JPMorgan Asset Management reportedly paid more than $550 million in cash to acquire a stake in River Oaks District, a luxury mixed-use development that opened last fall, sources told the Houston Chronicle. California-based developer OliverMcMillan still has an ownership stake in the project and a management role in the partnership with JPMorgan, the Chronicle reports. Both OliverMcMillan and JPMorgan declined to comment to the Chronicle. Boston-based hedge fund Baupost Group was part of the selling...