Question: What is the name of 27-storey mansion on Altamount Road that has a staff of 600 to maintain it?
Sentence (from "Altamount Road"): The road has been in the news in recent times because of the completed construction of the costliest home in the world, Antilia, a 27-storey mansion by the Indian industrialist, Mukesh Ambani.
Relevant evidence: Yes