A few days ago I posted a link to a blog called Boudicca's Voice. The author's father was assigned to USTDC and the family lived in the Taipei area up to the time of the US withdrawal.
In one of her emails to me, she mentioned a Chinese restaurant in the east compound. She thought it was behind the theater and that it was called the China Pavilion.
I don't remember the place at all but I'm wondering if it was the building labeled "Mess Hall" (building 709) in this page from the Taiwan Report: