From the initial 12 bidders, the list has now been whittled down to just four. At the end of a competitive first round, for which "it wasn't even worth making a bid under €650 million," according to a market player familiar with the matter. Union Investment has reduced the list of potential buyers for the Paris Trocadéro business center to four names, Business Immo has learned from corroborating sources: the Americans Blackstone, Hines and Tishman Speyer, and the Norwegian sovereign wealth fund Norges Bank Investment Management.