1960s1970s : Lin continued to expand his firm 's specialty in prestressed concrete to broader consulting services , with projects that included conventionally reinforced concrete , structural steel , masonry , and timber-framed structures . In 1967 , he designed the 18-story shear wall Bank of America building in Managua , Nicaragua . The reinforced concrete tower was one of only two structures left standing after the country 's 1972 earthquake . Lin also became known for his design innovations , such as the Rio Colorado Bridge , an upside-down suspension bridge spanning a deep gorge in Costa Rica . In the early '70s , the firm also established offices in Taiwan and Singapore
1972 earthquake
1972 Nicaragua earthquake
T. Y. Lin International