US mortgage rates dropped last week by the most since February. That's according to data from the Mortgage Bankers Association. The rate on the 15-year mortgage fell below 6% for the first time in four months, matching its lowest level since October.The news comes as government data showed shelter costs continued to decelerate in July, though they still outpace overall inflation. Joining me now, Danielle Hail, Realtor. com chief economist and Yahoo Finance senior housing reporter, Claire Boston.Before we so ...