I have one like that. Except mine's not under ground, and usually the cars are concealed by big green tarps that blend in nicely with the landscape, and of course my cars aren't exotic.....wait, mine's not cool like that at all. Dangit!
seems like the guy has a bit more money than I do.
I think the only thing I saw that could afford may be one of the pictures
a friend of my dads has a building downtown that has a basement with freight elevator. upolstry shop on the first floor and car collection in the basement. most people dong even know its there.
I'd do that in a heartbeat if I could afford to!
However, I'd make the surface level part a single car garage (ok, maybe a double). All the neighbors see is me driving one car in & different one out for every day of the week.