Developers have had little luck with the 19 acres surrounding the protected period mansion Chesterfield House in Blackrock since the Celtic Tiger builder Myles Crofton snapped up the land in 2004.  As the crash came, Crofton’s development plans for the site fell through, debts grew and lender Ulster Bank moved in. The loans were sold to Cairn Homes and Lone Star as part of the €500 million Project Clear portfolio.  Cairn has major plans for an apartment complex on the site. Apartments are at the centre of the developer’s strategy. While they are generally riskier ventures than houses – they…