Two major property deals unveiled this Thursday morning reveal the contrasting fortunes of US investment firms betting on Dublin’s residential and commercial markets in recent years. The sale of Lone Star’s Quintain Development Ireland, along with most of its home-building developments, and the reported disposal of the Blanchardstown shopping centre by Goldman Sachs offer an indication of the returns achieved in recent years. The Quintain transaction, described by the company as a “€200 million deal”, involves the sale of three residential development complexes in Portmarnock, Adamstown, and Clonburris, along with the developer’s business and continuing management team, to San Francisco-based…