In 2004, the tech entrepreneur Kumar Malavalli bought two adjacent lots in Los Altos Hills in Silicon Valley, Calif., for his wife Vijaya and him to build their dream home at 27500 La Vida Real. The couple took years perfecting the plans, which yielded a 20,400-square-foot main home brimming with skylights and spacious, open living areas. The home exudes an organic quality, with curved walls and artfully placed wood paneling on ceilings and walls. A central courtyard ensures that every room can access the…