Hagy Belzberg has been responsible for some of Los Angeles’s most arresting public spaces, from the deeply affecting Museum of the Holocaust to the refreshingly contemporary Patina restaurant at the Walt Disney Concert Hall. With his latest endeavor, however, the architect has taken a more private approach. The 1-acre residential compound, which Belzberg’s Santa Monica, Calif.–based firm completed in July, is located at 1232 Sunset Plaza Drive, just above the bustling Sunset Strip, but its mountainside perch a…