The Mission Inn, now known as The Mission Inn Hotel & Spa, is a historic landmark hotel in downtown Riverside, California. Although a composite of many architectural styles, it is generally considered the largest Mission Revival Style building in the United States. Mission Inn Hotel & Spa is a member of Historic Hotels of America, the official program of the National Trust for Historic Preservation.The owners are Duane and Kelly Roberts. Kelly serves as Vice Chairman and Chief Operating Officer (COO) of the Mission Inn, overseeing its daily operations.