According to sources, JP Morgan will no longer oversee $613m core portfolio. : Massachusetts Pension Reserves Investment Management Board (Mass PRIM) has ended a real estate separate account managed by JP Morgan Asset Management, according to sources. IPE Real Assets understands that Invesco Real Estate, which already looks after a $1.1bn (€969m) separate account behalf of Mass PRIM, will assume the management of most of the assets. One remaining asset, a three-building office at 125 High Street in Boston, owned in a partnership with Tishman Speyer, will now be managed internally by Mass PRIM.