After a pilot jumbo mortgage loan program between the Federal Home Loan Bank of Chicago and Redwood Trust kicked off this quarter and expanded into a full roll-out beginning June 1, it was announced this week that the loan limit will just about double. The new single-family loan limit for the Mortgage Partnership Finance Direct program will increase from the current $729,750 to $1.5 million in the third quarter. The MPF Direct loan limit was raised primarily to help members that operate in urban or other areas where home prices are higher than the national average, said John Stocchetti, an executive vice president at the FHLB Chicago and group head of the MPF program.