We have partners coming to Chicago and need to meet them. Since they have requested a Nissan car, we are now looking for a rental option. What do you recommend?

It is strange of course that they are ordering you a car. But if the partners want it so much, you should do everything to make them satisfied. It is not difficult to rental a Nissan GTR in Chicago. Just follow the link https://getrentacar.com/en-US/car-rental/5017752 This company has not a bad fleet of cars, excellent service and reasonable cost.