Neither Fortress Investment nor Blackacre have any connection with Soros. There is a Grove Partners LLP that Soros founded in 1999 but by the time of the project in question he was not involved in the decisions it made. It was managing his assets, not he managing it. But the article to which you link does not speak of Grove Partners LLP, but rather of Grove Capital LLP. George Soros has no connection with a firm named Grove Capital. There is a Grove Capital but it was founded in 1998 on the other end of the country from Soros, in San Francisco, not New York, and has no connection with Soros. So this article to which you link appears to be inaccurate. Further, as a mere one of three investors (and not the major one of the three) Grove Capital does not appear, by virtue of the investment, to have, in any case, led to interaction between Soros and Trump.