtures of these toilets will be specified by the current design team. Should we consider these toilets as Private or Public ? The drivers will need a key to access these toilets, and we therefore think they should be considered as private. I would appreciate your feedback on the above,