Agreste Mansion's Garage
I’m not aware that anyone has noticed, or pointed this out yet, but the Agreste’s do in fact have a garage attached to their house.
It is at the ground level, bottom right, under the dining room windows.
Here we seen a small corner from behind the wall.
In a quick screenshot of Bubbler, the garage door is more visible from within the courtyard.
Even though it is almost unnoticeable, and not in a place typically expected, it makes sense for them to have one. It is only large enough for a single vehicle, and must be the place where their private car is kept when the Gorilla isn’t driving it.