The family-owned retail giant Dunnes Stores is set to close the acquisition of the site of the former Union Cafe in the south Dublin suburb of Mount Merrion, The Currency understands. When agents JLL put it on the market in July for €5.75 million, the property was the most valuable by asking price among the assets recently put up for sale by Paddy McKillen Jr’s Oakmount property business. Union Cafe was part of the Press Up hospitality group and later operated under the group’s Elephant & Castle brand until its owners closed it down last November, as planning permission, granted…