Although it received barely any mention during the lengthy markup of GSE reform legislation in the House Financial Services Committee last week, a plan to expand the territory eligible for “high cost” Fannie/Freddie loan limits could have a significant impact on the mortgage business. Under the legislation approved by the committee by a lopsided 65-5 vote, the new federal regulator overseeing Fannie Mae, Freddie Mac and the Federal Home Loan Banks could designate high-cost housing…