The Blackstone Group L.P. (NYSE:BX) has filed a formal bid to buy a minority stake in K Raheja Corp. Private Limited. K Raheja Corp. plans to raise $250 million by divesting around 15% stake in the rent-yielding office space assets that operate under the brand Mindspace. Other bidders for stake include Temasek Holdings (Private) Limited and Warburg Pincus LLC. Temasek is in the pole position but Blackstone and Warburg Pincus are strong contenders.