Blackstone raised $83.1bn alone in past 10 years. : Capital concentration in the private real estate fund sector has reached unprecedented levels, with just five managers responsible for the 20 largest funds closed in the past 10 years, a new report reveals. Alternatives data firm Preqin said that, in the past decade, the 100 largest private real estate fund managers had collectively secured 62% of all fundraising for the asset class.