Rustomjee Group s subsidiary, Kingmaker Developers, has acquired 100% equity and preference shares of DB Realty s subsidiary, Realgem Buildtech, for over Rs 231.42 crore. This acquisition paves the way for Rustomjee Group s listed entity, Keystone Realtors, to take over Rustomjee Crown, a premium residential project in Mumbai s Prabhadevi area.