Why is the garage on top?

because they have a flying car

naw this ain't no garage, its a drive-by movie theatre😁.

Yeah it looks like an old drive-in movie theater. I went to one as a kid in the 1980's because the town I'm in still used it but it became a grounds for flea markets in the '90's

Bro this is not a garage, thats a fighter jets uhh

Reasonable Crashout

My guess is that, when the house was built, it was a farming place and that garage door had a pulley system on it to easily transport hay bales to the top floor.

Yeah that is likely why

How? They must've had a blueprint and everything!

Where they're going, they won't need roads.