Ames engaged in manufacturing; served as a member of the common council of Lowell in 1896; like his father, he re-joined the Army during the Spanish–American War and was commissioned lieutenant and adjutant of the Sixth Regiment, Massachusetts Volunteer Infantry; appointed acting engineer officer of the Second Army Corps under General Graham, in addition to his duties as adjutant. He was promoted to lieutenant colonel in August 1898; served as civil administrator of the Arecibo district of Puerto Rico until November 1898.
Ames became a member of the Massachusetts House of Representatives 1897–1899; elected as a Republican to the Fifty-eighth and to the four succeeding Congresses (March 4, 1903 – March 3, 1913); was not a candidate for renomination in 1912; resumed manufacturing pursuits; president of United States Cartridge Company, and treasurer of Heinze Electrical Co. of Lowell; at time of death was treasurer and a director of Wamesit Power Co. of Lowell, Massachusetts; director of Union Land and Grazing Co., Colorado Springs, Colorado, and vice president and a director of Ames Textile in Lowell.[2]
Ames was completely taken with Villa del Balbianello when he visited Europe for the first time in 1911, and he determined to purchase the Villa. Ames almost lost the Villa to Prince Eithel-Friedrich, the Kaiser's youngest son, in 1914. The Villa did not sell to Eithel-Friedrich due to an Italian law stating that as the Villa was one of the art monuments of Italy, they had the right to be the preferred purchaser at that price. Ames won his battle in 1919, beautifully restoring the Villa. On a Dictaphone Tape he tells the story (also a short autobiography). The Tape was transcribed, and his greater family published it in book form: "Butler Ames and the Villa Balbianello, Lake Como, Italy, An American Oral History." Essays and introductions by Evelyn Ames, Pauline Ames Plimpton, Ezio Antonini, Sarah and George Plimpton plus period photographs and the illustrated Guest Book 1920 to 1970 was added. The book was edited by Oakes Plimpton and printed by Hobblebush Press, 2009, available through Amazon Books or Oakes Plimpton, 67 Coolidge Road, Arlington, MA 02476.
Ames died in Tewksbury, Massachusetts, in 1954, at the age of 83. He is buried, along with his father, grandfather and extended family, in the Hildreth family cemetery, behind the main cemetery on Hildreth Street in Lowell.
His heirs sold Villa del Balbianello in 1974 to Guido Monzino.[3]