paris france struggle socialist party say tuesday agree sell historic headquarter paris leave bank 45.5 million euros 53.89 million sting electoral defeat year leave strap cash mansion socialist hand since 1980 francois mitterrand become party first leader rise presidency sell french property developer apsys center-left party 29 parliamentary seat legislative election year 280 previously 577-strong chamber cause lose state subsidies socialists also suffer electoral drub presidential race may centrist newcomer emmanuel macron take power blow apart france traditional two-party system process center-left party candidate limp fifth place francois hollande whose election five years early hail new dawn french socialists seek re-election follow unpopular presidency center-left party across europe struggle win back voters wake recessions global bank crisis spawn new political party increase support case radical force leave macron upstart republic move party large number seat low house parliament fund sale socialist headquarter partly use future campaign party say would move next september socialists currently manage committee party due hold leadership contest next april french socialists sell historic headquarter 53 million