A real risk for the economy in 2010: the more than half of the $3.4 trillion outstanding commercial real estate loans, many of which will be souring in the coming year. A rerun of what happened in the residential mortgage is expected. A Fed document prepared by the Fed's Rapid Response program and presented Sept 29 by K.C. Conway points to the dangers to bank's with heavy commercial real estate exposure. THis will further constrict lending as banks fold and remaining banks are forced to set aside money for additional losses. At this time banks are simply extending the loans and paying the interest on these loans to themselves. A study of regulatory filings of 800 banks by the WSJ shows that banks with large exposure have set aside only 38 cents in reserves in the second quarter for every $1 in bad loans, a decline from $1.58 in reserves for every $1 of bad loans from the beginning of 2007. Conway's report presents ableak picture for 2010, with commercial real estate losses for warehouses, apartment buildings and office buildings reaching 45%....