Julian Schnabel’s first major West Coast show in 30 years, which opened on Thursday at the Legion of Honor in San Francisco, begins outside the building, with a site-specific installation of six new monumentally sized abstract paintings. Each measuring 24 feet square, they are on display in the museum’s open-air courtyard alongside three of Schnabel’s sculptures from 1982 and a permanent museum resident, Rodin’s Thinker. The overall effect transforms the quintessential Neo-Classical structure into a work of contemporary art itself.