"Yep. I wonder how/why they impounded his car. Since it was in a parking lot it doesn't sound like he was using the car in the commission of a crime."
I have no idea.
My guess would be - some jurisdictions fight prostitution not only by arresting the "john" but by taking his car away from him, since that's what he went cruising in for the purpose of finding a hooker. That might be what happened here.