Cook County property tax delays hit Evanston, other schoolsCook County’s delayed property tax bills are straining school districts with nearly $122 million in unexpected, unneeded costs. Cook County’s months-long property tax billing delay is straining suburban school districts that rely on timely tax distributions to fund day-to-day operations, tallying nearly $122 million in borrowing costs. Cook County property tax bills were delayed by nearly four months, with county leaders blaming a 10-year-old contract with a Texas-based company called Tyler Technologies. Cook County property tax bills have climbed 78% since 2007, even as median property values rose just 7.3%. But for schools in District 65, that additional delay may require even more borrowing and extra costs for taxpayers.