By STACEY GROSS sgross@timesobserver.com If you’re hoping to avoid having a property sold at upset, today’s the last day to pay those back taxes. The Warren County Tax Claim Bureau participates in three separate sales of real estate each year to deal with delinquent taxes throughout the county. The first is the Upset Sale, which is scheduled for 1 p.m. Monday, Sept. 24, in the main courtroom of the Warren County Courthouse. Upset is the first sale a property must go through, where any property with two or more years of delinquent taxes are auctioned off for the total ...