WALNUT GROVE — Want a romantic Sunday brunch with a touch of Italy?Look no further than 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 in 1917 for Louis Meyers and his wife Audrey, daughter of Lubin of the Weinstocks Lubin department stores.