Do as they do in Japan. Dig deep, and have an entrance that looks like a single car garage, with an underground robotic silo that'll hold as many cars as you've

Do as they do in Japan. Dig deep, and have an entrance that looks like a single car garage, with an underground robotic silo that'll hold as many cars as you've allowed it to. They're pretty ubiquitous in Tokyo and dense areas of other cities. A better solution is not to have cars in the first place.