We have upstairs three rooms, each inordinately large: a bathroom, walk-in closet, and bedroom. They are what I would consider artifacts, which I define as something unintended and left over from other intended activities. This house in original from was much like a toaster, two floors, small footprint, and by world standards fully adequate for its intended purpose.
The former owners, however, wanted something bigger and better. They did not want this in order to live in a bigger house – they wanted to be able to sell it so that they could buy a place with land. The woman who was partnered with a man in the construction business wanted to raise horses, utterly impossible here, as it is a steep wooded hillside. So they popped out the north side of the building, and doubled the size of the structure, creating a lovely living and dining area, and two “offices” on our main floor, each qualifying as a bedroom were it to be used for that purpose. In the basement, they created two large areas of no particular purpose, and two small rooms, one qualifying as a bedroom, the other not (no closet).