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In late 1903, Trost moved with his sister and nephew to join his brother Gustavus Alolphus Trost in El Paso, who had been there since 1902. Henry and Gustavus opened the architectural firm of Trost & Trost. Gustavus Alolphus’s twin, named Alolphus Gustavus, joined the firm in 1908 as a structural engineer. Another sister, Matilda later joined them in El Paso. The firm enjoyed instant success, with Henry designing large and small buildings, homes, churches, commercial and public buildings, and pioneering the use of steel‑reinforced concrete. Trost built El Paso’s first skyscrapers and large downtown buildings. Download the Official Visit El Paso App for the audio version of this tour.