Steve Harney has some advice for homeowners sitting on the sidelines: sell. That, the real estate consultant says, is because prices may go down 5 percent to 8 percent as banks unload a glut of repossessed properties. Harvey told a crowd of real estate agents in Naperville, Illinois that the number of houses banks took back in August was up 49 percent over the year before, and September was the greatest month in history for repossessions. Harney’s advice was printed January 2 in the Chicago Tribune.