Area of the hotel that is generally off limits to guests (e.g kitchens, offices, storage etc.)

 “back stage” or behind the scenes; everything that you and your guests do not (and should not) see

Is a term used for a list of guests who are no longer welcome at a hotel, due to previous bad behaviour or indiscretions. Also refer to 'Red Alert'.

support areas behind scenes in hotel or motel including general housekeeping functions.

The part of a restaurant etc. not open to the public.