That means the Park District — you, taxpayers — will have to come up with reimbursements for workers’ higher contributions, plus interest. Going forward the district will have to figure out how to stabilize the retirement fund without those cost-saving changes. Chicago’s pension funds — for municipal workers and laborers, teachers, police and firefighters, and now Park District employees — face serious unfunded liabilities. The Civic Federation estimates the Park District fund has about 39 percent of what it needs to make future benefits payments.