Question: Which architect was responsible for designing the building standing on the original site of a Spanish explorer, conquistador, and first Governor of Puerto Rico?

<P0-S0> The Anson Mills Building is a historic building located at 303 North Oregon Street in El Paso, Texas. <P0-S1>  The Building stands on the original site of the 1832 Ponce de León ranch. <P0-S2>  Anson Mills hired Henry C. Trost of the Trost & Trost architectural firm to design and construct the building. <P0-S3>  Trost was the area's foremost pioneer in the use of reinforced concrete. <P0-S4>  Built in 1910-1911, the building was only the second concrete-frame skyscraper in the United States and one of the largest all-concrete buildings. <P0-S5>  At 145 feet (44 m), the 12-story Mills Building was the tallest building in El Paso when completed. <P0-S6>  The architectural firm of Trost and Trost moved its offices to the building upon completion, where they remained until 1920. <P0-S7>  The Mills family sold the building in 1965. <P0-S8>  The building stands on a corner site opposite San Jacinto Plaza, with a gracefully curved street facade that wraps around the south and east sides. <P0-S9>  Like many of Trost's designs, the Anson Mills Building's overall form and strong verticality, as well as details of the ornamentation and cornice, are reminiscent of the Chicago School work of Louis Sullivan. <SEP> <P1-S0> Juan Ponce de León (] ; 1474 – July 1521) was a Spanish explorer and "conquistador". <P1-S1>  He became the first Governor of Puerto Rico by appointment of the Spanish crown. <P1-S2>  He led the first known European expedition to "La Florida", which he named during his first voyage to the area in 1513. <P1-S3>  Though in popular culture, he was supposedly searching for the Fountain of Youth, there is no contemporary evidence to support the story, which is likely a myth. <SEP> <P2-S0> After graduating with honors from Georgetown University’s School of Foreign Service and completing his juris doctor degree at Georgetown University Law Center in Washington, D.C., Mr. Rodríguez-Ema returned to Puerto Rico to work as an associate in the corporate and banking division of a major law firm in San Juan. <P2-S1>  He concentrated and focused his early legal career on the legal aspects of complex financial transactions for the law firm’s banking clients. <P2-S2>  He was later recruited by Drexel Burnham Lambert-Puerto Rico as a Vice President, later Senior Vice President, of their Corporate and Municipal Finance division. <P2-S3>  He was responsible for structuring and executing a variety of bond and note issues for the Government of Puerto Rico, its several dependencies, as well as for Drexel’s private clients. <P2-S4>  In 1989 Mr. Rodríguez-Ema was recruited by Chase Manhattan Bank in Puerto Rico to manage the investment banking unit of its Chase Securities Puerto Rico subsidiary, thus becoming a member of Chase’s Management Committee in Puerto Rico. <P2-S5>  After the November 1992 election, the governor-elect of Puerto Rico asked him to join his fiscal and financial team as President of the Government Development Bank for Puerto Rico (GDB). <P2-S6>  The GDB (www.gdb-pur.com) is the bank and fiscal agent for the government of Puerto Rico. <P2-S7>  As such, it is chartered with the coordination, structure, execution and placement of every single financing, bond or note issue for all government agencies, government-owned corporations and its multiple dependencies, including all 78 municipalities throughout Puerto Rico. <SEP> <P3-S0> Puerto Rican citizenship was first legislated by the United States Congress in Article 7 of the Foraker Act of 1900 and later recognized in the Constitution of Puerto Rico. <P3-S1>  Puerto Rican citizenship existed before the U.S. takeover of the islands of Puerto Rico and continued afterwards. <P3-S2>  Its affirmative standing was also recognized before and after the creation of the Commonwealth of Puerto Rico in 1952. <P3-S3>  Puerto Rican citizenship was recognized by the United States Congress in the early twentieth century and continues unchanged after the creation of the Commonwealth of Puerto Rico. <P3-S4>  The United States government also continues to recognize a Puerto Rican nationality. <P3-S5>  Puerto Rican citizenship is also recognized by the Spanish Government, which recognizes Puerto Ricans as a people with Puerto Rican, and not "American" citizenship. <P3-S6>  It also grants Spanish citizenship to Puerto Ricans on the basis of their Puerto Rican, not American, citizenship.