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A Mumbai lane, where India's richest person Mukesh Ambani is building a $2-billion home, has joined the league of the world's 10 most expensive streets, but is outranked by over three-times costlier London's Billionaires Row where steel tycoon Lakshmi Mittal owns three houses. Altamount Road in India's financial capital Mumbai has been named as the 10th costliest in a survey, while London's Kensington Palace Gardens has been ranked at the fourth place Click Here @ TOP TEN