The Federal Housing Finance Agency should direct Fannie Mae to strengthen its control over the GSE’s short sales, and review Fannie’s Streamlined Documentation Program to determine whether it should be available to borrowers seeking approval to short sell non-owner-occupied properties, according to the agency’s official watchdog. The audit released this week by the FHFA’s Office of Inspector General was based on a review of 41 short-sale transactions involving multiple Fannie servicers.