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May 01, 2008

While visiting New York in 2005, Nita Ambani was in the spa at the Mandarin Oriental New York, overlooking Central Park. The contemporary Asian interiors struck her just so, and prompted her to inquire about the designer.

Nita Ambani was no ordinary tourist. She is married to Mukesh Ambani, head of Mumbai-based petrochemical giant Reliance Industries [Get Quote], and the fifth richest man in the world. (Lakshmi Mittal, ranked fourth, is an Indian citizen, but a resident of the UK)

In pictures:
Mukesh Ambani's billion-dollar home
Homes of the billionaires

Forbes estimated Ambani's net worth at $43 billion in March. Reliance Industries was founded by Mukesh's father, Dhirubhai Ambani, in 1966, and is India's most valuable firm by market capitalization. The couple, who have three children, currently live in a 22-story Mumbai tower that the family has spent years remodeling to meet its needs.

Like many families with the means to do so, the Ambanis wanted to build a custom home. They consulted with architecture firms Perkins + Will and Hirsch Bedner Associates, the designers behind the Mandarin Oriental, based in Dallas and Los Angeles, respectively.

Plans were then drawn up for what will be the world's largest and most expensive home: a 27-story skyscraper in downtown Mumbai with a cost nearing $2 billion, says Thomas Johnson, director of marketing at Hirsch Bedner Associates.

The architects and designers are creating as they go, altering floor plans, design elements and concepts as the building is constructed.

In pictures:
World's most expensive homes 2007
What $1 million buys in homes worldwide

The only remotely comparable high-rise property currently on the market is the $70 million triplex penthouse at the Pierre Hotel in New York, designed to resemble a French chateau, and climbing 525 feet in the air. When the Ambani residence is finished in January, completing a four-year process, it will be 550 feet high with 400,000 square feet of interior space.

The home will cost more than a hotel or high-rise of similar size because of its custom measurements and fittings: A hotel or condominium has a common layout, replicated on every floor, and uses the same materials throughout the building (such as door handles, floors, lamps and window treatments).

The Ambani home, called Antilla, differs in that no two floors are alike in either plans or materials used. At the request of Nita Ambani, say the designers, if a metal, wood or crystal is part of the ninth-floor design, it shouldn't be used on the eleventh floor, for example. The idea is to blend styles and architectural elements so spaces give the feel of consistency, but without repetition.