In La Jolla, California, a 5,000 square-foot lot can be prohibitively small for contemporary architecture. Most of the plots in the Lower Hermosa neighborhood span 10- to 20,000 square feet, but this sliver of a lot showed plenty of potential to this architect. The Cresta House by Jonathan Segal occupies most of its lot with concrete forms, providing more usable space than the lot itself provides for.
The Cresta House by Jonathan Segal measures 5,300 square feet in total, split among three levels that use less space than they appear to. The shell of the Cresta House is a large rectangular box, open on the sides and top to partially cover the exterior patio area. This makes the house feel larger than it is– the design suggests that the courtyard patio is part of the interior thanks to a corner column and roof element.

Article from : http://www.thecoolist.com/cresta-house-jonathan-segal/