The United States on Tuesday unveiled a new $255 million de facto embassy in Taiwan in what was praised as a "milestone" in relations, as the self-ruled island comes under increasing pressure from China.
Donald Trump's government is moving to strengthen ties with Taiwan in the face of China's diplomatic moves and military threats.
In March, after Mr Trump approved new rules allowing top US officials to travel to the island, Beijing called on Washington to "correct its mistake".
But the US sent an assistant secretary of state for the unveiling, a visit less likely to unnerve China, which was concerned that higher-level officials might attend.
The US switched diplomatic recognition to China in 1979 while it maintained close economic, political and security ties with Taiwan. It manages its relations through the American Institute in Taiwan.
Marie Royce, assistant secretary of state for educational and cultural affairs, attended the dedication ceremony with Taiwan's President Tsai Ing-wen.
"Ait's new home is both a tangible symbol that reflects the strength of our ties and a state-of-the-art facility that will make possible even greater co-operation for years to come," said Mrs Royce, the wife of pro-Taiwan congressman and House foreign affairs committee chairman Ed Royce.
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Ait chairman James Moriarty called the new complex a "milestone" in the US-Taiwan relationship and a "testament to the strong US commitment to Taiwan".
Ms Tsai praised the complex as a new chapter in the "great story of US-Taiwan relations".
China and Taiwan have been ruled separately since 1949, but Beijing views the island as a renegade province awaiting reunification, by force if necessary.
It bars Taiwan from membership in the United Nations and many other international organisations, and has been luring away the island's remaining diplomatic allies.
Since Ms Tsai came to power two years ago, Beijing has cut contact with her government because Taipei refuses to acknowledge that Taiwan is part of "one China".
Beijing officials have described intensified Chinese military manoeuvres near the island as a warning against any move to assert its sovereignty.
While Taiwan's relationship with the US is essential to its security, it must also guard against provoking China, which is its biggest military threat but also the dominant market for the island's export-driven economy.