This spacious 48-by-60-foot Monitor Barn serves as an equipment storage building but quickly transforms into an unforgettable event venue for gatherings of up to 200 guests. Set high on Sonoma Mountain, it offers sweeping views across the vineyard and valley—from the Petaluma River winding its way toward San Pablo Bay to Mount Tamalpais in the distance beyond. Featuring cathedral ceilings with soaring king trusses and eight double doors that open wide to create an airy, open-pavilion feel that brings the beauty of the landscape indoors (views shown here are simulated).