Buy-to-let landlords are staging a dash to remortgage as interest rates fall but the recent mini-boom property investment is running out of steam, new figures show. The number of buy-to-let mortgages taken out in the first three months of the year was up 4 per cent annually, according to the latest Council of Mortgage Lenders statistics. In the same period last year buy-to-let mortgages were growing at 30 per cent annually, however, the rapid pace began to tail off last summer. Buy-to-let mortgage advances: The pace of the rise in the number of new buy-to-let mortgages being advanced has slowed, CML figures show. While the number of buy-to-let mortgages being taken out has risen substantially since the 2009 to 2010 slump, they running at less than half the level seen at the peak of the boom in 2007. The CML said that almost half of buy-to-let lending was currently remortgages and property investors now accounted for 13.4 per cent of outstanding mortgages in the UK. CML director g