Kartheiser’s private courtyard includes a covered seating area and fire pit, designed by Roberts.
The structures were designed by Cal State Polytechnic University, Pomona, students.
The site needed a path that would let residents easily ascend from the bank to the house.
Kartheiser's courtyard also includes a dry sauna with a ceiling made from 2,500 pieces of wood.
The hideaway grows darker as residents move through the space toward the bedroom.