It will take about five years for the new common mortgage securitization platform being developed by Fannie Mae and Freddie Mac to become fully functional, according to Edward DeMarco, acting director of the Federal Housing Finance Agency.Testifying before the House Financial Services Committee, DeMarco explained that the plan for a single MBS platform that would be run by a new government entity separate from Fannie and Freddie “does not mean we are consolidating the companies.” The platform would have its own CEO and chairman and office space separate from the two government-sponsored enterprises. It could, in time, be sold to the private sector, he said.