There's an outer shell for the house, that has a bunch of flat solar panels on the roof. The entire shell is moved to change the pitch of the panels. Placing the panels on gimbals (as is usual) would require less power, less time, be easier to repair, and safer.
The entire building then rotates so that the floor to ceiling glass wall in the front tracks the sun for warmth. That's at least partially needed because of the giant outer shell being designed such that it blocks the other three walls, so they can't let sun in to heat the room.
Then you lose realestate because the building is rectangular, but rotates. If the building was circular, with glass right the way around, you'd have a more effective use of space, and wouldn't require heavy mechanics and engineering needed to support a moving building. (Of course you wouldn't get press for making a round glass building with solar panels on the roof, as that's already been done at quite a large scale :D )