NetsDaily, drawing on Sports Business Journal's paywalled report, tells us Bruce Ratner selling majority share in Barclays Center. And while the publication did not report the projected sales price, it suggested that the arena's worth $750 million based on revenue flow, with Ratner's 55% share (part of a consortium with about 100 other investors) valued at a little more than $400 million.
In the first year, arena revenues were well below the expected figure, though they improved in the second year. The advent of the Islanders in 2015 should deliver a steadier revenue flow, even if concerts diminish.
So it's curious that the arena's for sale; perhaps Forest City recognizes that the upside from the Islanders is most available now, or perhaps Cleveland has decreed it. But Ratner has called the arena "fortress real estate," meaning it's something that can't be easily duplicated.
If Prokhorov controls the arena, that would mean that foreign owners control all of Atlantic Yards. (Update: Yes, as the commenter points out, except for B2. But I wouldn't be surprise to see the Greenland Group take a share.)