The new principal-reduction option for Fannie Mae and Freddie Mac loan modifications could end up affecting only about 6,000 delinquent borrowers, according to an Urban Institute analysis. The Federal Housing Finance Agency late last week announced that the government-sponsored enterprises would do principal writedowns for a small population of distressed borrowers. The program is limited to loans that were seriously delinquent as of March 31, had loan amounts of less than $250,000 and unpaid debt, including arrearages, exceeding 115 percent of the current market value of the home. The FHFA estimated...