Is it possible to find the registered owner of a car, using just the license plate number, and make and model of the car?

My mom has Alzheimer’s, and some months back she let a guy park his car in her empty carport at her condo complex. (It’s a very large condo complex, so there are hundreds of people, and there are thousands of people in the entire retirement community.) She can’t remember who the guy was. It’s a very expensive car that he must not drive very much because he keeps a car cover over it, and we’ve never seen him, or seen him drive it. Probably just a toy to him.

But my siblings and I are not comfortable with the possible liability issues, and we would like to talk to him.