March 31 (Reuters) - SoftBank Group Corp backed Compass Inc has downsized its initial public offering in the United States, the real estate brokerage said in a filing on Wednesday. The company said it would now look to raise up to $475 million in the offering, down from up to $936 million it was aiming for earlier. (Reporting by Niket Nishant in Bengaluru; Editing by Shinjini Ganguli)