Hamilton County taxpayers are on the hook for an expensive contract obligation. The county is paying legal expenses of the architect for the Cincinnati Bengals' stadium -- even while the county is suing the architect to try and recover cost overruns. County officials said payment of the expenses for Los Angeles-based NBBJ Architecture is contractually required. Hamioton County hired the firm to design the 458 (m) million-dollar Paul Brown Stadium, which opened in 2000. The Bengals lease the county-owned stadium. The county is demanding that NBBJ pay it 45 (m) million dollars in what county officials contend are stadium cost overruns for which the firm is liable. NBBJ says it isn't liable. The county is paying the firm's legal defense costs under terms of an insurance policy the county bought when it hired NBBJ to design the stadium.