Monolithic’s Oberon Four-plex The Oberon Four-Plex — It’s a Monolithic Dome that is an oblate ellipse, with a diameter of 32 feet and a height of 12 feet. Four in One — Monolithic’s Four-Plex encompasses four, separate apartments. Designed for one-person occupancy — The living area’s 201 square feet can be compared to a large, double motel room. Kitchen — It includes a refrigerator, stove, microwave and cabinets. Compact and Cozy — Each apartment includes a small dining area. Sleeping Area — It’s furnished with a single bed or fold-out couch and a closet. Double Duty — The bed provides seating. Bathroom — Each unit includes a bathroom with toilet, shower and pocket door.