This 5,000sqft high end residence on Mulholland drive (near the skirball cultural center) in Los Angeles is located on a steep hillside with stunning views of Griffith Park, the Hollywood sign, and downtown Los Angeles. The design concept is a continuation of the prefab system developed for the ADU design ”E-pop”. This bigger brother version relies on the same principals which are large monocoque components that are both enclosure and structure. Manufactured and finished offsite they can be erected quickly and create an instant enclosure that is then infilled with glazing and openings. The design is inspired by a monolithic metal crystal that has been cracked open to reveal its interiority. It produces an architecture that is both open and mysterious and only slowly reveals itself as one moves around the building. From the street it appears private and opaque while when you are inside it opens up to the landmarks around it. Accessible only through the Batcave - a lobby and garage cut into the hill - its is connected to the street only by an elevator and an internal staircase.