The mansion rests amid a private acre of mature trees, lush gardens, colorful tree roses, verdant manicured lawns and a formal fountain. An expansive verandah surrounds three sides of the mansion. Churchill Manor is a magnificent three-story mansion built in 1889 and is listed on the National Register of Historic Places. Encompassing nearly 10,000 square feet and reputed to be the largest home of its time built in the Napa Valley, this storybook mansion is the legacy of wealthy businessman Edward S. Churchill, one of Napa's original founders. FACTS: 10 Guest Rooms, Meeting Maximum 30, Banquet Maximum 150 Outdoors.