Well, unofficially, that's halfway the business buildings in the Netherworld, to be honest, but I'm sure she means officially. In which case, that does narrow it down some. Did she mention the name of the building or the name or species of the hostess?
She... didn't say who her mother was, did she? I've heard... rumors that the great King Krichevskoy, in his youth, and before meeting his lovely wife, was rather... promiscuous? It's understandable, right? As the Overlord, various mademoiselles just couldn't get enough of him.