Tax delinquent property has a profoundly negative effect on the market value of nearby homes, a new PlanPhilly / Inquirer analysis has found. In all, tax delinquency diminishes the overall tax base by a minimum of $9.5 billion. The average single family home in Philadelphia is worth 22.8 percent less, due to nearby delinquencies. That figure varies dramatically from house to house, depending on how many delinquent properties are within 500 feet.
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