Many brokers thrived last year amid record home sales, but this year the industry has taken a turn for the worse. TAMPA — The sneeze came first: Home sales in the Tampa Bay area dropped by a third from last year’s peak. For symptoms of the developing head cold, plunge into the exhibition hall at the Tampa Convention Center, where the Florida Association of Mortgage Brokers is holding its annual trade show. Puffed up to handle record-breaking home sales of last year, which poured money into savvy brokers’ pockets, the residential lending industry and affiliated businesses are mostly deflating this...