Tsai has also refused to acknowledge the "1992 consensus" that there is only "one China" and that Taiwan forms part of it. Beijing say the principle forms the basis of any ties between the mainland and Taiwan.
Reaffirming that the new office complex is "a testament to the strong USA commitment to Taiwan", Moriarty said the us would continue its "abiding commitment to the Taiwan Relations Act" and "support Taiwan's ability to defend itself and to make positive contributions to the worldwide community". "The great story of Taiwan-US relations remains to be filled with the efforts of those that will one day occupy this building", Tsai added. The just-completed American Institute in Taiwan office in a suburb of the capital Taipei functions as Washington's de facto embassy in the absence of formal diplomatic relations.
"It represents much more than steel and glass and concrete", Royce said at the ceremony.
On Monday night, China's state-run tabloid Global Times published an editorial, suggesting Beijing should warn the U.S. and Taiwan of possible consequences for any provocative move.
Following the beginning performances, including a passionate percussion show and the solemn singing of America's national anthem, the officials on the main stage, one after another, gave their remarks that were heavily centered around promoting the relationship between Taiwan and the U.S.
Chinese Foreign Ministry spokesperson Geng Shuang said Beijing was "gravely concerned" with the inauguration of the building. Trump has previously vowed to honor Beijing's One China policy, but Washington's recent attempts to cozy up to Taiwan have undermined Beijing's confidence in his pledge.
In March, President Donald Trump signed the Taiwan Travel Act that encourages high-level visits between the two sides.
Taiwan also risks being sidelined in Washington if Trump feels satisfied that China has addressed its massive trade surplus with the US, said retired strategic studies professor Lin Chong-pin.
Meanwhile, the Beijing-based Global Times noted on the weekend that China had to be prepared for a crisis in the Taiwan Strait, following the conclusion of the island's annual anti-Chinese invasion drill, as well as a Reuters report that Washington could be considering sending a US Navy vessel through the strait.
Beijing has also increased the frequency of military exercises in the last few months, including deploying its own aircraft carrier, the Liaoning, in the Taiwan Strait.
Still, the United States has not sold F-35 fighter jets, as requested by Taipei, offered actual submarines or docked a naval vessel in Taiwan despite talk in Washington.