The high watermark in the Sino-American relationship during the Henry Kissinger era came in 1973 with the creation of “liaison offices,” or de facto embassies, in each capital: These liaison offices further deepened and formalized the diplomatic relationship after the Richard Nixon–Mao Zedong summit of 1972 and would remain the closest that the two governments would come to establishing official diplomatic relations before Kissinger left government in January 1977. This chapter reveals that – in cause, conception, and execution – liaison offices were a direct outgrowth of the exchange relationship. Other new milestones in that relationship were also set in 1973, not least during the visit of the largest cultural delegation yet to travel to the People’s Republic of China: the Philadelphia Orchestra. However, 1973 also saw the first signs of new tensions in exchange diplomacy as lingering Sino-American disagreements about Cambodia and Taiwan, as well as turbulent Chinese domestic politics, led to confrontations in cultural contacts and during a Congressional delegation to China led by Senator Warren Magnuson.