Mumbai-based Hiranandani Constructions is planing to raise $750 mn by selling shares next month in the biggest offering by an Indian developer on the London Stock Exchange (LSE), banking sources said.Hiranandani plans to sell shares in a property investment firm on the LSE's Alternative Investment Market, the two bankers said.HSBC Holdings Plc and Bear Stearns Cos will arrange the offering, the bankers said.Hiranandani joins Indian developers including K Raheja Corp and West Pioneer Properties in turning to London's AIM where rules for selling shares are less stringent than other exchanges.