According to the city's court filing, if it is allowed to join the suit Wilmington will seek a judge's declaration of the New Castle County assessment system as unconstitutional, and an order for the county to immediately perform a reassessment.

Wilmington officials have asked to join the civil rights groups suing Delaware for underfunding educational services for students with disabilities, students from low-income families and English Language Learners. Part of the lawsuit involves how counties calculate property taxes, which contribute to school funding. Wilmington hopes to force New Castle County to update its property tax assessments for the first time in 35 years, claiming the current system imposes excessive costs on city residents.