I'm reading "American Teen" and have this vague remembrance of another story where the MC finds out that he has extremely rich Grandparents.
I can't remember if the revelation comes via a death in the family or the reaching of a given age but, I think, the MC is flown to meet them. Grandparents have a penthouse but, if I'm remembering correctly, MC is housed elsewhere and discovers that it is being bugged, though not by the Grandparents.
Any suggestions?