David S. Castle, who practiced in Abilene from 1914 to 1956, dominated the architectural scene not just in Abilene, but throughout the Plains and Panhandle regions. His seven-story Alexander Building was the first “skyscraper” in Abilene. The Alexander is classically ordered in three parts with a tall one-story limestone base, five stories of buff brick with unframed windows, and a stone-clad cornice. The wall surfaces are smooth, without pilasters, and ornamental detailing in the stone at the first and seventh floors has a Prairie Style flavor evident in other Castle works. Physician James M. Alexander settled in Abilene in 1889 at age twenty-two and established the Alexander Sanitarium (no longer extant), the first hospital between Fort Worth and El Paso. His prominence attracted professionals such as physicians and attorneys to his building.