Industry groups are ramping up efforts to extend conforming loan limits currently available in high-cost markets that are set to expire at the end of the month, focusing their lobbying efforts on appropriations legislation in the House. The National Association of Realtors and the National Association of Home Builders are dou-bling their efforts to persuade Congress to extend current limits for Fannie Mae, Freddie Mac and the FHA, which top out at $729,750 for single-family units in the lower 48. Barring legislative action, the top loan limit will drop to $625,500 on Oct. 1. In addition to the lower ceiling, loan limits in most high-cost markets will...