I would love to have underground parking!
It would be great for cities because parking currently takes up a lot of valuable space amd I want to make a suoer condensed city!
We could have a small entrance above ground while the actual parking area is underground, allowing us to build more densely without using up lots of land for parking and also have it connected to malls and stuff which would be fun to have and other places like aquariums or airports!

Recommend using the Parking Garage!
