WALNUT GROVE — A touch of Italy served with a romantic Sunday brunch awaits those venturing into heart of the Delta at the Grand Island Mansion. The unique and historic 58-room Italian Renaissance villa is part of the largest private estate in Northern California. The four-story, 24,000-square-foot villa was built by European craftsmen in 1917 for Louis Meyers and his wife Audrey, daughter of Lubin of the Weinstocks Lubin department stores.