SINGAPORE - The en-bloc boom has prompted freehold Cairnhill Mansions to try to pull off a collective sale - its fifth attempt. It has won the backing of more than 80 per cent of the owners threshold and a public tender will soon be called, marketing agent CBRE said on Thursday (Oct 5). Home owners are hoping for at least $362 million for the prime 61-apartment property, which has a roughly 172,240...