Blackstone, Bain Capital, Warburg Pincus and others are preparing final bids for the sale of Sankei Building, the core real estate subsidiary being divested by Fuji Media Holdings, according to multiple people familiar with the matter who spoke to Reuters. The deal, including debt, could reach around 1 trillion yen, and if completed would rank among the largest acquisitions in Japan's real estate industry. Besides the three firms, BGO, a real estate investment fund under Canadian insurance giant Sun Life, is also preparing and is expected to submit a binding final proposal by the end of October. Fuji HD is expected to scrutinize the proposals, select a preferred negotiator, and then seek shareholder approval for the terms. Meanwhile, Singapore-based investment fund Vasant Master Fund, in a letter dated September 30 addressed to President Kenji Shimizu, demanded more detailed disclosure on the valuation of Sankei Building's assets, the transaction structure, consideration of alternatives, and the use of sale proceeds.