Film screenings have been staged in its state-of-the-art theatre and dinners held in its grand ballroom, served by staff trained by the luxury Oberoi hotel chain.

But its owners return at the end of each party to their former ancestral home, never staying the night.

Vastu, a philosophy that guides Hindu temple architecture, emphasises the importance of facing the rising sun – and despite the staggering sum spent on Antilia the building’s eastern side does not have enough windows or other openings to let residents receive sufficient morning light.