Competition Commission of India approved Blackstone's acquisition of Pune-based realtor Kolte-Patil Developers Ltd.Blackstone entity to acquire 26% stake for Rs 759 crore after acquiring 14.3% stake earlier through a preferential allotment route.The acquisition allows Blackstone to expand into the residential rental business in India.Kolte-Patil's strong presence in Pune, Mumbai, and Bengaluru will help in transitioning to student and rental housing for the IT workforce.