By 1926, Dr. Samuel Ball had purchased the hotel, added the five-story central stone section, and had enlarged the original Castle Rock structure to five stories. Dr. Samuel Ball came to Excelsior Springs in 1918, and opened his private practice by purchasing the 12-room cottage that was located on the old Ball Clinic and Bathhouse grounds.

The remnants of the stone pavilion for Link's Soda and Sulpho Salt well remains east of the hotel. Originally a brick structure enclosed the wells. This was razed and the partially extant stone pavilion was built. What remains today is a circular balustrade of square-cut, random ashlar, quarry-faced limestone. There are four openings which have concrete sidewalks and steps leading from them. Flanking the entry are stone piers. In the center, a circular well has been covered.