EXACTLY five years after a company headed by property developer Francis Rhatigan sold the six-storey Gardner House office block at South Mall in Cork for €9.7 million, the investment is back on the market at around €4 million. The 1,624sq m (17,480sq ft) building is producing a rent of €313,200 and, according to Lisney, would show an initial yield of 7.75 per cent. One floor is vacant.