The former mayor has been expected to be a key witness for the owners, an investment group granted the deal to run Park Grill in 2003. They argue the Daley administration knew full well all the details of the contract and say they were taking a risk signing on to run the restaurant so soon after Sept. 11, 2001, when there was no guarantee of success in a down economy. Attorneys for the Park Grill argue the city simply wants a "do-over" to get better terms.