MUMBAI, Feb. 7 -- Uday Kotak, former managing director and chief executive officer of Kotak Mahindra Bank, and his family have purchased 12 flats in Shiv Sagar building at the Worli Seaface, for a record Rs.2.72 lakh per square foot, setting a new high in Mumbai's residential real estate market. The Kotak family has purchased the flats for Rs.201.89 crore, according to documents accessed by HT....