Mather finally visited the monument on March 28, 1924. A further proclamation, this time by Calvin Coolidge, enlarged the monument on July 2, 1924, securing water sources and campsites, was followed by a directive for a complete survey of the now- monument. Following a visit by NPS assistant director Horace M. Albright, money was appropriated to build a ranger's cabin, completed in 1929, while facilities within the caves were improved. Frank A. Kittredge, the Park Service chief of engineering, and Thomas Chalmers Vint, Park Service landscape architect, conducted a survey for a five-year improvement plan in 1927. In 1929, condemnation proceedings were filed against private landowners in and around the park, including the mining company, seeking . An expansion proclamation by President Herbert Hoover in 1931 added of land donated by San Benito County. Trail building was expanded in the early 1930s, including a tunnel for the High Peaks Trail.