Mukesh Ambani, the 49-year-old Indian tycoon, former petrol pump attendant, whose personal fortune was put at nearly £31billion (about $62 billion), is the world's richest man overtaken Bill Gates in the rich list.
His mansion in Bombay will be 60 storeys tall, but will only have 27 floors to allow for super-high ceilings on the floors occupied by himself, wife Nita, and their three children.
There will be accommodation for 600 personal servants and staff.
Mr Ambani runs Reliance Industries, India's second-largest firm. The oil, textiles and chemicals giant was founded by his father, Dhirubhai, who started work as a petrol pump attendant.
His new pad will also include a helipad, health club, hanging gardens and six floors of car parking.
Construction has already started on what will eventually be a 175m tower and planners are aiming to complete it by September next year.
The building, already worth £500 million, could start a rush on skyscrapers.