Perched on a mesa in Boulder, Colorado this home incorporates an "upside" down floor plan, with the great room and master suite on the second floor, expanding views to the south. Utilizing the footprint of the existing home, this rebuild and second floor addition adds square footage while reducing the home's total energy demand. Built for a multiple generations, the home includes separate living spaces for children, parents and grandparents. A rotated second floor plan, cladded with a beetle kill pine rainscreen, is design to optimize southern exposure while capturing local mountain views. A double-stud wall assembly and triple pane Zola European Windows create a super-insulated envelope, heated and cooled by a geothermal ground source heat pump that is powered by a 10 kw PV system.