The Great Petaluma Mill was built 156 years ago, just two years after Petaluma was founded. It has served many purposes over the years and today it houses numerous stores, hair salons, a restaurant and a coffee shop. The Great Petaluma Mill is located immediately next to the Petaluma River and the coffee shop provides outdoor river-front seating. The Petaluma Chamber of Commerce and 24-Hour Fitness utilize the two largest areas here.