Requirements: 5 sided foundation, 2 ft. cantilever of second floor, 2 ft. cantilever of roof, 100 sqft. floor space on second floor, at least 1 continuous exterior wall extending from foundation to roof, roof must be a ruled surface.

Solution: Parti is a smaller square rotated 45 degrees within a larger Square. Each exterior wall has a different condition to meet the various requirements (continuous wall, wall with 2nd floor canitlever, wall with roof cantilever, wall with ruled surface). Second floor is constructed with removable floor panels. When floor panels are closed, overall sqft equals 100.