The 289,000-sf twin towers, sheathed in polished green slate, stand at the corner of Von Karman and Martin avenues in the county's pricey John Wayne Airport submarket. The 14-year-old building is almost fully leased.

The seller is Tokyo's Hyogo Atrium Inc. Hyogo chose Cornerstone's bid over more than a dozen competing offers, says Bob Smith, the broker and senior vice president in the Newport Beach office of CB Richard Ellis who helped to negotiate the sale.

Cornerstone is a large pension fund advisor based in Hartford, CT.

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