Here are some options depending on the context:
If you're referring to a toilet on a lower floor:
* Toilet du rez-de-chaussée: This literally translates to "toilet on the ground floor".
* Toilet en bas: This means "toilet downstairs".
* Toilettes du bas: This means "toilets downstairs" (plural).
If you're talking about a separate toilet, regardless of its location:
* Toilettes séparées: This means "separate toilets".
If you're describing a toilet that is not attached to a bathroom:
* Toilettes indépendantes: This means "independent toilets".
If you're talking about a toilet in a specific room:
* Toilettes dans la salle à manger: This means "toilet in the dining room".
It's best to provide more context so I can give you the most accurate translation.