Officers responded to the Applebee's on Fresno Street and Friant Avenue around 10:30 pm on Tuesday.
They found a man in his 40s with injuries to his head and body.
The victim was taken to a hospital and is expected to recover.
A parked car that appeared to have been hit by another vehicle was also found in the parking lot.
Investigators say they're now searching for the driver of a silver Audi who left the scene after the crash.
The cause of the crash is under investigation.