In some areas of NYC, there are houses that are mirrored copies of the one next to it. They share a common wall area (sometimes its 2 walls side by side as 1) between the two, and along that wall, one house is a mirror copy of the one next to it. If the original has a set of stairs to the left, the mirrored house would have a set of stairs to the right, and so on.

Any way to grab a whole house or floors of a house and mirror flip it? I tried grouping but that only works on furniture, windows and doors, not walls or rooms.

Thanks for the help!