In just one hour of fact-checking the Revenue Department's delinquency list, my office found numerous historical churches, a Head Start preschool playground, land owned by our four largest universities, and cemeteries that are exempt from property taxes and should never be seized for delinquency. We also found that the city has filed numerous tax liens against itself. We cannot in good conscience authorize a mass lien sale and shift the burden of correcting errors in our own data onto innocent homeowners or nonprofit institutions.